The Universal Calculation Engine
The Universal Calculation Engine
Math & Engineering Calculators

Use these calculators for math, health, and everyday life. Math covers basic and scientific calculator, percentage, average, fraction, statistics, probability, number calculators, geometry, and algebra. Architecture, Construction, HVAC, and Plumbing offer trade and building calculators. Health covers BMI, BMR, calorie, fitness, pregnancy, and lifestyle. Calculators & Daily includes date & time, travel, outdoors, kitchen, school, size converters, and random generators. Energy, Solar, Electrical, Mechanical, and Science & Engineering cover power, solar, and technical calculations. Search or pick a category below to start.

Tools by category

Basic Calculator
Basic arithmetic • send result to unit converter
0
History
No calculations yet
Scientific Calculator
Trig, logarithms, powers, constants

Scientific mode is available inside the Calculator. Toggle it with the Scientific button above the keypad.

Programmer Calculator
Hex, binary, octal, decimal • bitwise • shifts • word size
0
0
HEX: 0000 0000
DEC: 0
OCT: 000 000 000 00
BIN: 0000 0000 0000 0000 0000 0000 0000 0000
Signed: 0
Bit view · click to toggle
BASE:
WORD SIZE:
|

What it does

  • Work with numbers in hex, decimal, octal, and binary and perform bitwise and arithmetic operations for programming and low-level work.
  • Choose an input base (Dec, Hex, Bin, Oct) and word size (8/16/32/64-bit); the value updates in all bases. Use the bit grid to toggle bits or the keypad for digits and operators.
  • Supports arithmetic (+, −, ×, ÷, mod), bitwise (AND, OR, XOR, NOT), shifts, rotations, and unary ops so you can match common integer types and workflows.

FAQ

What is a programmer calculator?

A calculator that works in hex, binary, and octal as well as decimal, and supports bitwise and shift operations used in programming.

What are the number bases used for?

Decimal is everyday numbers; hex and binary are common in code (addresses, masks, flags); octal appears in some file permissions and legacy systems.

What does word size do?

Word size (8, 16, 32, 64 bits) limits the value range and how results are displayed, matching common integer types (e.g. uint32_t, int64_t).

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The tools and simulations on Calciverse are provided for informational and educational purposes only and should not be considered financial, investment, tax, or legal advice. Results are estimates based on user inputs and assumptions and may not reflect real-world outcomes. Users should consult qualified financial, tax, or legal professionals before making any financial decisions. Use of Calciverse is at your own risk.

Percentage Calculator
Common phrases, percentage difference, and increase/decrease by percent.
What is X% of Y?
Result
—
Formula: Result = (X/100) × Y
X is what % of Y?
Percentage
—
Formula: Result = (X / Y) × 100
Percentage Change (X → Y)
Change
—
Type
—
Formula: Change % = ((Y − X) / X) × 100
X is Y% of what?
Whole
—
Formula: Whole = X / (Y/100)
Percentage Difference
Difference
—
Increase or Decrease by Percent
Result
—
Percent Error
Percent Error
—
Formula: Percent Error = |measured − accepted| / |accepted| × 100
Fraction Calculator
Add, subtract, multiply, divide fractions; simplify; convert between decimal and fraction.
Fraction
—
Decimal
—
Mixed number
—
Statistics Calculator
Mean, median, mode, standard deviation & more
Area & Volume
Geometric area and volume by shape. Select a shape, enter values, then click Calculate.
Result
—
Surface Area
Surface area of sphere, cone, cube, cylinder, prism, capsule, cap, frustum, ellipsoid, pyramid. Same unit for all dimensions.
Formula
Surface Area
—
Average Calculator
Mean, weighted average, and rolling totals
Lorem Ipsum Generator
Generate placeholder text — words, sentences, or paragraphs
Home & Rent Affordability
Big financial decisions — how much house or rent you can afford: income and debt → max home price or max monthly rent. Combines house affordability, rent affordability, and DTI.
Affordability type
Income & debt
Loan & costs
DTI rule
Reverse: target home price
Comparison
Price tiers
Monthly payment at max price
Required income (target price)
Financial health
Approval strength
Lifestyle impact
Down payment
Income comparison
Budget breakdown
Loan & Mortgage
Big financial decisions — conventional, FHA & VA loans with taxes, insurance, PMI/MIP, payoff, refinance and APR views.
1) Property & Loan Basics
2) Program-specific
Conventional — PMI
3) Closing Costs & Cash-to-Close
4) Monthly Ownership Costs
5) Payment Strategy
6) Scenario Settings

Show amounts as:
A) Real Monthly Cost

Payment breakdown
B) Program Cost Impact

C) Cash to Close

D) Loan Summary & Payoff

E) Amortization & Milestones

F) Extra Payments & Biweekly

G) Equity Projection

Chart
Balance & payments over time
Formula: PMT = P × (r(1+r)^n) / ((1+r)^n − 1); r = annual rate/12, n = months
Tip Calculator
Split bills and calculate tips
Bill vs Tip
Discount Calculator
Find sale price, savings, and effective discount for single or stacked discounts.
Tip: Enter one discount for a single sale, or multiple comma-separated discounts for stacked discounting.
Find Discount % from Prices
Home Equity & HELOC
Big financial decisions — available equity, Home Equity Loan vs HELOC comparison, costs over time, stress tests, and a clear recommendation.
Your home
Home Equity Loan
HELOC
Best loan payment plan
HELOC draw & repayment
Total cost over time
Net cash & equity
Payment stress test
HELOC sensitivity
Equity vs loan balance
Payment timeline
Recommendation
Rent vs Buy
Big financial decisions — compare average monthly cost of buying vs renting over 1–30 years; break-even and chart
Home purchase
Home rent
Your info
Chart
Average cost by stay length
Staying LengthAverage Buying CostAverage Renting Cost
MonthlyAnnualMonthlyAnnual
Assumptions: fixed-rate fully amortizing mortgage with level payments; investment return is applied to upfront cash as annual compound growth; property tax and insurance grow using the inputs above; tax savings are approximated as (mortgage interest + property tax) × (federal + state marginal rate).
Unit Price
Compare price per unit (e.g. $/oz, $/kg)
Trip Cost Calculator
Trip cost, fuel needed, or MPG from distance and fuel used. Use for drive planning and travel budgets.
Meeting Cost Calculator
Estimate the cost of a meeting from attendees, average hourly rate, and duration.
Speed Calculator
Distance and time → speed; or speed and time → distance
Engine Horsepower Calculator
Estimate vehicle HP from weight and 1/4‑mile trap speed (elapsed time optional)
Rounding
Round to N decimal places or significant figures
Scientific Notation Calculator
Convert between decimal and scientific notation
Big Number Calculator
Add, subtract, multiply, divide large integers (beyond normal precision)
Result
—
Half-Life Calculator
Decay: N = N₀ × 0.5^(t / t½). Enter any three to find the fourth.
Formula: N = N₀ × 0.5^(t / t½)
Slope Calculator
Slope and line equation from two points
Formula: m = (y₂ − y₁) / (x₂ − x₁); line: y = mx + b
Distance Calculator
Distance between two points (2D, 3D, or latitude/longitude on Earth)
Point 1:
Point 2:
Distance
—
Formula: d = √((x₂−x₁)² + (y₂−y₁)²) [add +(z₂−z₁)² for 3D]
Matrix Calculator (2×2)
Determinant, inverse, multiply two 2×2 matrices
Formula: det = a₁₁a₂₂ − a₁₂a₂₁; A⁻¹ = (1/det)×adj(A); C = A×B
Number Sequence Calculator
Analyze a list, or compute Arithmetic / Geometric / Fibonacci
Sample Size Calculator
Find sample size n or margin of error E for proportion
Formula: n = z²×p(1−p)/E²; with finite population N: n = n∞/(1+(n∞−1)/N); E = z×√(p(1−p)/n) or with FPC: ×√((N−n)/(N−1))
Probability Calculator
Two events (P(A), P(B)) or normal distribution (area between bounds)
Formulas: Two events: P(A∪B)=P(A)+P(B)−P(A∩B); P(AΔB)=P(A)+P(B)−2P(A∩B); Series: P(all)=p^n, P(at least one)=1−(1−p)^n; Normal: P = Φ((Rb−μ)/σ) − Φ((Lb−μ)/σ)
Z-Score Calculator
z = (x − μ) / σ
Formula: z = (x − μ) / σ
Confidence Interval Calculator
Mean ± Z × (s / √n). For population mean from sample.
Formula: CI = x̄ ± z × (s/√n); margin = z × (s/√n)
Ratio
Simplify ratio, solve proportion, or ratio to percentage
Linear & Quadratic Equation
One linear (ax + b = c), quadratic ax² + bx + c = 0, or linear systems 2×2 / 3×3

Solves ax + b = c → x = (c − b) / a

Permutation & Combination
nPr and nCr
Prime & Factors
Check prime, list factors, LCM, GCD
Ohm's Law
V = I × R — enter any two to find the third and power
Formula: V = I × R; P = V × I
Decibel (dB)
dB to power/voltage ratio and back
Formula: Power ratio = 10^(dB/10); Voltage ratio = 10^(dB/20)
Density
Mass, volume, density — enter two to find the third
Formula: ρ = m / V (density = mass / volume)
Molarity Calculator
Molarity (M), moles, volume — enter two to find the third
Formula: M = n / V (molarity = moles / volume in L)
Molecular Weight Calculator
Sum atomic masses from chemical formula (e.g. H2O, CaCO3)
Dilution (C₁V₁ = C₂V₂)
Enter three of concentration/volume to find the fourth
Formula: C₁V₁ = C₂V₂
Solution Mixing
Mix two solutions to get final concentration
Mass Percent
Mass of solute / total mass × 100
ppm / ppb
Parts per million or billion from mass or concentration
Moles (mass ↔ moles)
n = m / M (moles = mass / molar mass)
Formula: n = m / M
Limiting Reactant
Compare moles / stoichiometric coefficient to find limiting reactant and theoretical yield
Ideal Gas Law (PV = nRT)
Enter three of P, V, n, T to find the fourth. R = 0.08206 L·atm/(mol·K)
Formula: PV = nRT
Gas Density
ρ = PM / (RT) — density from pressure, molar mass, temperature
Gas Cylinder Duration
Estimate time until cylinder empty at given flow rate (simplified: ideal gas)
pH from [H⁺]
pH = −log₁₀[H⁺]; enter [H⁺] in mol/L
Formula: pH = −log₁₀[H⁺]
pH Adjustment
Amount of strong acid/base to add to reach target pH (simplified: pure water or buffer)
Buffer (Henderson–Hasselbalch)
pH = pKa + log₁₀([A⁻]/[HA])
Specific Gravity
SG = ρ / ρ_ref (default ρ_ref = 1000 kg/m³ for water)
Molar Mass to Density
Density from molar mass and molarity (ρ ≈ M × C for dilute aqueous; or enter mass/volume)
Batch / Scale Recipe
Scale recipe by factor: new amount = base amount × scale
Yield
Percent yield = (actual / theoretical) × 100
Purity
Purity % = (pure mass / total mass) × 100
Faraday's Law
Q = n_e × F; charge from moles of electrons (F ≈ 96485 C/mol)
Electroplating
Mass deposited: m = (I × t × M) / (n × F); I=current (A), t=time (s), M=molar mass, n=electrons per ion
Chlorine Dosing
Mass or volume of chlorine needed for target ppm (e.g. pool)
Water Hardness
Convert Ca²⁺ and Mg²⁺ to mg/L as CaCO₃ equivalent
Alkalinity
Alkalinity as mg/L CaCO₃ from titrant volume and normality
Chemical Dosing
Dose (mg/L or g/L) from target concentration and volume
ABV (Alcohol by Volume)
Simple: ABV ≈ (OG − FG) × 131.25 (OG/FG as specific gravity)
Sugar Concentration (Brix / Plato)
Brix ≈ Plato for dilute solutions; % sucrose by mass
Alcohol Dilution Calculator
Dilute spirit to target ABV — how much water (or diluent) to add
Beam Deflection
Simply supported beam with center point load or uniform load → max deflection
Formula: Point load: δ = PL³/(48EI); Uniform: δ = 5wL⁴/(384EI)
Stress & Strain
Force and area → stress; length change → strain and approximate modulus
Formula: σ = F/A (stress); ε = ΔL/L₀ (strain); E = σ/ε (modulus)
Bending Moment Calculator
Force × perpendicular distance → bending moment (M = F·d). Supports N, kN, lbf, kip and m, mm, ft, in.
Formula: M = F × d (bending moment)
Load Converter
Convert between force/load units: newton (N), kilonewton (kN), pound-force (lbf), kip
Enter exactly one value; the others will be calculated.
Column Buckling & Load Capacity
Slenderness ratio, end conditions, Euler buckling load, and safety factor → capacity check and failure mode warning
Formula: P_cr = π² E I / (K·L)²; λ = K·L / r
Retaining Wall Stability Simulator
Active earth pressure, sliding and overturning checks, bearing pressure, optional water table
Structural Project Risk Analyzer
Load uncertainty, safety factor sensitivity, material cost volatility, and code compliance → risk rating
Load uncertainty
Safety factor sensitivity
Material cost volatility
Code compliance flags
Moment of Inertia
Common shapes (rectangle, circle, hollow circle) → second moment of area
Thermal Expansion
Length, coefficient, and temperature change → change in length and new length
Fluid Flow
Pipe diameter with either flow rate or velocity → solve the other
Provide diameter and at least one of flow rate or velocity; the other will be calculated.
Atmospheric Calculator
All-in-one atmospheric calculator: dew point, humidity, heat index, wind chill, LCL, wet bulb, air density, and density altitude with documented approximations.
Formulas follow common textbook and NWS-style approximations; local terrain, radiation, and instrument errors are not modeled.
Psychrometric Calculator
Psychrometric summary: dew point, mixing ratio, vapor pressures, wet bulb, virtual temperature, θ and θe in one table.
RH = 0% leaves dew point undefined in this model; other rows still compute.

Open full atmospheric calculator →

Dew Point Calculator
Dew point calculator: convert between dew point, relative humidity, and temperature in °F or °C using a Magnus–Tetens vapor approximation.
Assumes flat equilibrium over liquid water; frost or ice crystals can shift real dew points slightly.

Open full atmospheric calculator →

Vapor Pressure Calculator
Vapor pressure calculator: saturation from temperature, actual from RH, or from dew point (Magnus–Tetens).
Pressures in hPa (mb) and Pa where shown.

Open full atmospheric calculator →

Mixing Ratio Calculator
Mixing ratio calculator from temperature, relative humidity, and pressure in inHg or hPa.
Assumes ideal gas and liquid-water equilibrium for saturation.

Open full atmospheric calculator →

Virtual Temperature Calculator
Virtual temperature calculator from dry-bulb, relative humidity, and pressure (moist-air ideal gas).
Small deviations vs radiosonde equations are normal; this is a compact form.

Open full atmospheric calculator →

Equivalent Potential Temperature Calculator
θe calculator: approximate equivalent potential temperature from temperature, humidity, and pressure for meteorology study.
Not for operational forecasting or storm decision-making without soundings and official data.

Open full atmospheric calculator →

Wet Bulb Calculator
Wet-bulb temperature calculator from dry-bulb, relative humidity, and station pressure using a standard psychrometric solve.
Natural wet-bulb in extreme heat may differ from this idealized ventilated-bulb model.

Open full atmospheric calculator →

Heat Index Calculator
Heat index calculator from air temperature and humidity. Uses NWS-style regression in the warm band with conservative interpretation text.
Official NWS tables can apply additional rounding; use this as an estimate.

Open full atmospheric calculator →

Wind Chill Calculator
Wind chill calculator using the NWS 2001 formula where applicable, with mph wind speed and °F/°C air temperature.
Clothing, moisture, and sunshine change perceived cold; this is a standardized estimate only.

Open full atmospheric calculator →

LCL / Cloud Base Calculator
LCL calculator: estimate lifting condensation level (cloud base height) in feet and meters from surface temperature and dew point.
Storm chasing and aviation require real soundings and official products—use this only as a quick sanity check.

Open full atmospheric calculator →

Air Density Calculator
Air density calculator: moist-air density from temperature, pressure (inHg or hPa), and relative humidity or dew point.
Does not model compressibility at extreme altitudes or non-ideal gas corrections.

Open full atmospheric calculator →

Pressure Altitude Calculator
Pressure altitude calculator from station pressure and sea-level / altimeter setting (ISA hypsometric).
Use official altimetry and procedures for flight; this is a study aid.

Open full atmospheric calculator →

Density Altitude Calculator
Density altitude calculator from pressure altitude or station pressure plus sea-level pressure and outside air temperature.
Humidity tweaks to density altitude are small and omitted here for clarity; add a safety margin operationally.

Open full atmospheric calculator →

Lightning Distance Calculator
Lightning distance calculator from flash-to-bang time using speed of sound; miles, km, feet, and meters.
If you can hear thunder, you can be struck. Seek shelter immediately—this tool is not a safety guarantee.

Open full atmospheric calculator →

Acceleration
a = Δv / Δt — enter two to find the third
Formula: a = Δv / Δt
Stopping Distance
Reaction distance + braking distance = total stopping distance
Formula: Reaction d = v×t; Braking d = v²/(2a); Total = reaction + braking
Free Fall
Time, velocity, and height — enter two to find the third (g = 9.81 m/s²)
Formula: v = √(2gh); t = √(2h/g); h = ½gt²
Projectile Motion
Initial speed and launch angle → range, max height, flight time (g = 9.81 m/s²)
Formula: R = v₀² sin(2θ)/g; H = v₀² sin²θ/(2g); T = 2v₀ sinθ/g
Force (F = ma)
Force, mass, acceleration — enter two to find the third
Formula: F = m × a
Weight
W = m × g (default g = 9.81 m/s²)
Formula: W = m × g
Kinetic Energy
KE = ½mv² — enter two to find the third
Formula: KE = ½ m v²
Potential Energy
PE = mgh — enter two to find the third (g = 9.81 m/s²)
Formula: PE = m × g × h
Work
W = F × d (force along displacement) — enter two to find the third
Formula: W = F × d
Hydrostatic Pressure
P = ρgh — pressure at depth (liquid)
Formula: P = ρ × g × h
Buoyancy
F_b = ρ_fluid × V × g — buoyant force on submerged volume
Formula: F_b = ρ × V × g
Heat Energy
Q = mcΔT — heat to change temperature
Formula: Q = m × c × ΔT
Wave Equation
v = f × λ — speed, frequency, wavelength (enter two to find the third)
Formula: v = f × λ
Centripetal Force
F = mv²/r (or F = mω²r) — force for circular motion
Formula: F = m v² / r
Friction Force
F_f = μ × N — sliding friction
Formula: F_f = μ × N
Momentum
p = mv — enter two to find the third
Formula: p = m × v
Efficiency
η = (useful output / input) × 100%
Formula: η = (output / input) × 100%
Load & Demand
Connected loads and demand factor → service load and estimated service current (approximate)
For NEC-compliant designs, always verify against the actual code tables for your occupancy and jurisdiction.
Service Load Calculation Engine (NEC)
Residential & small commercial: demand factors, continuous vs non-continuous, EV, generator interlock, 200A/400A recommendation.
System
General loads (VA)
Appliances & HVAC
Optional
Code reference: NEC Art. 220. Verify against current code and jurisdiction.
Arc Flash Risk Estimator
Fault current from transformer; working distance → simplified incident energy and PPE category suggestion.
Simplified estimator. For compliance use dedicated arc-flash study software.
Panel Schedule Builder
Build a panel schedule: breakers, phases, neutral load, AFCI/GFCI. Print or copy.
Panel
Breakers
Conduit Fill & Derating
Mixed sizes, THHN/XHHW, ambient & bundling correction, max fill, conduit recommendation.
NEC max fill: 53% (1), 31% (2), 40% (3+). Derating per 310.15(B).
Lighting Design
Simple lumen method: room area, target illuminance, and fixture lumens → number of luminaires
Cable Pulling Tension
Total pull tension and bend radius → sidewall bearing pressure
Material Takeoff & Cost
Up to three line items → extended cost and total (quick estimating aid)
Electrical Job Cost & Margin
Labor rate, material cost, overhead, profit margin → price to charge. Quote comparison mode.
Labor
Materials & overhead
Margin
Quote comparison (optional)
Code Cross-Reference
Organize code sections for a project and quickly highlight matches (does not contain code text)
Water Pipe Sizing
Flow, length, and limits → recommended nominal size (using Hazen–Williams approximation)
Rule-of-thumb sizing only. For critical systems, verify against local plumbing code tables.
Gas Pipe Sizing
Flow and velocity limit → approximate nominal gas pipe size (velocity-based)
Uses simple velocity-based sizing. Always confirm with official gas-sizing tables for your code and pressure range.
Drain, Waste & Vent (DWV)
Total fixture units and slope → rule-of-thumb horizontal branch and building drain sizes
Sizing is approximate and for quick checks only. Confirm with your plumbing code (e.g. IPC or UPC) tables for occupancy and fixture mix.
Pressure Loss
Water line diameter, length, and flow → velocity and friction loss (Hazen–Williams)
Pump Curve Analyzer
Required vs. pump BEP flow/head → simple match index (for quick screening only)
Fixture Unit Summary & Layout
Up to four fixture types → total fixture units and suggested building drain size (rule-of-thumb)
Pipe Sizing Engine
Fixture units, material, and run → design flow, velocity check, and smallest pipe that meets limits (conceptual)
Uses a simplified demand factor model and Hazen–Williams. For permit work, verify against your plumbing code’s sizing tables.
Water Pressure Drop Planner
Up to three pipe segments + elevation → friction loss, static loss, and booster pump suggestion
Tool is approximate and assumes full-flow Hazen–Williams behavior. Always verify with detailed design calculations.
Drainage & Vent Stack Planner
Fixture units, slope, and trap arms → suggested branch/stack sizes and code-style checks (conceptual)
Uses generic IPC/UPC-style rules of thumb. Always confirm layout and sizing with your local plumbing code.
Tankless Water Heater Sizing
Simultaneous fixtures, inlet temperature, and climate → required GPM and BTU/hr
Simultaneous fixtures
Assumes typical low‑flow fixtures. For exact sizing, use manufacturer charts for your model and gas type.
Plumbing Job Estimator
Materials, labor, overhead, margin, and emergency markup → recommended quote and profit
Base costs
Emergency / after‑hours
GPM & LPM Converter
Convert between gallons per minute, liters per minute, and cubic meters per hour
Enter exactly one value; the others will be calculated.
Water Pressure Converter
Convert between psi, bar, kPa, and meters of water column
Enter exactly one value; the others will be calculated. Uses standard freshwater approximations.
Drain Slope Calculator
Any two of run, drop, and slope → compute the third for basic drain layout
Enter any two values; the third will be calculated. Positive slope means flowing “downhill.”
Tank Volume Calculator
Rectangular or cylindrical tank dimensions and fill height → volume in ft³, gallons, and liters
Battery Life
mAh, voltage, and load → hours of use
Voltage Drop
Approximate voltage drop and % for a copper run
Advanced Voltage Drop Planner
Multi-segment runs, Cu/Al, temperature, parallel conductors, motor surge, cost comparison, optimize for <3%.
Wire Size
Suggest minimum AWG for a circuit based on length, current, and allowed voltage drop
Power Calculator
Single- or three-phase: voltage, current, power factor → kW, kVA, and kVAR
Electricity Cost
Power, usage hours, and rate → kWh and cost per day, month, and year
Battery Backup Calculator
kWh needed to cover a load for a given outage duration (with optional reserve)
Generator & Backup Power Sizing
Whole-home loads, startup surge, fuel type, transfer switch, runtime. Residential & light commercial.
Torque Calculator
Power and speed → torque (or use torque and speed to get power)
Bolt Torque
Preload, diameter, and K-factor → tightening torque
Gear Ratio
Driver and driven teeth (or speeds) → gear ratio and speed change
Motor Speed
Line frequency, poles, and slip → synchronous and running RPM
Solar Panel / Savings
System size, tilt factor, sun hours, and rate → daily, monthly, and yearly kWh and bill savings
Roof Angle / Tilt Calculator
Roof pitch or latitude → tilt angle, tilt factor, and seasonal bias notes
Sun Hours by Location
Latitude and climate band → approximate average peak sun hours per day
kWh & Watts Converter
Any two of power, energy, and hours → compute the third
Enter any two values; the third will be calculated.
Solar System Sizing Engine (Residential)
Monthly usage, climate, roof orientation, and losses → required DC size, panel count, and 20‑year production curve (conceptual)
Solar ROI & Financial Simulator
System cost, incentives, escalation, and financing → payback, NPV, and IRR (conceptual)
Loan scenario (optional)
Lease scenario (optional)
Battery Storage Sizing Tool
Critical loads, outage duration, chemistry, and generator → recommended kWh and module count (conceptual)
The optimizer also reports the minimum battery size to cover a 12‑hour outage at the entered average load.
Solar Array Layout Planner
Roof dimensions, panel size, spacing, and obstacles → estimated rows, strings, and layout summary (conceptual)
Assumes portrait orientation and simple rectangular roof. For permit drawings, use full layout tools and manufacturer requirements.
Commercial Solar Feasibility Tool
Demand charges, TOU rates, incentives, and depreciation → annual savings and simple cash‑flow view (conceptual)
Solar + EV + Battery Integration Planner
EV charging, home battery, and solar → annual energy flows, self‑consumption, and autonomy (conceptual)
EV charging
Battery
Rates & net metering
Resistor Color Code
4-band or 5-band → resistance and tolerance
Capacitor Code
Code → capacitance (pF, nF, µF). Supports 3-digit (e.g. 104), letter suffix (10n, 22p, 4u7)
Break-Even
Fixed cost, variable cost, price → break-even units and revenue
Cost & Revenue vs Units
Margin vs Markup
Convert between margin % and markup %; cost and sell price
Area & FAR
Lot area, footprint, and floors → floor area ratio (FAR)
Occupancy Load
Area and load factor → maximum occupants
Ramp Slope
Rise and run → slope percent and ratio
Sun Angle & Shadow
Any two of height, sun angle, or shadow length → solve the third
Enter any two values; the third will be calculated. Use consistent units for height and shadow.
Concrete
Slab length, width, and thickness → volume and bag count
Tile
Room size and tile size → tiles needed (with waste)
Paint
Room dimensions and coats → gallons of paint
Flooring
Room area and waste → total flooring needed
Stair Design
Total rise and run → number of steps and dimensions
Square Footage
Length and width → area in sq ft and sq m
Gravel
Area and depth → gravel volume and tons
Mulch
Beds area and depth → mulch cubic yards and bags
Roofing
Roof size and pitch → squares and bundles
Roofing Material Optimizer
Roof geometry, complexity, and productivity → shingles, underlayment, fasteners, and labor estimate
Deck
Deck size → area and board count (approximate)
Framing Layout Optimizer
Wall length, stud spacing, and openings → studs, waste, and cost estimate
Slab Thickness & Reinforcement Estimator
Uniform load, f′c, slab size → suggested thickness, deflection estimate, rebar spacing suggestion, and takeoff
Design inputs
Reinforcement
Suggested thickness from span/depth; deflection from one-way strip. Confirm with project specs and codes.
Concrete Pour Planner
Slab, waste, trucks, reinforcement, cost, crew, and cure milestones in one view
Structural Load
Uniform floor/roof load, span, and spacing → line load, reactions, and max moment/shear (for checking against tables)
Results are for simple spans with uniform load. Use official span tables or an engineer for final sizing.
Beam Load & Deflection Engine
Multiple support types, uniform and point loads, wood/steel/concrete, deflection limits (L/240–L/480), pass/fail, minimum beam size
Footing & Soil Bearing Planner
Total load, soil bearing, footing size, safety margin, and settlement estimate
Earthwork / Cut & Fill
Area and average cut/fill depths → volumes in cubic yards and net balance
Rebar Weight & Spacing
Bar size, length, and spacing → total weight and number of bars
Soil Compaction Calculator
Field density and moisture → dry density, % compaction (relative to max dry density)
Asphalt Tonnage Estimator
Area, thickness, and density → tons of asphalt needed
Drainage Flow Rate
Manning formula: slope, area, hydraulic radius → flow (open channel)
Steel Beam Weight
Section weight per foot × length → total weight (A36 steel)
Section Modulus Calculator
Rectangular section: width × depth → S = bd²/6 (in³ or mm³)
Bolt Shear & Tensile Capacity
Bolt diameter and material → approximate shear and tensile capacity (A325/A490)
Three-Phase Power Calculator
kW ↔ amps, line voltage, power factor (3-phase)
Transformer Sizing
Load kVA or kW (with PF) → recommended transformer kVA
Power Factor Correction
Current PF and target PF → reactive kVAR and capacitor size
Pump Horsepower Calculator
Flow (GPM), head (ft), and efficiency → brake horsepower
Land Area (Irregular Polygon)
Shoelace formula: enter coordinates (ft or m) → area
Enter vertices in order (e.g. N, E or X, Y). One point per line: x,y (e.g. 0,0 then 100,0 then 100,50 then 0,50)
Slope Distance Calculator
Horizontal distance and elevation change → slope distance and grade %
Reynolds Number Calculator
Re = ρVD/μ — pipe flow (diameter, velocity, density, viscosity)
Pipe Pressure Drop (Gas)
Simplified: flow, pipe size, length → pressure drop (Darcy-Weisbach style)
Flow Velocity in Pipe
Flow rate and pipe diameter → velocity (ft/s or m/s)
Fiber Link Budget Calculator
Transmit power, cable loss, splices, connectors → received power and margin
Signal Loss / Attenuation
Loss per unit length × distance → total dB loss
Thermal / HVAC Load
Rule-of-thumb heating & cooling load from area, height, and insulation level
Approximate “block load” only. For detailed HVAC design, use full Manual J / ASHRAE methods.
Room BTU Calculator
Single room dimensions and insulation → recommended heating & cooling BTU/hr
CFM Calculator
Room volume and target air changes per hour → required supply airflow (CFM)
Air Changes Per Hour
Measured airflow and room size → air changes per hour (ACH)
SEER Savings Estimator
Existing vs new SEER, usage, and rate → annual energy savings and simple payback
Heat Load Engine (Manual J Simplified)
Floor area, envelope, windows, and climate → estimated heating & cooling BTU/hr and equipment size (conceptual)
Conceptual sizing only. For permit or code‑critical designs, use full Manual J or local engineering standards.
Duct Sizing Planner
Target airflow, length, and friction rate → suggested duct size, velocity, and static margin (conceptual)
HVAC System Cost & ROI Simulator
Existing vs upgrade system (cooling + heating) → annual cost, lifetime cost, and simple payback
Existing system
Upgrade scenario
Refrigerant Line Sizing
Tonnage, line length, and rise → equivalent length, capacity impact, and oil return risk (conceptual)
HVAC Quote Builder
Equipment, labor, overhead, and financing → customer price, margin, and monthly payment
Costs
Add‑ons & margin
Financing
Bill of Materials (BOM)
Quick material list with extended costs and project total
Labor Burden & Productivity
Crew size, wage, burden, and productivity → daily and total labor cost and cost per unit
Project Margin Simulator
Material volatility, labor shifts, and delays → best/worst-case margins and break-even
Schedule / Gantt Export
Any number of tasks → sequential schedule, dates (optional), and CSV-friendly rows
Tasks are treated sequentially. Copy the CSV-style output row into your scheduling or Gantt software.
Construction Bid Comparison
Compare any number of bids with schedule, material normalization, and risk‑weighted cost model
Bid
Bid
Bid
Everyday Calculators

Use these calculators for daily life. Date & Time covers age, days between dates, time zone, countdown, and stopwatch. Cooking includes recipe scaling, kitchen converter, and coffee ratio. Random & Generators offers random number, coin flip, dice, password, and more. Quick & Handy has tip calculator, tally counter, shoe size, GPA, and grade. Search or pick a category below to start.

Tools by category

Tally Counter
Count people, score, or clicks. Use ＋ to add, － to subtract. Keyboard: space or ＋ key to add, － to subtract. Value is saved in your browser.
0
Tip Calculator
Split bills and calculate tips
Bill vs Tip
GPA Calculator
Weighted GPA from course grades and credit hours
CourseGradeCredits
Grade Calculator
Weighted final grade from assignments
AssignmentScoreMax ScoreWeight (%)
BMI & BMR Calculator
Body Mass Index and Basal Metabolic Rate — one form, both results. Choose metric or imperial for weight and height below.
BMR (Mifflin-St Jeor)
Body composition
Formulas: BMI = weight(kg)/height(m)²; BMR (Mifflin-St Jeor): male 10×wt+6.25×ht−5×age+5, female …−161
Body Surface Area (BSA)
Height & weight → body surface area using Mosteller, Du Bois, and Haycock formulas.
Calorie / TDEE Calculator
Total Daily Energy Expenditure and calories burned per activity
Calories burned (single activity)
Ideal Weight Calculator
Four established formulas (Devine, Robinson, Miller, Hamwi)
Height Calculator (Adult Height Predictor)
Estimate child's adult height from current height and age (Khamis-Roche method or mid‑parental)
Body Fat % Calculator
Tape-method body fat using Navy / Army formulas with fitness and branch categories.
Macro Calculator (Ideal Macros for Goal)
Protein, carbs & fat targets from your TDEE and diet goal
Protein Calculator
Daily protein target from bodyweight and goal (rough guideline only)
Water Intake
Daily water recommendation by weight and activity
Waist-to-Hip
Waist / hip → ratio and category
Waist-to-Height
Waist / height → ratio and cardio‑metabolic risk band
GFR Calculator (Kidney Function)
Estimated glomerular filtration rate (eGFR) — CKD-EPI formula. For reference only; not a diagnosis.
Formula: CKD-EPI: eGFR = 141 × min(SCr/κ,1)^α × max(SCr/κ,1)^(−1.209) × 0.993^age
Calories Burned Calculator
MET × weight × time → calories (approximate)
Pace Calculator
Running pace, distance & time — enter any two to find the third
Race Time Predictor
Predict marathon / half-marathon time from a recent race (Riegel formula)
VO₂ Max Calculator
Estimate aerobic capacity from max and resting heart rate
Target Heart Rate
Age-based zones (e.g. 50–85% max)
Training Pace Calculator
From a recent race time: easy, tempo, interval, long run
One Rep Max (1RM)
Estimate 1RM from weight and reps (Epley formula)
Formula: Epley: 1RM ≈ weight × (1 + reps/30)
Strength Standards Calculator
Compare your lifts to beginner / intermediate / advanced (ratio to bodyweight)
Wilks / Powerlifting Score
Total (squat + bench + deadlift) adjusted for bodyweight
Training Volume Calculator
Total weight lifted = sum of (weight × reps) per set

Example: 100×5 means 100 kg × 5 reps. Use space or × between weight and reps.

Cycling Speed Calculator
Distance + time → average speed
Cycling Power (Watts)
Estimate power from weight, speed, and gradient
Bike Gear Ratio
Chainring × cassette → ratio and speed at cadence
Swimming Pace Calculator
Time and distance → pace per 100 m or 100 yd
Rowing Split Calculator
Time for 500 m from total time and distance, or enter 500 m time
Steps to Calories Calculator
Steps, step length, and weight → distance and approximate calories burned (walking)
Vertical Jump Calculator
Jump height → standing reach needed to touch rim / dunk
40-Yard Dash Speed Calculator
Time for 40 yards → speed in mph and km/h
Ideal Marathon Time Predictor
Enter a recent race to predict marathon time (Riegel)
Sleep Cycle
Wake time → suggested bedtimes (90‑min cycles)
Caffeine Intake Calculator
Estimate daily caffeine intake and compare with common guidance limits.
Blood Alcohol (BAC)
Weight, sex, drinks, time → rough BAC estimate
Blood Pressure
Systolic / diastolic → category based on ACC/AHA guidelines.
A1c & Average Glucose
Convert between A1c (%) and estimated average glucose (eAG).
Cholesterol Ratios
Total, HDL, LDL, triglycerides → common lipid ratios and rough interpretation.
Dosage
mg/kg, weight → dose (mg); optional unit
Life Expectancy
Very rough estimate of remaining years based on age, sex, smoking, and lifestyle (for fun only — not medical advice)
Due Date Calculator
Naegele's rule (LMP) and IVF Day-3 / Day-5 transfer methods
Pregnancy Tracker
Gestational age, trimester, EDD, and week-by-week milestones
Conception Window & Ovulation
From due date → fertile window; or from last period → ovulation & next period
Pregnancy Weight Gain
IOM 2009 guidelines by pre-pregnancy BMI — single and twin pregnancies
Age Calculator
Exact age, workdays lived, next milestone birthday, and more
Days Between Dates
Days, weeks, months, and years between two dates
Time Zone Converter (Meeting Planner)
Convert a date/time between UTC offsets. Use Meeting Planner to see one time in multiple zones side‑by‑side.
Result
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World Time — current time
Your time—
New York—
London—
Paris—
Tokyo—
Sydney—
Meeting Planner — same time in multiple zones
Countdown Timer
Set a target date and time; see time remaining (updates every second)
—
Stopwatch
Elapsed time with Start, Pause, Reset. Name a session and log it to track productivity.
00:00:00.0
Business Days Calculator
Count business days between two dates or compute end date from business days (excludes weekends and optional holidays).
Military Time Converter
Convert between 24‑hour and 12‑hour (AM/PM) time formats.
Time Calculator
Add or subtract hours, minutes, and seconds
Hours Calculator
Time card, shift schedule, and break summary. Calculate hours worked and weekly pay.
Sunrise / Sunset Calculator
Sunrise and sunset times for a date and location (latitude/longitude)
Moon Phase Calculator
Moon phase, illumination %, and age in days for any date
Random Number Generator
Generate random integers or decimals
Generated Numbers
Password Generator
Generate secure, random passwords
Check Password Strength
Coin Flip
Flip a virtual coin — Heads or Tails
Dice Roller
Roll one or more dice (d4, d6, d8, d10, d12, d20)
Random Name Generator
Generate random first names, last names, or full names
Random Card Generator
Draw one or more random playing cards
Spin the Wheel
Enter options (one per line), then spin to pick one at random
Random Letter Generator
Generate random letters (A–Z or a–z)
Random Color Generator
Generate random colors (HEX, RGB) with optional copy
Random Date Generator
Generate random dates within a range
Random Country / City
Pick a random country or major city
Recipe Scaling
Scale ingredient amounts when changing servings or pan size

Use square inches or cm² (e.g. 8×8 in pan → 64 in², 9 in round → ~64 in²).

Grocery / Food Budget
% of income on food or set a monthly food budget
Egg Boiling Calculator
How long to boil eggs for soft, medium, or hard yolks. Optional: starting temp, altitude or pressure, or boiling point.
Butter Calculator
Convert between sticks, cups, tablespoons, and grams (US butter: 1 stick = ½ cup = 8 tbsp ≈ 113 g).
Cake Pan Converter
Adjust baking for a different pan size: enter dimensions or area of original and new pan to get the scale factor.
Yeast Converter
Convert between active dry, instant, fresh (cake), compressed, and brewers' yeast. Typical ratio: 1 active dry ≈ 1 instant ≈ 2.5 fresh/compressed.
Kitchen Converter
Convert between cups, grams, spoons, and more, using ingredient-specific densities.
Coffee Ratio Calculator
Coffee : water ratio (e.g. 1:15, 1:17) — enter one of coffee or water to get the other
Steak Cook Time
Grilling or pan-searing time by thickness and doneness. Internal temp targets included.
Healthy Coffee
See how your coffee habits stack up: cups, bean/roast, brewing, and add-ons.
Coffee Kick
Rough caffeine and timing: sleep, wake time, and planned drinks.
Coffee Footprint
Estimate CO₂ and water impact of your coffee consumption.
Sourdough Calculator
Baker's percentage: flour 100%, water, starter, and salt. Get ingredient weights.
How Much Rice per Person
Estimate dry rice and water needed based on servings, meal type, and appetite.
Rice & Pasta Planner
How much dry rice or pasta and water do you need for a crowd?
Turkey Cooking Time
Estimate roast duration and thawing time from turkey weight.
Party Food & Drink Planner
Estimate how much food and drink to buy for your event.
Wedding Alcohol Calculator
Estimate bottles of wine, beer, champagne, and vodka for your reception.
Salad Calories
Estimate calories from common salad ingredients and servings.
Pizza Dough Calculator
Scale pizza dough ingredients by dough ball count, weight, and baker's percentages.
Sourdough Hydration Calculator
Calculate flour and water from target hydration, starter amount, and starter hydration.
Shoe Size Converter
Convert between US Men, EU, and UK sizes
Result
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Clothing Size Converter
Convert between US, EU, and UK clothing sizes
Result
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Dress Size from Measurements
Bust, waist, hips (in or cm) → US / EU / UK dress size
Ring Size Converter
Convert between US ring size and inner diameter (mm)
Result
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Bra Size Calculator
Band + bust measurement → US / UK cup and band size
Baby Name Generator
Generate random baby names by style
Business Name Generator
Random business or brand name ideas
Fantasy Name Generator
Generate names for characters, places, or creatures
Pet Name Generator
Cute and catchy names for dogs, cats, and other pets
Random Username Generator
Generate unique usernames (adjective + noun + numbers)
Fake Credit Card Generator
Generate Luhn-valid test card numbers. For development/testing only; do not use for real payments.
Trip Cost Calculator
Trip cost, fuel needed, or MPG from distance and fuel used. Use for drive planning and travel budgets.
Commute Calculator
Compare monthly cost of driving vs public transport. Enter one or both to see which is cheaper.
Flight Time Calculator
Estimate flight duration from distance, cruise speed, and taxi/buffer time.
Jet Lag Calculator
Estimate adaptation days from timezone shift and direction of travel.
Travel Packing Checklist
Generate a printable packing list by trip type and duration. Add your own items, then copy or print.
Moving Checklist
Tasks and reminders for your move. Generate the list, add your own items, then copy or print.
Wedding Checklist
Plan your wedding with a step-by-step checklist. Add your own items, then copy or print.
Startup Launch Checklist
Launch your startup with a clear checklist. Add your own items, then copy or print.
Restaurant Opening Checklist
Open your restaurant with nothing missed. Generate the list, add items, then copy or print.
Home Buying Checklist
From pre-approval to closing. Generate the list, add your own items, then copy or print.
Distance Calculator
Distance between two points (2D, 3D, or latitude/longitude on Earth)
Point 1:
Point 2:
Distance
—
Formula: d = √((x₂−x₁)² + (y₂−y₁)²) [add +(z₂−z₁)² for 3D]
Alcohol Dilution Calculator
Dilute spirit to target ABV — how much water (or diluent) to add
Hiking Time Estimator
Estimate hiking time using Naismith’s rule with options for pace and conditions
Calories Burned Hiking
Estimate calories burned on a hike from distance, elevation, and body weight
Water Requirement Calculator
Day‑hike or backpacking: estimate water needed from hours, heat, and exertion level
Survival Water Calculator
Minimum daily water per person for survival scenarios (estimate only — not medical advice)
Camp Cooking Calculator
Estimate food weight and stove fuel for camping trips
Firewood Requirement Calculator
Estimate bundles or cubic feet of firewood needed for camping
Backpack Weight Calculator
Total pack weight and % of body weight for backpacking or thru‑hikes
Elevation Gain Calculator
Convert between feet and meters and summarize total elevation gain per mile or km
Pace Count Calculator
Estimate how many double‑steps (paces) you take per 100 m or 100 yd and convert distance ↔ pace count
Hypothermia Risk Calculator
Approximate outdoor hypothermia risk category from air temp, wind, clothing, and wetness (informational only)
Frost Risk Calculator
Garden / crop frost risk from forecast low, dew point, and exposure (simplified)
Garden Soil Calculator
Estimate soil volume for raised beds and convert to cubic yards and bags.
Pool Volume Calculator
Calculate pool volume in gallons and liters for rectangular or round pools.
Estimated Time of Arrival (ETA)
Distance and speed → travel time and arrival clock time
Horizon Distance Calculator
Estimate distance to the horizon from eye height (spherical Earth approximation)
Hull Speed Calculator
Displacement hull speed from waterline length
Boat Speed Calculator
Speed made good from distance and elapsed time (nautical or statute)
True vs Apparent Wind Calculator
Boat speed and true wind → apparent wind speed and angle (simplified)
Course & Bearing Calculator
Compute course and distance between two coordinates (great‑circle approximation)
Signal Visibility Distance
Estimate how far away a light or signal can be seen from given heights
Coordinate Converter
Latitude/longitude: decimal degrees ↔ degrees / minutes / seconds (DMS).
Nautical Unit Converter
Quick conversions between nautical miles, knots, km, and mph
Cocktail Finder
What drinks can you make with what you already have? Match your cabinet in seconds.

Select what you have on hand and instantly see cocktails you can make now or with one extra bottle/ingredient.

Select common sets:

Base Spirits

Liqueurs

Mixers / Juices

Sweeteners / Syrups

Bitters / Seasoning

Bubbles / Soda

Garnish / Herbs

Filter by tag:
0 drinks you can make now
0 one-ingredient away

You can make now

No full matches yet. Add a few more ingredients to unlock recipes.

1 ingredient away

No one-away cocktails with current filters.

Back to Cooking
0 selected
Cocktail Ratio Calculator
Scale cocktails by ratio parts for one drink or a full batch.
Pomodoro Calculator & Timer
Plan sessions or run a live timer: work → short break → long break every N pomodoros.
Live timer
25:00
Work — start the timer
Audiobook Calculator
How many audiobooks in your commute or listening time
TV Series Duration Calculator
How long to watch a full show (episodes × length)
Bath vs Shower Calculator
Compare water use and cost: shower (flow × minutes) vs bath (tub volume).
Appliance Wattage Calculator
Estimate daily and monthly electricity use and cost from appliance watts and hours per day.
Carbon Footprint
Miles flown and car miles → rough CO₂ estimate
Love Calculator
Fun compatibility score based on two names (for entertainment only)
Golf Handicap Calculator
Course handicap from handicap index and slope rating (USGA-style)
Formula: Course Handicap = Index × (Slope/113) + (Course Rating − 72)
Wind Chill Calculator
Feels-like temperature from air temperature and wind speed (NWS formula)
Formula: NWS: 35.74 + 0.6215×T − 35.75×V^0.16 + 0.4275×T×V^0.16 (°F, mph)
Heat Index Calculator
Feels-like temperature from air temp and relative humidity (NWS)
Formula: Rothfusz regression (polynomial in temp °F and humidity %)
Dew Point Calculator
Dew point from temperature and relative humidity (Magnus formula)
Formula: Magnus: γ = ln(RH/100) + (a×T)/(b+T); T_dp = (b×γ)/(a−γ); a=17.27, b=237.7
Tire Size Calculator
Sidewall height, revs per mile, and diameter from tire dimensions (e.g. 225/45R17)
Weird Units Converter
Turn everyday values into fun equivalents: distances, weights, areas, volumes, speeds, and temperatures.
Meeting Cost Calculator
Estimate the cost of a meeting from attendees, average hourly rate, and duration.
Unit Price
Compare price per unit (e.g. $/oz, $/kg)
Engine Horsepower Calculator
Estimate vehicle HP from weight and 1/4‑mile trap speed (elapsed time optional)
Instagram Font Generator
Convert text to fancy Unicode styles — copy and paste into Instagram, bios, and social posts
Result
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Hashtag Generator
Generate hashtags from topics or keywords (comma-separated)
—

Click to copy all

Bio Generator
Short Instagram-style bios — pick a style and generate
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Emoji Picker
Click an emoji to copy it

Click to copy

Finance Calculators

Use these calculators for everyday spending, borrowing, and planning. Everyday Money covers tips, tax, discounts, and fuel costs. Vehicles helps with car affordability, loans, lease vs buy, and EV costs. Borrowing & Loans handles home affordability, mortgages, HELOCs, rent vs buy, and debt payoff. Income & Budget covers paychecks, salary, taxes, and budgeting. Wealth & Investment includes net worth, inflation, bonds, and college cost. Search or pick a category below to start.

Tools by category

Tip Calculator
Split bills and calculate tips
Bill vs Tip
Sales Tax Calculator
Calculate tax amount and final price
Reverse: Find Pre-tax Price
VAT Calculator
Add or remove VAT (value-added tax) from a price
Formula: Add VAT: amount_incl = amount_excl × (1 + rate); Remove: amount_excl = amount_incl / (1 + rate)
Discount Calculator
Find sale price, savings, and effective discount for single or stacked discounts.
Tip: Enter one discount for a single sale, or multiple comma-separated discounts for stacked discounting.
Find Discount % from Prices
Trip Cost Calculator
Trip cost, fuel needed, or MPG from distance and fuel used. Use for drive planning and travel budgets.
Coins to Cash
Counts of US coins → total value in dollars.
Car Affordability
Compare what a lender may approve (DTI) with conservative (~10%) and stretch (~15%) payment guidelines — then see estimated max loan and car price for each.
Results show three scenarios side by side: lender-approved room after your other debt, a ~10% comfort budget, and a ~15% stretch budget.
Affordability Scenarios
Auto Loan Calculator
Vehicle financing with trade-in, down payment, taxes & fees
Principal vs Interest
Balance, Interest & Payment Over Time
Amortization Schedule
Auto Lease Calculator
Monthly lease payment, cost breakdown, and comparison to buying the same car
Lease
If purchased under the same conditions
Lease payment breakdown

Doc, title, and registration fees are not included. Leases often have acquisition, security deposit, and disposition fees; in practice leasing can cost more than this estimate.

Terms

Money Factor — The lease equivalent of an interest rate, usually shown as a decimal (e.g. 0.00208). Multiply by 2,400 to get approximate APR. Set by the lessor; lower is better.

Interest Rate (APR) — Annual percentage rate. Same cost of money as money factor: APR ÷ 2,400 ≈ money factor.

Residual Value — Estimated value of the vehicle at the end of the lease (set by the lessor). A higher residual usually means a lower monthly payment but a higher amount due if you buy the car at the end.

Cash Back or Low Interest
Compare cash back rebate vs low interest rate on an auto loan
Cash Back Offer
Low Interest Offer
Auto & Loan Details
With Cash Back Offer
With Low Interest Offer
Car Depreciation Calculator
Straight-line or declining balance depreciation schedule
Car / Vehicle depreciation (simple % pattern)
TCO Calculator (Total Cost of Ownership)
Vehicle or asset: purchase price + annual costs over years → total cost and cost per mile
EV Charging Cost Calculator
Charging time and cost from battery capacity, current/target charge %, and charging power
Home & Rent Affordability
Big financial decisions — how much house or rent you can afford: income and debt → max home price or max monthly rent. Combines house affordability, rent affordability, and DTI.
Affordability type
Income & debt
Loan & costs
DTI rule
Reverse: target home price
Comparison
Price tiers
Monthly payment at max price
Required income (target price)
Financial health
Approval strength
Lifestyle impact
Down payment
Income comparison
Budget breakdown
Loan & Mortgage
Big financial decisions — conventional, FHA & VA loans with taxes, insurance, PMI/MIP, payoff, refinance and APR views.
1) Property & Loan Basics
2) Program-specific
Conventional — PMI
3) Closing Costs & Cash-to-Close
4) Monthly Ownership Costs
5) Payment Strategy
6) Scenario Settings

Show amounts as:
A) Real Monthly Cost

Payment breakdown
B) Program Cost Impact

C) Cash to Close

D) Loan Summary & Payoff

E) Amortization & Milestones

F) Extra Payments & Biweekly

G) Equity Projection

Chart
Balance & payments over time
Formula: PMT = P × (r(1+r)^n) / ((1+r)^n − 1); r = annual rate/12, n = months
Home Equity & HELOC
Big financial decisions — available equity, Home Equity Loan vs HELOC comparison, costs over time, stress tests, and a clear recommendation.
Your home
Home Equity Loan
HELOC
Best loan payment plan
HELOC draw & repayment
Total cost over time
Net cash & equity
Payment stress test
HELOC sensitivity
Equity vs loan balance
Payment timeline
Recommendation
Rent vs Buy
Big financial decisions — compare average monthly cost of buying vs renting over 1–30 years; break-even and chart
Home purchase
Home rent
Your info
Chart
Average cost by stay length
Staying LengthAverage Buying CostAverage Renting Cost
MonthlyAnnualMonthlyAnnual
Assumptions: fixed-rate fully amortizing mortgage with level payments; investment return is applied to upfront cash as annual compound growth; property tax and insurance grow using the inputs above; tax savings are approximated as (mortgage interest + property tax) × (federal + state marginal rate).
Max Loan Amount
Given a monthly payment, find the maximum loan amount you can afford
APR Calculator
Effective APR including fees (loan amount, fees, term, rate)
Amortization Schedule
Full month-by-month schedule with CSV download
Principal & Interest Over Time
Credit Card Payoff
How long to pay off a credit card with fixed monthly payments
Debt Payoff Planner
Multi-loan payoff: use extra payment to target one strategy (e.g. lowest balance first); when a loan is paid off, its min payment rolls to the next.
Loan NameBalance ($)APR (%)Min. Payment ($/mo)
Per-Loan Results
Strategy Comparison
Balance Over Time
Month-by-Month Payment Schedule
Student Loan Calculator
Standard repayment: balance, rate, term → monthly payment and total interest
Paycheck & Overtime Calculator
Estimate take-home pay: gross or hours + rates, federal & state tax, FICA, 401(k). Uses 2026 federal brackets.
Salary Converter
Enter either annual salary or an amount per period — converts to all other equivalents.
Job Offer Comparison
Compare two offers using compensation, benefits, and commute cost of time.
Offer A
Offer B
Budget Calculator
Income vs spending categories — see totals and surplus/deficit
Monthly expenses (add rows as needed)
Event Budget Calculator
Estimate total cost for events: venue, catering, guests, entertainment, and other line items.
Line items (add/remove as needed)
Commission
Commission amount from sale amount and rate %
Tax Bracket
Effective vs marginal federal tax rate with bracket breakdown (2026 brackets)
Income Tax Calculator
Estimate federal refund or amount owed (2026 brackets, standard deduction)
Marriage Tax Calculator
Compare federal tax: filing jointly vs as two singles (marriage bonus or penalty)
Margin vs Markup
Convert between margin % and markup %; cost and sell price
Break-Even
Fixed cost, variable cost, price → break-even units and revenue
Cost & Revenue vs Units
Net Worth
Total assets minus total liabilities
Bond Calculator
Price, yield to maturity, coupon — enter known values to solve for the unknown
Formula: Price = PV(coupons) + PV(par); PV(coupons) = c×(1−(1+y)^(−n))/y; PV(par) = par/(1+y)^n
Financial Calculator
TVM, NPV, IRR, and financial math. Financial calculator on Calciverse.
0.
College Cost Calculator
Future cost of college and how much to save (with inflation)
Inflation Calculator
Purchasing power over time using average annual rate

💡 US avg: ~3.2% (1913–2024) · 2000s: ~2.6% · 2010s: ~1.8% · 2020–24: ~5.1%

Formula: Future value = Amount × (1 + inflation_rate/100)^years
Purchasing Power Over Time
GDP Calculator
GDP growth over time: initial GDP and annual growth rate → future GDP
Estate Tax Calculator
Federal estate tax estimate: assets minus liabilities and exemption (2026 exemption)
Business Calculators

Use these calculators for pricing, margins, and running the business. Sales & Pricing covers discounts, margin vs markup, unit price, break-even, price increase, revenue growth, ROI, investment return, and creator revenue. Quotes & Invoices helps you generate quotes and invoices. Loan Comparison lets you compare loan offers. Search or pick a category below to start.

Tools by category

Margin vs Markup
Convert between margin % and markup %; cost and sell price
Discount Calculator
Find sale price, savings, and effective discount for single or stacked discounts.
Tip: Enter one discount for a single sale, or multiple comma-separated discounts for stacked discounting.
Find Discount % from Prices
Unit Price Calculator
Price per unit from total price and quantity on Calciverse.
Break-Even
Fixed cost, variable cost, price → break-even units and revenue
Cost & Revenue vs Units
Price Increase
Old and new price → absolute and % change
Revenue Growth
Starting and ending revenue → growth %, CAGR, and yearly breakdown
Creator & Ad Revenue Calculator
One calculator for RPM (YouTube/TikTok/etc.), AdSense, CPM, and affiliate revenue. Pick a mode and enter your numbers.
Meeting Cost Calculator
Estimate the cost of a meeting from attendees, average hourly rate, and duration.
Quote Generator
Simple project quote from rate, hours, discount, and tax on Calciverse.
Invoice Generator
Quick invoice totals from subtotal, discount, and tax (plus due date) on Calciverse.
Loan Comparison
Compare two loans by payment, total cost, and interest
Loan A
Loan B
Real Estate Calculators

Use these calculators for deal screening, analysis, and property management. Deal Screening & Offers covers deal finder, 70% rule, fix & flip, wholesaling, and investor mortgage. Analyze & Execute includes rental property, rehab estimator, BRRRR, and Airbnb. Compare & Exit helps with deal comparison and sell vs keep. Property Management Suite covers rent pricing, lease profitability, vacancy risk, expense benchmark, and portfolio analyzer. Financing includes loans and home affordability. Quick Metrics & Calculators includes rent vs buy, cap rate, cash flow, cash-on-cash, DSCR, house flip, down payment, closing cost, and price per sq ft. Search or pick a category below to start.

Tools by category

Deal Finder Mode
Enter price, rent, and rehab → Calciverse tells you: BUY, NEGOTIATE LOWER, or PASS
70% Rule
ARV, repairs, profit and costs → maximum allowable, safe, aggressive, and danger offers
Fix & Flip (Pro)
Purchase, rehab, ARV, costs, and loan terms → net profit, ROI, offer guidance, and risk
Wholesaling Calculator
ARV, repairs, assignment fee, and buyer profit target → max offer to seller and deal quality
Mortgage (Investor)
Investor‑focused mortgage with extra payments and refinance simulation
Rehab Estimator
Cost per sq ft + detailed line items → total rehab cost and warnings
BRRRR Calculator
Buy, Rehab, Rent, Refinance, Repeat → cash left in, cash out, and infinite return detection
Rental Property Calculator
Full analysis: cash flow, CoC, cap rate, IRR, wealth creation, break-even rent, and deal score.
Purchase
Operating Expenses (annual)
Income
Hold & Sell
Wealth Growth
Cash Flow by Year
Expense Breakdown
Airbnb Calculator
Nightly rate, occupancy, and costs → cash flow, CoC, cap rate, and minimum profitable nightly rate
Cap Rate
Capitalization rate: NOI ÷ purchase price
Cash Flow
Monthly income minus expenses and debt service
Cash-on-Cash Return
Annual cash flow ÷ total cash invested
DSCR
Debt service coverage ratio: NOI ÷ annual debt service
Sell vs Keep
Compare wealth if you sell now vs keep renting, with appreciation and loan paydown
Deal Comparison & Dashboards
Compare saved rental and flip scenarios side by side
Scenarios come from Rental Property Calculator, Fix & Flip (Pro), BRRRR, Airbnb, and other Real Estate tools that save deals.
Rent Pricing Intelligence
Required rent for break-even, 8% or 10% cash-on-cash, and market risk.
Property & Financing
Operating Expenses (annual $)
Lease Profitability Simulator
10-year projection with rent escalation and expense growth.
Vacancy Risk Calculator
True vacancy cost and risk-adjusted return.
Property Expense Benchmark
Compare your ratios: maintenance, CapEx, tax, insurance → Healthy / Risky / Overleveraged
Portfolio Analyzer
Aggregate 2–20 properties: total return, DSCR, leverage, net worth impact
Properties (add up to 20)

Enter at least 2 properties. Leave value/debt at 0 if unknown; portfolio return uses cash flow only.

Loan & Mortgage
Big financial decisions — conventional, FHA & VA loans with taxes, insurance, PMI/MIP, payoff, refinance and APR views.
1) Property & Loan Basics
2) Program-specific
Conventional — PMI
3) Closing Costs & Cash-to-Close
4) Monthly Ownership Costs
5) Payment Strategy
6) Scenario Settings

Show amounts as:
A) Real Monthly Cost

Payment breakdown
B) Program Cost Impact

C) Cash to Close

D) Loan Summary & Payoff

E) Amortization & Milestones

F) Extra Payments & Biweekly

G) Equity Projection

Chart
Balance & payments over time
Formula: PMT = P × (r(1+r)^n) / ((1+r)^n − 1); r = annual rate/12, n = months
Home & Rent Affordability
Big financial decisions — how much house or rent you can afford: income and debt → max home price or max monthly rent. Combines house affordability, rent affordability, and DTI.
Affordability type
Income & debt
Loan & costs
DTI rule
Reverse: target home price
Comparison
Price tiers
Monthly payment at max price
Required income (target price)
Financial health
Approval strength
Lifestyle impact
Down payment
Income comparison
Budget breakdown
Home Equity & HELOC
Big financial decisions — available equity, Home Equity Loan vs HELOC comparison, costs over time, stress tests, and a clear recommendation.
Your home
Home Equity Loan
HELOC
Best loan payment plan
HELOC draw & repayment
Total cost over time
Net cash & equity
Payment stress test
HELOC sensitivity
Equity vs loan balance
Payment timeline
Recommendation
Rent vs Buy
Big financial decisions — compare average monthly cost of buying vs renting over 1–30 years; break-even and chart
Home purchase
Home rent
Your info
Chart
Average cost by stay length
Staying LengthAverage Buying CostAverage Renting Cost
MonthlyAnnualMonthlyAnnual
Assumptions: fixed-rate fully amortizing mortgage with level payments; investment return is applied to upfront cash as annual compound growth; property tax and insurance grow using the inputs above; tax savings are approximated as (mortgage interest + property tax) × (federal + state marginal rate).
House Flipping Profit
Purchase, repair, sell price, and costs → profit and ROI.
Down Payment
Purchase price and down % → down payment amount.
Closing Cost
Estimate closing costs from purchase price or loan amount.
Price per Square Foot
Price and square footage → $/sq ft (or enter $/sq ft to get price).
1031 Exchange Calculator
Estimate tax-deferred exchange: relinquished and replacement property, boot, and deferred gain.
Relinquished property (sold)
Replacement property (bought)
Investment Calculators

Use these calculators for portfolio growth and active trading. Investment Calculator covers the core investment tool, lump-sum and goal modes, CDs, growth scenarios, investment return, and TVM solver. Trading Calculators helps with position size, risk-reward, trade risk, options profit, P&L, leverage, margin, liquidation price, drawdown, and crypto/currency profit. Journal & Projects includes trade journal, projects, portfolio allocation, dollar-cost averaging, dividend income, and portfolio performance. Search or pick a category below to start.

Tools by category

Investment Calculator
Money growing over time: lump sum, savings goal, CD, or investment growth with recurring contributions and optional inflation
Formulas: Lump sum: FV = PV × (1+r)^n; Recurring: balance each period = balance×(1+r) + contribution; Savings goal: solve for n or PMT in FV of annuity
Where your final value comes from
Growth over time
Year-by-year
YearDepositsInterestEnd balance
Investment Return Calculator
Was this investment good? ROI, IRR, payback, grade, and comparison to market.
TVM Solver
Solve for PV, FV, PMT, N, or I/Y — 5-key time value of money

💡 Use negative values for cash outflows. Leave the field you're solving for blank.

Options Profit & Break-Even
Options trade P&L, break-even, and ROI for calls or puts (simplified, not for real-world risk management).
Position Size (Risk-Based)
Account size, risk per trade, entry and stop → recommended position size.
Trade Risk Overview
Check how much of your account is at risk across open trades (guidance only, not brokerage-grade risk engine).
Trade Profit & Loss
Entry, exit, size, and fees → P&L, return %, and outcome color.
Risk-Reward & Expectancy
Entry, stop, target, and win rate → R-multiple and expectancy per trade.
Leverage & Exposure
Account equity and position size → live leverage and exposure (guidance only).
Margin Requirement
Position size and margin requirement % → required equity and free margin.
Drawdown & Recovery
Peak vs current equity → drawdown %, required return to recover, and suggested risk level.
Currency Profit
Forex/crypto trade P&L in account currency (simplified; ignores swap, funding, and complex pip rules).
Crypto Profit Calculator
Crypto trade P&L: entry, exit, size, and fees in account currency.
Crypto Calculator (Mining, Staking & Tax)
Bitcoin mining profit, staking rewards, and crypto capital gains tax in one tool.
Mining profit
Staking rewards
Crypto capital gains tax
Liquidation Price Calculator
Leveraged or margin position → price at which you get liquidated (simplified).
Trade Journal Summary
Summary stats for your trading journal → win rate, expectancy, and risk insights.
Investing Projects & Playbooks
Lightweight local projects tracker for your trades and investing ideas (saved in your browser only).
Projects are saved locally in this browser only. This is not a brokerage or cloud account.
Portfolio Allocation Planner
Total portfolio value and target weights → per-asset dollar allocations.
Dollar Cost Average Calculator
Multiple entries at different prices → blended average cost and total position.
Dividend Income Planner
Shares and dividend per share → monthly and annual income and yield.
Portfolio Performance & CAGR
Starting value, contributions, and current value → total return and CAGR.
Retirement Calculators

Use these calculators to plan wealth, retirement, and debt payoff. Start Here with Wealth Builder and the 401(k) growth simulator. Plan Your Future with Retirement Architect. Reality Check includes the 4% rule, FIRE calculator, savings rate, net worth benchmark, FI progress, and retirement readiness score. Live on Your Money covers retirement income, withdrawals & longevity, and Social Security break-even. Big Financial Decisions links to home affordability, mortgage, rent vs buy, and HELOC. Stability & Risk uses the Debt Destroyer. Grow & Deploy Capital opens the ROI & Business Analyzer. Advanced includes Compare Strategies. Search or pick a category below to start.

Tools by category

WEALTH BUILDER
Start here — project future balance from savings, monthly contributions, growth presets, fees, and charts (shared assumptions above).
Starting point
Horizon
Growth style

Presets use Expected return and Market benchmark from Adjust Assumptions (Custom uses the field below).

Advanced (fees)

Inflation and tax drag come from ⚙️ Adjust Assumptions above.

Portfolio growth (principal vs growth)
Growth vs contributions
Portfolio value over time
Milestones

Retirement Architect — terms

Definitions for inputs, Advanced Planner fields, optimizer sections (tradeoffs, stress test, recommendations, strategies), and results.

Expected return
Nominal annual investment return you assume before inflation. It drives portfolio growth in the accumulation phase.
Inflation
Annual inflation rate used to translate between nominal dollars and real (purchasing-power) outcomes.
Tax drag
Percentage points subtracted from expected return to approximate taxes and other frictions on growth (not a tax bracket; a simple drag on the rate).
Market benchmark
Return assumption for the comparison (“benchmark”) path on the growth chart. It does not change your plan math unless you use it as a reference line.
Safe withdrawal rate (SWR)
Percentage of your portfolio you plan to withdraw in the first year of retirement (e.g. 4%). Used with spending needs to estimate how large a portfolio must be.
Life expectancy (age)
Last age included in the retirement spending and drawdown projection (longevity horizon).
Retirement age
Age at which you stop working and begin drawing from the portfolio under this plan.
Desired monthly income
Target pretax monthly spending in retirement when not using the replacement-ratio method.
Replacement ratio
Percentage of your pre-retirement income you want to replace in retirement. Used only when “Use replacement ratio” is enabled.
Buffer
Extra monthly dollars added on top of your income target as a cushion.
Simple vs Advanced planner
Simple mode uses total current savings and one monthly contribution. Advanced mode splits balances and contributions across 401(k), Roth IRA, traditional IRA, taxable, and other accounts, with optional employer match, growth rates, and catch-up.
Account balances & contributions (Advanced)
Each bucket has its own balance and monthly employee contribution. The engine rolls them into one accumulation path; total savings and total contributions shown are derived from these fields.
Employer match (% of deferral / % of salary)
Match is modeled as extra dollars to the 401(k): a percentage of your deferral, optionally capped as a percentage of salary. It increases effective savings but follows the simplified rules shown in the form.
Contribution growth (%/yr)
Annual percentage increase applied to employee contributions over time in Advanced mode (e.g. raises or auto-escalation).
Salary growth (%/yr)
Annual growth rate for salary used when match limits depend on salary or when scaling income-based fields.
Catch-up ($/mo)
Optional extra monthly deferral when catch-up is enabled (simplified stand-in for age-50+ additional contributions).
Social Security (% of income)
Estimated Social Security as a percentage of pre-retirement income, used to reduce how much must come from the portfolio.
Social Security claim age
Age at which you begin benefits (62–70 in this model). Before that age in retirement, Social Security is treated as $0; from that age on, the modeled benefit applies and grows with inflation each year.
Pension
Fixed monthly pension income in retirement (not inflation-adjusted in this simplified model unless noted).
Maintenance reserve
Annual housing maintenance allowance as a percentage of income (via the engine’s housing proxy).
Property tax
Annual property tax rate applied to the housing cost proxy (see the note under the inputs).
Insurance ($/yr)
Annual homeowners insurance included in expense load alongside maintenance and property tax.
Monte Carlo
Optional simulation that runs many random return paths to estimate success rates and ending balances.
Trials
Number of Monte Carlo paths run; more trials give smoother statistics but take longer to compute.
Volatility (% annual)
Standard deviation of annual returns used to randomize paths in Monte Carlo (spread of outcomes).
Sequence-of-returns stress
When enabled, stresses early-retirement returns to approximate sequence-of-returns risk (bad markets right when withdrawals start).
Tradeoff explorer
Sliders for retirement age, monthly contribution, and desired spending to preview readiness, FI age, and (after load) Monte Carlo success without changing your main plan until you choose Sync from plan.
Stress test
Checkboxes that layer adverse assumptions (e.g. crash-style path, lower returns, longer life, higher inflation). Stressed success rate uses the same Monte Carlo settings with those overlays applied.
Recommended actions
A short list of changes ranked by estimated impact on Monte Carlo success rate versus your current plan, with a brief rationale for each.
Strategy comparison
Save snapshots of your inputs for this session and compare Monte Carlo success, FI age, and readiness in a table. Saved plans are not stored after refresh.
Preset scenarios (engine)
Conservative, base, and aggressive presets adjust return, inflation, SWR, and maintenance assumptions so you can compare deterministic projections side by side.
Insights
Plain-language notes from sensitivity-style passes on the same engine (e.g. inflation, contributions, retirement age) plus context when Monte Carlo results are available.
Portfolio needed
Estimated nest egg required at retirement to support your spending and withdrawal rule, net of other income sources.
Projected at retirement
Estimated portfolio balance at your retirement age given contributions and return assumptions.
Readiness
Ratio of projected balance to required balance (how close you are to the stated goal).
Years to goal / FI age
Approximate years until the projected balance meets the required portfolio, and the implied financial-independence age when applicable.
First-year withdrawal
Portfolio-funded spending needed in the first retirement year after Social Security and pension.
MC success
Share of Monte Carlo trials where the plan did not deplete under the simulated paths (when Monte Carlo is enabled).
Diagnostics
Summary of net nominal return, real return, gap vs benchmark at retirement, and annual housing-related costs used in the model.
RETIREMENT ARCHITECT
Plan your future — when you can stop working, portfolio vs benchmark, income mix, KPIs, Monte Carlo optional; Simple or Advanced savings detail.
Planning mode
Return assumptions

Nominal return before inflation. Tax drag is percentage points subtracted from expected return (net effective return). Benchmark drives the comparison path only.

Withdrawal & longevity
Lifestyle target
Current position
Safety nets & expense load

Property tax uses a housing proxy: annual property tax ≈ 25% of income × property tax rate (see engine constants).

Monte Carlo simulation
Portfolio needed
$3,244,750
Projected at retirement
$1,063,175
Readiness
33%
Years to goal / FI age
—
First-year withdrawal
$129,790
MC success
—
Plan summary

With these assumptions, the required portfolio is $3,244,750. Your projected balance at retirement is $1,063,175. You may not reach the goal before the retirement age you set — consider higher contributions, a later retirement age, or lower spending. Effective net return (nominal minus tax drag) is about 5.50% per year before inflation. Readiness compares your projected balance to the portfolio implied by your withdrawal rule — currently about 33%.

Tradeoff explorer

Explore retirement age, savings rate, and spending without changing your saved inputs. Use "Sync from plan" to reset sliders.

Preview readiness 33% · Projected at retirement $1,063,175 · FI ~ —
Stress test

Layer adverse assumptions; success rate recomputes with the same Monte Carlo engine (crash = higher volatility + sequence-of-returns ordering).

Strategy comparison

Save the current inputs as a named strategy and compare success rate, FI age, and readiness across scenarios you care about.

Preset scenarios (engine)
ScenarioProjectedRequiredYrs to goalReadiness
conservative$650,162$4,929,118—13%
base$1,063,175$3,244,750—33%
aggressive$1,656,318$2,762,353—60%
Charts
Accumulation vs benchmark
Contributions vs growth
Income sources (first year)
Retirement drawdown
Insights
  • Raising inflation by 1 point would move readiness about -10% (portfolio need vs. projection).
  • Adding about $100/month to contributions moves readiness by roughly +3% under the same return assumptions.
  • Tax drag trims nominal return from 7.0% to an effective 5.5% before real growth.
  • Versus the benchmark path, you end up behind by about $2,309,390 at retirement.
  • Readiness is below 85% of the required portfolio — consider raising contributions or delaying retirement.
Diagnostics
Net nominal 5.50% · Real return 2.50% · Δ vs benchmark -$2,309,390
Property tax / yr $240 · Maintenance reserve / yr $1,545 · Insurance / yr $1,500
Cumulative contributions to retirement $192,000 · Growth from investments $771,175
DEBT DESTROYER
Stability & risk — avalanche or snowball with extra payments: payoff date, interest vs principal, and balance over time.
Debts
NameBalance ($)APR (%)Min. payment ($)
Debt balance over time
Interest vs principal
ROI & BUSINESS ANALYZER
Grow & deploy capital — compare return vs benchmark from initial stake, ending value, years held, and ongoing costs.
Cost vs profit
Value over time
Benchmark
COMPARE STRATEGIES
Decision engine — invest vs pay debt, real estate vs stocks, or retirement ages side-by-side using shared assumptions.
Comparison type

Investment return uses Expected return (%) from ⚙️ Adjust Assumptions (minus tax drag).

Extra $ each month
401(k) Growth Simulator
Start here — project one 401(k)-style account to retirement with match, salary growth, contributions, and inflation.
Balance Over Time
Retirement Income Planner
Live on your money — stack Social Security, pension, annuities, and other income; compare to your target and optional scenarios.
Total retirement income—/ month
Status—
Annual—
Lifetime (to age)—
Income vs target
—
Monthly income by source
Income over time (by age)
Social Security: benefit by claim age (62–70)
Scenario comparison

Add current inputs as a scenario to compare (e.g. SS at 62 vs 70).

Withdrawal & Longevity Planner
Live on your money — model withdrawals, tax-aware order, RMDs, and how long balances last through life expectancy.
—
Age money runs out—
Monthly income supported—
Years supported—
Total lifetime withdrawals—
Balance at life expectancy—
RMD impact—
Longevity—
Portfolio balance over time
Planned withdrawal vs RMD
Annual withdrawal
Account depletion (order: Taxable → Traditional → Roth)
Spending taxable first preserves tax-advantaged growth. Roth last gives most flexibility.
Scenario comparison

Add current inputs as a scenario (e.g. lower withdrawal vs higher).

4% Rule Calculator
Reality check — safe annual and monthly withdrawal from a balance and a flexible rate; see sustainability and longevity.
FIRE Calculator
Reality check — estimate years to FI from savings rate, income, spending, returns, inflation, and a target withdrawal rate.
Savings Rate Calculator
Reality check — savings rate from annual income and annual savings with a simple band label (educational heuristic).
Net Worth Benchmark
Reality check — compare net worth to an age-based expected level (income multiple or fallback curve) with a rough percentile band.
Financial Independence Progress
Reality check — progress toward a 25× annual-expenses financial independence target from current net worth.
Retirement Readiness Score
Reality check — projected savings at retirement vs an income-based target using growth and ongoing contributions (heuristic score 0–100).
Social Security Break-Even Calculator
Live on your money — compare claiming ages and cumulative lifetime Social Security benefits (break-even style).
Tech Tools

Use these tools for display, color, encoding, and web utilities. Display & Viewport covers screen resolution, browser info, user agent parsing, safe areas, WebP support, PPI, aspect ratio, typography, CSS units, font pairing, file size, and favicon validation. Color Tools helps with color conversion, nearest color names, picker, palettes, gradients, and image-to-palette. Encode & Decode handles Base64, URL, HTML, and Unicode. QR & Barcode generates QR and barcode images. Network includes subnet calculator and bandwidth. Networking / Web Tools offers DNS lookup (A, AAAA, TXT, MX) and CDN checker. AI & LLM offers token counter, AI cost calculator, prompt token simulator, context visualizer, and embedding cost calculator. All tools run in the browser. Search or pick a category below to start.

Tools by category

Screen Resolution Checker
Your current display resolution and pixel density (read-only)
Browser Info
Detected browser, platform, and capabilities
User Agent Parser
Decode a user agent string into browser, OS, engine, and device details
Viewport Size
Current browser window size (updates on resize)
Safe Area Checker
Measure viewport safe-area insets and the usable content zone for notches and rounded corners
WebP Support Checker
Check current browser compatibility for WebP and get fallback / conversion hints
Screen Size / PPI Calculator
Compute PPI from resolution and diagonal, or size from PPI
Aspect Ratio Calculator
Width and height → simplified ratio, decimal, and common name. Or pick a ratio and one dimension to get the other.
From target ratio
File Size Calculator
Estimate uncompressed image or video size from resolution, bit depth, and (for video) FPS and duration.
Favicon Size Checker
Validate favicon and app icon sizes against common browser, Apple touch, and PWA recommendations
Responsive Viewport Tester
Test a URL at preset or custom viewport widths in an iframe
Many sites block being embedded (CSP / X-Frame-Options). Use your own site, localhost, or a URL that allows framing (e.g. example.com).
Favicon Generator
Create favicons from an image (resized) or from text; download common sizes
Pixel Ruler
On-screen ruler to measure pixels. Toggle horizontal/vertical and drag to position.
Click "Show ruler" to display a draggable ruler overlay. Use it to measure elements on the page.
Grid Overlay Generator
Generate a column grid (CSS or visual overlay) with configurable columns, gutter, and margin
Typography Converter
Convert between px, pt, and em (16px base)
Result
—
CSS Unit Converter
Convert between px, rem, em, vw, and vh using custom base font size and viewport dimensions
Font Pairing Suggestions
Suggest popular heading + body font combinations for product, editorial, elegant, or technical layouts

Get fonts: Google Fonts — search by name to add to your project.

IP Subnet Calculator
IPv4 & IPv6 subnet analysis — network, broadcast, host range, and binary breakdown
Color Code Converter
Paste any color format — get HEX, RGB, HSL, HSV, CMYK with copy and live preview
Recent colors
Palette
Contrast (WCAG)
Color Namer
Convert a HEX or CSS color to the nearest named color match
Contrast Checker
Check WCAG contrast ratio between foreground and background colors
Accessible Color Palette
Generate WCAG-compliant color palettes from a base color
Color Temperature
Convert between Kelvin and RGB (black-body style approximation)
Color Blindness Simulator
Preview how a color appears under common color-vision deficiencies
Color Picker (Eyedropper)
Pick a color from your screen using the browser eyedropper
Color Palette Generator
Generate full palettes from a base color or random: complementary, triadic, analogous, or monochromatic
Base Color
#3B82F6
Gradient Generator
Build linear or radial CSS gradients with color stops — copy CSS
Gradient to CSS / Tailwind / SVG
Export a gradient as CSS, Tailwind arbitrary value, or SVG linearGradient

Use the SVG block inside <defs> and reference with url(#id).

Image → Color Palette
Upload an image to extract dominant colors (palette). Max 5 MB.
Encoders & Decoders
Encode and decode text instantly. All processing happens locally.
QR Code Generator
Enter text or URL to generate a QR code image
Barcode Generator
Generate Code 128 barcode from text or numbers
Bandwidth Calculator
Data size and speed → time to download; or size and time → required speed
DNS Lookup
View DNS records (A, AAAA, TXT, MX) via DNS over HTTPS
CDN Checker
Check which CDN a site uses (from response headers)
Token Counter (OpenAI, Claude)
Estimate token counts for OpenAI and Claude from text (character/word-based approximation)
AI Cost Calculator
Estimate API cost from input/output token counts for OpenAI and Anthropic models
Prompt Token Simulator
Simulate prompt + completion token cost for a single request
LLM Context Visualizer
Show token distribution and counts for prompt text
Embedding Cost Calculator
Estimate cost for text embedding API by token count
Text Tools

Use these tools to analyze, format, and transform text. Count & Analyze covers word and character counts, line count, reading time, and keyword density. SEO & Writing includes sentence and paragraph counters, keyword extractor, n-grams, and readability (Flesch-Kincaid). Format & Case helps with case conversion, reverse text, trim and normalize spaces and line endings. Text Transformation converts to camelCase, snake_case, and kebab-case. Clean & Strip removes duplicates, empty lines, numbers, special chars, and HTML tags. Find & Replace replaces text and adds prefixes or suffixes. Sort & Lines sorts, reverses, and shuffles lines. Extract & Compare extracts emails, URLs, numbers, hashtags, mentions, domains, and compares two texts. Content Formatting converts between comma, bullet, and numbered lists. Programming Text offers JSON escape, SQL formatter/minifier, YAML formatter, and Markdown preview/converter. Encode & Convert converts text to binary, ASCII, Unicode, emoji names, and Morse. URL & Slug creates and cleans URL-friendly slugs. All processing runs in the browser and stays private. Search or pick a category below to start.

Tools by category

KM to Miles converter

This conversion shows up everywhere from homework to construction: kilometers on one side, miles on the other. Below you’ll find a short formula (linear, via meters), a few concrete examples, and the live converter with Kilometer → Mile preselected.

Typical uses: Road distances and running or cycling events.

The conversion factor

Multiply kilometers by 0.621371 to get miles (one Kilometer moves 0.621371 Mile at a time).

In the calculator strip below, the formula line shows the same relationship live for whatever value you enter.

Examples at road-trip scale

  • 1 km = 0.621371 mi
  • 5 km = 3.106856 mi
  • 26.2 km = 16.279925 mi

How to use the converter

  1. Confirm Kilometer and Mile in the dropdowns (already selected for this page).
  2. Type a new value anytime — the result updates without a separate “calculate” step.
  3. For other units, open the full length converter or pick a related conversion below.

Related links

Formularesult = value × (0.001)
Quick Reference — Common Conversions
1 m
= 3.281 ft
1 km
= 0.621 mi
1 in
= 2.54 cm
1 mi
= 1.609 km
1 yd
= 0.914 m
1 nautical mile
= 1.852 km
Recent conversions
No recent conversions
Developer Tools

Use these tools for data, IDs, web, security, and code. JSON formats, validates, diffs, and inspects JSON. Data Formats handles CSV, XML, YAML format, validation, and conversion. IDs & Generators generates UUIDs, Nano IDs, and random hex. Web & HTTP parses URLs, query strings, and headers and builds HTTP requests. Security offers password generator, hashes, checksums, HMAC, and JWT inspector. Regex tests regex and provides cheat sheet and common patterns. Time converts Unix timestamps and ISO 8601. Code diffs, beautifies, minifies, and escape/unescape. Conversion converts number bases and byte array ↔ string. Inspect parses Base64 images and data URIs. Reference lists HTTP status codes, MIME types, and ports. All tools run in the browser. Search or pick a category below to start.

Tools by category

History
Favorites

Your starred tools grouped by category.

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