The Universal Calculation Engine
The Universal Calculation Engine
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.
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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
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
Clothing Size Converter
Convert between US, EU, and UK clothing sizes
Result
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
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.

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, then copy and paste into Instagram, bios, and social posts
Result
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
Emoji Picker
Click an emoji to copy it

Click to copy

Hundreds of fast, free calculators, converters, and practical tools for work and everyday life

A universe of useful calculators and tools

Explore hundreds of free calculators, converters, and practical utilities for finance, real estate, business, math, engineering, text, and development — all in one clean experience.

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