All tools
The full library
343 calculators and browser-based tools across 18 categories — private and free to use.
AI Tools
8 liveAI Token Counter
Count estimated tokens, characters, words, sentences, and timing for leading AI models.
AI Cost Calculator
Estimate input, output, daily, and monthly API costs from your prompt.
Context Window Calculator
See how much of each model’s context window your prompt uses.
Token Visualizer
Explore a local approximation of how text becomes model tokens.
Prompt Analyzer
Inspect prompt complexity, structure, placeholders, code, and more—privately.
AI Model Comparison
Compare context, output limits, pricing, vision, and tool support.
Prompt Size Estimator
Translate prompt length into words, tokens, pages, and reading time.
AI Pricing Calculator
Forecast monthly API budgets across major AI providers.
Health & Fitness
21 liveBMI Calculator
Body Mass Index from height and weight.
Body Fat Calculator
Estimate body fat with the U.S. Navy method.
Lean Body Mass Calculator
Fat-free mass from height and weight.
FFMI Calculator
Fat-free mass index for athletes.
Ideal Weight Calculator
Reference weight ranges by height.
BMR Calculator
Basal metabolic rate at rest.
TDEE Calculator
Total daily energy expenditure.
Calorie Calculator
Daily calorie needs by activity level.
Calorie Deficit Calculator
Targets for gradual weight change.
Protein Intake Calculator
Daily protein target in grams.
Macronutrient Calculator
Protein, carbs and fat targets.
Water Intake Calculator
Daily hydration target.
Pace Calculator
Pace, distance and finish time.
Heart Rate Zone Calculator
Five training zones from max HR.
Pregnancy Calculator
Weeks pregnant and trimester.
Pregnancy Weight Gain Calculator
Reference weight-gain range by pre-pregnancy BMI.
Due Date Calculator
Estimated due date from LMP.
Pregnancy Conception Calculator
Estimated conception date.
Ovulation Calculator
Estimated fertile window.
Period Calculator
Estimate your next period from cycle length.
Waist-to-Hip Ratio
Body-shape health indicator.
Animal Care & Farm
18 liveCat Pregnancy Calculator
Estimated feline due date.
Cow Gestation Calculator
Estimated calving date.
Dog Pregnancy Calculator
Estimated canine due date.
Goat Gestation Calculator
Estimated kidding date.
Guinea Pig Pregnancy Calculator
Estimated guinea pig due date.
Mare Gestation Calculator
Estimated foaling date.
Llama Pregnancy Calculator
Estimated llama due date.
Rabbit Gestation Calculator
Estimated rabbit due date.
Sheep Gestation Calculator
Estimated lambing date.
Swine Gestation Calculator
Estimated farrowing date.
Cattle Per Acre Calculator
Estimate herd capacity from available forage.
Feed Conversion Ratio Calculator
Feed used per unit of weight gained.
Grain Bin Calculator
Round-bin storage capacity estimate.
Animal Mortality Rate Calculator
Deaths as a percentage of a herd or flock.
Horse Weight Calculator
Estimate adult horse body weight from measurements.
Dog Weight Tracker
Record and compare measured dog weights.
Cat Weight Tracker
Record and compare measured cat weights.
Cattle Weight Calculator
Estimate cattle weight from body measurements.
Finance
16 liveMortgage Calculator
Monthly payment and total interest.
Loan Calculator
Personal loan payment estimate.
Auto Loan Calculator
Car payment estimate.
Payment Calculator
Payment from principal, rate and term.
Amortization Calculator
Full loan amortization schedule.
Compound Interest Calculator
Growth with compounding.
Investment Calculator
Future value of investments.
Retirement Calculator
Retirement savings projection.
Savings Goal Calculator
Time to reach a savings target.
Inflation Calculator
Purchasing power over time.
Salary Calculator
Annual salary from hourly rate.
Hourly-to-Salary Calculator
Hourly rate from annual salary.
Budget Allocation Calculator
Split income into needs, wants, savings.
Net Worth Calculator
Assets minus liabilities.
Debt Payoff Calculator
Time to pay off debt.
Credit Card Payoff Calculator
Payoff time and interest.
Islamic Finance
9 liveGeneral Zakat Calculator
Zakat on combined assets.
Cash Zakat Calculator
Zakat on cash holdings.
Gold Zakat Calculator
Zakat on gold you enter by weight.
Silver Zakat Calculator
Zakat on silver you enter by weight.
Business Zakat Calculator
Zakat on business assets.
Investment Zakat Calculator
Zakat on investments.
Nisab Calculator
Nisab threshold from gold or silver.
Fidya Calculator
Fidya for missed fasts.
Islamic Inheritance Calculator
Organise heirs and estate for Faraid review.
Math
7 livePercentage Calculator
Find percentages and changes.
Fraction Calculator
Add and multiply fractions.
Scientific Calculator
Basic expressions in the browser.
Average Calculator
Mean of a set of numbers.
Ratio Calculator
Split a total by ratio.
Triangle Calculator
Area and perimeter of triangles.
Random Number Generator
Random integers or decimals.
Date & Time
7 liveAge Calculator
Exact age from date of birth.
Date Difference Calculator
Days between two dates.
Date Calculator
Add or subtract days from a date.
Time Duration Calculator
Duration between times.
Hours Calculator
Total hours from time entries.
Business Days Calculator
Weekdays between dates.
Countdown Calculator
Time until a target date.
Education
5 liveUnit Converters
12 liveLength Converter
Meters, feet, miles and more.
Weight Converter
Kilograms, pounds and ounces.
Temperature Converter
Celsius, Fahrenheit, Kelvin.
Area Converter
Square meters, acres, hectares.
Volume Converter
Liters, gallons, cups.
Speed Converter
mph, km/h, m/s, knots.
Energy Converter
Joules, calories, kWh.
Time Converter
Seconds, minutes, hours, days.
Fuel Economy Converter
MPG and L/100km.
Cooking Converter
Cups, tablespoons, milliliters.
Manual Exchange Rate Converter
Convert with a rate you enter.
Data Storage Converter
Bytes, KB, MB, GB, TB.
Home & Construction
18 liveConcrete Calculator
Volume for slabs and footings.
BTU Calculator
Estimate room cooling capacity.
Square Footage Calculator
Find room or project area.
Stair Calculator
Plan risers, treads and run.
Paint Calculator
Liters or gallons needed.
Tile Calculator
Tiles needed for a floor.
Flooring Calculator
Flooring boxes needed.
Gravel Calculator
Gravel volume and tonnage.
Roofing Calculator
Shingle bundles needed.
Wallpaper Calculator
Rolls needed for walls.
Mulch Calculator
Mulch volume for garden beds.
Plant Spacing Calculator
Plan plants from area and spacing.
Compost Calculator
Compost volume for a bed.
Fertilizer Calculator
Product amount from a nutrient target.
Potting Soil Calculator
Potting-mix volume for round pots.
Raised Bed Soil Calculator
Soil mix volume for raised beds.
Vegetable Seed Calculator
Seeds needed for rows and germination.
Vegetable Yield Calculator
Estimate harvest from plant count.
Developer Tools
29 liveUnix Timestamp Converter
Unix time to readable date.
Epoch Converter
Epoch seconds and milliseconds.
Password Generator
Secure random passwords.
Password Strength Checker
Check password strength locally.
Hash Generator
SHA-256, SHA-384, SHA-512.
JSON Formatter
Pretty-print JSON.
JSON Validator
Validate JSON syntax.
JSON Minifier
Compress JSON to one line.
JSON Beautifier
Beautify and indent JSON.
JWT Decoder
Decode JWT header and payload.
UUID Generator
Generate UUID v4.
UUID Validator
Validate UUID format.
Base64 Encoder & Decoder
Encode and decode Base64.
URL Encoder & Decoder
Percent-encode and decode URLs.
HTML Formatter
Indent HTML markup.
CSS Formatter
Format CSS stylesheets.
SQL Formatter
Format SQL queries (never executed).
XML Formatter
Indent XML documents.
YAML Formatter
Clean up YAML formatting.
Regex Tester
Test JavaScript regular expressions.
Markdown Preview
Preview Markdown as HTML.
Cron Expression Parser
Parse cron schedule fields.
Subnet Calculator
Hosts in a CIDR block.
MIME Type Lookup
Common MIME type descriptions.
HTTP Status Code Lookup
HTTP status code meanings.
Color Converter
HEX, RGB and HSL.
QR Code Generator
Make a QR code from text or a URL.
CSV ↔ JSON Converter
Convert tabular data locally.
Text Diff Checker
Compare two pieces of text.
PDF Tools
10 livePDF Tools
Merge, split, sign and convert PDFs.
PDF Merger
Combine PDF files into one document.
PDF Splitter
Split a PDF into individual page files.
PDF Signer
Add a styled name or signature image to a PDF.
PDF to Image Converter
Convert each PDF page to a PNG image.
Image to PDF Converter
Turn multiple images into one PDF.
RTF to PDF Converter
Convert RTF documents to PDF.
RTF to Word Converter
Convert RTF documents to Word.
Word to PDF Converter
Convert Word DOCX documents to PDF.
PDF Text to DOCX
Extract text from a PDF into a Word DOCX file.
Image Tools
2 liveChemistry
29 liveMole Calculator
Convert between moles, particles, and mass.
Molar Mass Calculator
Find molar mass from a chemical formula.
Molecular Weight Calculator
Compute molecular weight of any compound.
Grams to Moles Calculator
Convert a mass in grams to moles.
Moles to Grams Calculator
Convert moles to mass in grams.
Mass Percent Calculator
Find mass percent composition of a compound.
Percent Yield Calculator
Compare actual vs. theoretical yield.
Empirical Formula Calculator
Derive the simplest whole-number ratio.
Molecular Formula Calculator
Find the true molecular formula from empirical data.
Limiting Reactant Calculator
Identify the limiting reagent in a reaction.
Molarity Calculator
Calculate molarity from moles and volume.
Molality Calculator
Express concentration as moles per kilogram.
Normality Calculator
Find normality for acid-base and redox work.
Dilution Calculator
Use C₁V₁ = C₂V₂ to dilute stock solutions.
Solution Concentration Calculator
Convert between common concentration units.
Ideal Gas Law Calculator
Solve PV = nRT for any variable.
Boyle's Law Calculator
Relate pressure and volume at constant temperature.
Charles's Law Calculator
Relate volume and temperature at constant pressure.
Combined Gas Law Calculator
Link P, V, and T when moles are constant.
Gay-Lussac's Law Calculator
Relate pressure and temperature at constant volume.
Dalton's Law Calculator
Find partial pressures in gas mixtures.
Specific Heat Calculator
Compute q = mcΔT for heating or cooling.
Heat Capacity Calculator
Find heat capacity from mass and specific heat.
Enthalpy Calculator
Estimate ΔH from bond energies or Hess's law.
Gibbs Free Energy Calculator
Determine spontaneity with ΔG = ΔH − TΔS.
Electron Configuration Calculator
Write full and noble-gas electron configurations.
Atomic Mass Calculator
Weighted average atomic mass from isotopes.
Isotope Calculator
Compare isotope numbers and neutron counts.
Half-Life Calculator
Model radioactive decay over time.
Physics
35 liveVelocity Calculator
Find velocity from displacement and time.
Speed Calculator
Find speed from distance and time.
Average Speed Calculator
Mean speed over multiple segments.
Acceleration Calculator
Rate of change of velocity over time.
Distance Calculator
Distance from speed and time or SUVAT.
Time Calculator
Time from distance and speed or acceleration.
Free Fall Calculator
Motion under gravity near Earth's surface.
Projectile Motion Calculator
Range, height, and flight time for projectiles.
Force Calculator
Compute force with F = ma.
Weight Calculator
Gravitational weight from mass and g.
Momentum Calculator
Linear momentum p = mv.
Impulse Calculator
Impulse equals change in momentum.
Torque Calculator
Rotational force τ = rF sin θ.
Kinetic Energy Calculator
Energy of motion: KE = ½mv².
Potential Energy Calculator
Gravitational PE = mgh.
Work Calculator
Mechanical work W = Fd cos θ.
Power Calculator
Power as work or energy per time.
Mechanical Energy Calculator
Total KE + PE in conservative systems.
Efficiency Calculator
Output vs. input energy or power.
Ohm's Law Calculator
Relate voltage, current, and resistance.
Voltage Calculator
Find voltage from current and resistance.
Current Calculator
Find current from voltage and resistance.
Resistance Calculator
Resistance from V/I or resistivity.
Electrical Power Calculator
Power in circuits: P = VI = I²R.
Capacitance Calculator
Charge storage Q = CV and parallel-plate C.
Frequency Calculator
Frequency from period or wave speed.
Wavelength Calculator
Wavelength from speed and frequency.
Wave Speed Calculator
Speed of propagation v = fλ.
Period Calculator
Period as the inverse of frequency.
Lens Calculator
Thin-lens equation and magnification.
Mirror Equation Calculator
Spherical mirrors and ray diagrams.
Refraction Calculator
Snell's law and index of refraction.
Pressure Calculator
Pressure as force per unit area.
Density Calculator
Mass per unit volume ρ = m/V.
Buoyancy Calculator
Archimedes' principle and floating objects.
Statistics
29 liveMean Calculator
Arithmetic average of a data set.
Median Calculator
Middle value of sorted data.
Mode Calculator
Most frequently occurring value.
Range Calculator
Spread from minimum to maximum.
Variance Calculator
Average squared deviation from the mean.
Standard Deviation Calculator
Typical distance from the mean.
Quartile Calculator
Q1, Q2, and Q3 for any data set.
Interquartile Range Calculator
IQR = Q3 − Q1 robust spread measure.
Probability Calculator
Basic probability rules and complements.
Binomial Calculator
Binomial probabilities and cumulative counts.
Normal Distribution Calculator
Z-scores and normal CDF probabilities.
Poisson Calculator
Rare events in fixed intervals.
Combination Calculator
n choose k unordered selections.
Permutation Calculator
Ordered arrangements of k from n.
Correlation Calculator
Pearson r between two variables.
Linear Regression Calculator
Best-fit line slope and intercept.
R-Squared Calculator
Coefficient of determination R².
Z-Score Calculator
Standardize values to the z scale.
Z-Test Calculator
One-sample z-test for known σ.
T-Test Calculator
One- and two-sample t-tests.
Chi-Square Calculator
Goodness-of-fit and independence tests.
ANOVA Calculator
One-way analysis of variance F-test.
Sample Size Calculator
Plan n for a target margin of error.
Margin of Error Calculator
MOE from sample size and confidence.
Confidence Interval Calculator
CI for a mean or proportion.
Percentile Calculator
Find the kth percentile of data.
Percent Rank Calculator
Percentile rank of a given value.
Relative Risk Calculator
Risk ratio for cohort studies.
Random Sample Calculator
Draw a simple random sample.
Earth & Weather
20 liveAntipode Calculator
Find the point on Earth directly opposite any location.
Latitude Longitude Distance Calculator
Great-circle distance between two coordinate pairs.
Azimuth Calculator
Initial bearing between two coordinates.
Great Circle Distance Calculator
Shortest path distance over a sphere.
Sunrise Sunset Calculator
Approximate sun times for a location and day.
Moon Phase Calculator
Moon phase and illumination for a date.
Wind Chill Calculator
Feels-like temperature with wind (US formula).
Heat Index Calculator
Apparent temperature from heat and humidity.
Dew Point Calculator
Dew point from temperature and humidity.
Humidity Calculator
Relative humidity from temp and dew point.
Rainfall Calculator
Rain volume from area and depth.
Rain to Snow Calculator
Convert liquid rain to snow depth.
Snowfall Calculator
Snow depth from liquid equivalent.
UV Index Calculator
Estimated UV index from sun angle.
Sunburn Time Calculator
Minutes to burn by skin type and UV.
Sun Exposure Calculator
UV dose from UV index and duration.
Growing Degree Days Calculator
Heat accumulation for crops.
Frost Date Calculator
Estimate first frost day of year.
Air Density Calculator
Density from temperature and pressure.
Atmospheric Pressure Calculator
Pressure at altitude above sea level.
Food & Cooking
68 liveButter Calculator
Convert butter between cups, grams, and sticks.
Butter Stick Converter
Convert butter sticks to grams or cups.
Cake Pan Converter
Scale a recipe between pan sizes.
Cooking Measurement Converter
Convert cups, tablespoons, and teaspoons.
Cups to Pounds Converter
Convert cups of an ingredient to pounds.
Pounds to Cups Converter
Convert pounds of an ingredient to cups.
Cups to Grams Converter
Convert cups to grams for baking.
Grams to Cups Converter
Convert grams to cups for baking.
Grams to Tablespoons Converter
Convert grams to tablespoons.
Grams to Teaspoons Converter
Convert grams to teaspoons.
mL to Grams Calculator
Convert milliliters to grams by density.
Oil to Butter Converter
Substitute oil for butter in recipes.
Rice Conversion Calculator
Convert raw rice to cooked volume.
Pasta Conversion Calculator
Convert dry pasta to cooked weight.
Herb Conversion Calculator
Convert fresh herbs to dried.
Garlic Conversion Calculator
Convert garlic cloves to teaspoons.
Yeast Converter
Convert between yeast types.
Coffee Calculator
Ground coffee for multiple servings.
Coffee Ratio Calculator
Coffee-to-water brew ratio.
Coffee to Water Ratio Calculator
Find water for a coffee dose.
Cold Brew Ratio Calculator
Coffee and water for cold brew.
Tea Brewing Calculator
Tea leaves for water volume.
Coffee Caffeine Calculator
Estimate caffeine from coffee dose.
Coffee Footprint Calculator
Estimate environmental impact of coffee.
Alcohol by Volume Calculator
Calculate ABV from gravities or proof.
Alcohol Dilution Calculator
Dilute spirits to a target ABV.
Chilled Drink Calculator
Estimate dilution from melting ice.
Cocktail Ratio Calculator
Split a cocktail into ingredient parts.
Wine SO₂ Calculator
Potassium metabisulfite addition for wine.
Priming Sugar Calculator
Homebrew bottle carbonation sugar.
Baker's Percentage Calculator
Express ingredients as % of flour.
Cake Pricing Calculator
Price a custom cake order.
Cake Serving Calculator
Servings from cake dimensions.
Pancake Recipe Calculator
Scale pancake batter ingredients.
Ice Cream Calculator
Base mix for homemade ice cream.
Donut Calculator
Donuts from batch dough weight.
Chocolate Calculator
Chocolate needed for a recipe.
Self-Rising Flour Calculator
Make self-rising flour at home.
Sourdough Calculator
Hydration and starter feeding.
Pizza Calculator
Pizza dough ingredient amounts.
Pizza Party Calculator
Pizzas needed for a crowd.
Pizza Size Calculator
Area of a pizza by diameter.
Pizza Comparison Calculator
Compare two pizza sizes.
BBQ Grill Size Calculator
Grill cooking surface area.
BBQ Party Calculator
Meat needed for a BBQ.
Party Drink Calculator
Drinks needed for an event.
Popcorn Calculator
Kernels for desired popcorn volume.
Taco Bar Calculator
Plan a taco bar for a crowd.
Wedding Alcohol Calculator
Bottles needed for a wedding.
Ham Per Person Calculator
Ham weight for a gathering.
Rice to Water Ratio Calculator
Water for a rice volume.
Egg Boiling Calculator
Boiling time for eggs.
Ideal Egg Boiling Calculator
Adjust egg time for altitude.
Steak Cooking Time Calculator
Pan or grill time by thickness.
Turkey Cooking Time Calculator
Roasting time by turkey weight.
Turkey Defrost Time Calculator
Safe thaw time for turkey.
Turkey Size Calculator
Turkey weight for guest count.
Water Cooling Calculator
Mix hot and cold water.
Salad Calories Calculator
Estimate salad calorie total.
Mashed Potatoes Per Person Calculator
Potatoes for a crowd.
Brine Calculator
Salt brine for wet curing.
Bacon Curing Calculator
Dry cure salt and sugar for bacon.
Bread Spread Calculator
Butter or spread for servings.
Sulfur Calculator
SO₂ additions for winemaking.
Food Storage Calculator
Estimated safe storage duration.
Recipe Scaling Calculator
Scale any ingredient amount.
Ingredient Substitution Calculator
Convert substitute amounts.
Meal Prep Calculator
Portions and batches for meal prep.