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Free Calculators
You'll Ever Need
A curated collection of fast, beautiful, and accurate calculators — all in your browser, all completely free.
116Calculators
7Categories
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Browse by Category
Climate & Sustainability Calculators
Carbon, energy, water & green living.
15 calculatorsUnit & Conversion Calculators
Units, currencies, time zones & measurements.
11 calculatorsDeveloper & Web Tools
Encoding, hashing, JSON, regex & web utilities.
25 calculatorsEducation & Student Calculators
Grades, GPA, percentage & study helpers.
16 calculatorsFinancial Calculators
Loans, investments, tax, salary & money planning.
37 calculatorsHealth & Fitness Calculators
BMI, calories, fitness, pregnancy & medication.
20 calculatorsMath Calculators
Numbers, algebra, geometry & everyday arithmetic.
26 calculatorsMost Popular
BMI Calculator
Check your Body Mass Index and understand your health range.
Health CalculatorBasic Calculator
Standard arithmetic operations for everyday math.
Math CalculatorLoan / EMI Calculator
Calculate monthly payments, total interest, and amortization.
Financial CalculatorLumpsum Investment NEW
Estimate the future value of a one-time investment with compound interest.
Financial CalculatorPercentage Calculator
Calculate percentages, increases, decreases, and ratios.
Math CalculatorSIP vs Lumpsum NEW
Compare a monthly SIP against a one-time lumpsum investment over the same tenure.
Financial CalculatorScientific Calculator
Advanced functions including trigonometry, logarithms, and more.
Math CalculatorStep-Up SIP NEW
Calculate returns for a monthly SIP that increases by a fixed percentage each year.
Financial CalculatorUnit Converter
Convert between length, weight, and volume units easily.
Conversion CalculatorBrowse
Carbon Footprint Calculator
Estimate your yearly CO2 emissions from energy and travel.
Climate CalculatorDiet Carbon & Water Footprint
See the CO2 and water hidden in your weekly diet.
Health CalculatorEV vs Petrol Calculator
Compare EV and petrol running costs and break-even distance.
Climate CalculatorElectricity Cost Calculator
Estimate appliance running cost, units used, and CO2 emissions.
Climate CalculatorFlight Emissions Calculator
Estimate CO2 from your flight by distance and cabin class.
Climate CalculatorFood Waste Impact Calculator
Turn wasted food into money, water, and CO2 lost each year.
Climate CalculatorFuel Cost Calculator
Estimate fuel expense and required volume for trips.
Financial CalculatorHousehold Water Footprint
Add up showers, toilets, laundry, and garden water use.
Climate CalculatorCurrency Converter
Convert international money rates offline in your browser.
Financial CalculatorData Transfer Converter
Convert data sizes and estimate bandwidth upload/download times.
Conversion CalculatorDate Difference
Days, weeks and months between any two dates.
Math CalculatorEpoch Converter
Convert Unix timestamps to calendar dates and vice-versa.
Conversion CalculatorPassword Strength
Test password complexity and generate strong security keys.
Conversion CalculatorRecipe Scaler
Scale cooking ingredients portions up or down easily.
Conversion CalculatorRecipe Scaler & Converter
Scale recipes to any serving size and convert ingredient units.
Conversion CalculatorTemperature Converter
Convert between Celsius, Fahrenheit, and Kelvin in real time.
Conversion CalculatorAspect Ratio
Scale picture sizes and solve for missing proportions.
Math CalculatorBase Converter
Convert numbers between binary, octal, decimal, hex.
Math CalculatorBase64 Encode/Decode
Encode string values into Base64 format or decode them.
Developer CalculatorBase64Url Encode/Decode
URL-safe Base64 (RFC 4648) for tokens and query strings.
Developer CalculatorBinary to Decimal
Convert base-2 binary values to base-10 and vice-versa.
Math CalculatorCSS Gradient Generator
Design gradients visually and copy ready-to-use CSS.
Developer CalculatorCSV to JSON
Convert CSV data to JSON and back, with delimiters.
Developer CalculatorCase Converter
Switch text between camelCase, snake_case, and 7 more.
Developer CalculatorArea Calculator
Compute areas for rectangles, circles, triangles, and more.
Math CalculatorBase Converter
Convert numbers between binary, octal, decimal, hex.
Math CalculatorBinary to Decimal
Convert base-2 binary values to base-10 and vice-versa.
Math CalculatorFinal Exam Score & GPA
Find the exam score and GPA needed to hit your target grade.
Education CalculatorFraction to Decimal
Convert and simplify mathematical fractions to decimals.
Math CalculatorGPA Calculator
Calculate your Grade Point Average from course grades and credits.
Education CalculatorLCM & HCF
Least common multiples and highest common factors.
Math CalculatorMarks Percentage
Calculate exam marks percentage and grades.
Math CalculatorCapital Gains Calculator NEW
Compute short- and long-term capital gains tax on your investments.
Financial CalculatorCompound Interest Calculator NEW
Grow any amount with flexible compounding and contributions.
Financial CalculatorCredit Card Payoff NEW
Find how fast you can clear card balances and the interest saved.
Financial CalculatorCurrency Converter
Convert international money rates offline in your browser.
Financial CalculatorDebt Payoff Calculator
Compare snowball vs avalanche and find your debt-free date.
Financial CalculatorDiscount Calculator
Instantly see savings and final prices after any discount.
Math CalculatorEV vs Petrol Calculator
Compare EV and petrol running costs and break-even distance.
Climate CalculatorElectricity Cost Calculator
Estimate appliance running cost, units used, and CO2 emissions.
Climate CalculatorAge Calculator
Find your exact age in years, months, days, and even seconds.
Health CalculatorBMI Calculator
Check your Body Mass Index and understand your health range.
Health CalculatorBMR Calculator
Calculate resting calories and daily energy needs.
Health CalculatorBody Fat Percentage
Estimate body fat percentage using Navy standards.
Health CalculatorCalorie Calculator
Daily calorie needs based on activity level.
Health CalculatorCalories Burned
Calories burned across 25+ activities.
Health CalculatorDaily Water Intake
Calculate your recommended daily hydration targets.
Health CalculatorDehydration Calculator
Estimate fluid deficit and the water needed to rehydrate.
Health CalculatorArea Calculator
Compute areas for rectangles, circles, triangles, and more.
Math CalculatorAspect Ratio
Scale picture sizes and solve for missing proportions.
Math CalculatorBase Converter
Convert numbers between binary, octal, decimal, hex.
Math CalculatorBasic Calculator
Standard arithmetic operations for everyday math.
Math CalculatorBinary to Decimal
Convert base-2 binary values to base-10 and vice-versa.
Math CalculatorCompound Interest Calculator NEW
Grow any amount with flexible compounding and contributions.
Financial CalculatorDate Difference
Days, weeks and months between any two dates.
Math CalculatorDiscount Calculator
Instantly see savings and final prices after any discount.
Math Calculator