Every calculator you need,
in one fast place.

51 free tools for money, health, maths and daily life. Everything runs in your browser — nothing you type ever leaves your device.

Popular: Loan EMI BMI Percentage Age SIP

Most used

Loan EMI Calculator Monthly instalment, total interest and a full amortization schedule for any loan. BMI Calculator Body mass index, its category, and the healthy weight range for your height. Percentage Calculator Every common percentage question in one place — of, change, and reverse. Age Calculator Exact age in years, months and days — plus zodiac, birthstone and next birthday. SIP Calculator Project a monthly investment plan, including annual step-ups. Unit Converter Length, weight, volume, area, speed, temperature, data and more. Calorie & TDEE Calculator Daily energy needs from BMR and activity, with targets for losing or gaining. Compound Interest Calculator Grow a lump sum at any compounding frequency and see the year-by-year path.

Finance

Loans, savings, investment and tax

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Loan EMI Calculator Monthly instalment, total interest and a full amortization schedule for any loan. Compound Interest Calculator Grow a lump sum at any compounding frequency and see the year-by-year path. Simple Interest Calculator Interest charged only on the original principal — the straight-line case. SIP Calculator Project a monthly investment plan, including annual step-ups. SWP Calculator Withdraw monthly from a corpus and see how long it lasts. Retirement Calculator How large a corpus you need, and whether your saving rate gets you there.

Health & Fitness

Body composition, energy and training

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BMI Calculator Body mass index, its category, and the healthy weight range for your height. Calorie & TDEE Calculator Daily energy needs from BMR and activity, with targets for losing or gaining. Macro Calculator Split a calorie target into protein, carbs and fat in grams. Body Fat Calculator US Navy tape-measure body fat percentage, plus lean mass. Ideal Weight Calculator Four clinical formulas plus the healthy BMI range for your height. Water Intake Calculator Daily hydration target from bodyweight and exercise duration.

Math & Statistics

Algebra, geometry, stats and number theory

Percentage Calculator Every common percentage question in one place — of, change, and reverse. Statistics Calculator Mean, median, mode, range, variance and standard deviation for a data set. Geometry Calculator Area, perimeter, volume and surface area for common shapes and solids. Ratio Calculator Simplify ratios, scale them, and solve proportions for a missing term. Permutation & Combination Calculator nPr, nCr and factorials, with the ordering distinction made clear. Probability Calculator Single and combined event probability, plus odds conversion.

Date & Time

Ages, durations and working days

Age Calculator Exact age in years, months and days — plus zodiac, birthstone and next birthday. Date Difference Calculator The span between two dates in years, months, days, weeks and hours. Add or Subtract Days Calculator Find the date a given number of days, weeks, months or years away. Working Days Calculator Business days between two dates, excluding weekends and holidays. Time Duration Calculator Add up hours and minutes, or find the gap between two clock times.

Converters

Units, bases and data sizes

Unit Converter Length, weight, volume, area, speed, temperature, data and more. Temperature Converter Celsius, Fahrenheit and Kelvin, all at once. Cooking Measurement Converter Cups, spoons, grams and millilitres, with ingredient-aware weights.

Everyday

Bills, fuel, energy and shopping

Fuel Cost & Mileage Calculator Trip cost, fuel economy in every common unit, and cost per kilometre. Electricity Cost Calculator What an appliance costs to run per day, month and year. Solar Panel Calculator System size, output and payback period for rooftop solar.

Home & Construction

Materials, paint, tiles and land

Construction Material Calculator Paint, tiles, concrete and bricks for a room or a wall. Land & Room Area Calculator Area in every common unit, from square metres to acres and bigha.

Tech & Media

Screens, files, bandwidth and colour

Aspect Ratio Calculator Simplify a resolution and resize while keeping proportions exact. Data Storage Converter Bits, bytes, kilobytes through petabytes — with the decimal/binary difference shown. Download Time Calculator How long a file takes at a given connection speed. Video & Audio File Size Calculator Estimate file size from bitrate and duration, or the bitrate to hit a size. IP Subnet Calculator Network address, broadcast, usable host range and mask from CIDR. Password Strength Calculator Entropy in bits and how long a brute-force attack would take.

Quick unit conversions

Direct converters with formulas and reference tables

Kilogram → Pound kg→lb Centimeter → Inch cm→in Celsius → Fahrenheit °C→°F Kilometer → Mile km→mi Liter → US Gallon L→gal Foot → Meter ft→m Megabyte → Gigabyte MB→GB Inch → Centimeter in→cm

Also on Android

The same calculators offline, with saved history, favourites and PDF export. The app and this site share the same calculation engine, so the numbers always agree.

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Why these calculators are different

Nothing leaves your browser

Every calculation runs locally in JavaScript. Your salary, your weight, your loan balance — none of it is transmitted, logged or stored anywhere.

Results as you type

There is no submit button and no page reload. Change any input and every figure updates instantly, so you can explore scenarios rather than run one-off sums.

The reasoning, not just the number

Each tool explains the formula behind it and where it breaks down, because a number you do not understand is a number you cannot act on.