Every calculator you need,
in one fast place.
110 calculators and 234 unit converters for money, health, maths and daily life.
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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
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
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.
Mathematics
Algebra, geometry, powers and number theory
Percentage Calculator Every common percentage question in one place — of, change, and reverse. Geometry Calculator Area, perimeter, volume and surface area for common 2D shapes and 3D solids. Ratio Calculator Simplify ratios, scale them, and solve proportions for a missing term. GPA Calculator Credit-weighted grade point average on the standard 4.0 scale. Number Base Converter Convert between binary, octal, decimal and hexadecimal. Scientific Calculator A full expression calculator with functions, constants and precedence.
Statistics & Probability
Distributions, inference and correlation
Z-Score Calculator How many standard deviations a value sits from the mean, and the percentile that implies. Normal Distribution Calculator Probabilities under a bell curve — below, above or between two values. Binomial Distribution Calculator The chance of k successes in n independent trials, exactly or cumulatively. Confidence Interval Calculator The range a population mean is likely to fall in, using the t-distribution for small samples. Margin of Error Calculator The ± figure quoted with a survey result, from its sample size and confidence level. Sample Size Calculator How many responses a survey needs for a given margin of error and confidence level.
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. Unix Timestamp Converter Converts epoch time to a readable date and back, detecting seconds, milliseconds or microseconds.
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. Cups to Grams Converter Converts cups to grams for a specific ingredient, because a cup of flour and a cup of honey are not the same weight.
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. Speed, Distance & Time Calculator Solve for whichever of speed, distance or time you are missing.
Home & Construction
Materials, paint, tiles and land
Physics
Motion, energy, electricity and gases
Ohm’s Law Calculator Solves voltage, current, resistance and power from any two of them. Kinetic Energy Calculator The energy of a moving object, ½mv², in joules — and why doubling speed quadruples it. Potential Energy Calculator Gravitational potential energy, mgh, and the speed it becomes if the object falls. Momentum Calculator Linear momentum, p = mv, plus the impulse needed to stop it in a given time. Force Calculator Newton’s second law, F = ma, with the weight of the same mass for comparison. Acceleration Calculator Acceleration from a change in speed over a time or a distance, with the full motion solved.
Tech & Media
Screens, files, bandwidth and colour
Aspect Ratio Calculator Simplify a resolution and resize while keeping proportions exact. Data Storage Converter Bits and bytes through petabytes, in both decimal (GB) and binary (GiB) — side by side, never mixed. 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
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.
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.