Every calculation.
One home.
EMI, BMI, GPA, GST, age, unit conversions and dozens more — free, fast, and calculated right in your browser. No sign-up, nothing uploaded.
What people are calculating right now
Percentage Calculator
Free Percentage Calculator online. Find percentages, percentage increase, percentage decrease, and percentage change quickly and accurately.
Scientific Calculator
Free Scientific Calculator online with trigonometric, logarithmic, exponential, and memory functions. Fast, accurate, and easy to use.
EMI Calculator
Free EMI Calculator. Calculate your monthly loan EMI, total interest, total repayment, and amortization schedule quickly and accurately.
SIP Calculator
Free SIP Calculator. Calculate monthly SIP returns, future investment value, total investment, and estimated wealth instantly.
BMI Calculator
Free BMI Calculator to calculate your Body Mass Index (BMI) using your height and weight. Check your healthy weight range instantly.
Calorie Calculator
Free Calorie Calculator to estimate your daily calorie needs for maintaining, losing, or gaining weight based on your age, height, weight, and activity level.
Age Calculator
Free Age Calculator. Find your exact age in years, months, days, hours, and countdown to your next birthday quickly and accurately.
Unit Converter
Free Unit Converter to convert length, weight, temperature, area, volume, speed, and other measurement units quickly and accurately.
Password Generator
Free Password Generator to create strong, secure, and random passwords with customizable length, symbols, numbers, and character options.
Popular calculators
Percentage Calculator
Free Percentage Calculator online. Find percentages, percentage increase, percentage decrease, and percentage change quickly and accurately.
GPA Calculator
Free GPA Calculator to calculate your Grade Point Average online. Convert letter grades and credit hours instantly with accurate results.
Scientific Calculator
Free Scientific Calculator online with trigonometric, logarithmic, exponential, and memory functions. Fast, accurate, and easy to use.
EMI Calculator
Free EMI Calculator. Calculate your monthly loan EMI, total interest, total repayment, and amortization schedule quickly and accurately.
SIP Calculator
Free SIP Calculator. Calculate monthly SIP returns, future investment value, total investment, and estimated wealth instantly.
Compound Interest Calculator
Free Compound Interest Calculator. Calculate compound interest, future value, investment growth, and returns with daily, monthly, or yearly compounding.
ROI Calculator
Free ROI Calculator. Calculate Return on Investment (ROI), investment gain, ROI percentage, and annualized return instantly.
GST Calculator
Free GST Calculator to add or remove GST from any amount instantly. Calculate GST at 5%, 12%, 18%, and 28% with accurate results.
BMI Calculator
Free BMI Calculator to calculate your Body Mass Index (BMI) using your height and weight. Check your healthy weight range instantly.
BMR Calculator
Free BMR Calculator. Calculate your Basal Metabolic Rate (BMR), resting calorie burn, and estimated daily calorie requirements accurately.
Calorie Calculator
Free Calorie Calculator to estimate your daily calorie needs for maintaining, losing, or gaining weight based on your age, height, weight, and activity level.
Age Calculator
Free Age Calculator. Find your exact age in years, months, days, hours, and countdown to your next birthday quickly and accurately.
Date Difference Calculator
Free Date Difference Calculator. Calculate the exact difference between two dates in days, weeks, months, and years quickly and accurately.
Unit Converter
Free Unit Converter to convert length, weight, temperature, area, volume, speed, and other measurement units quickly and accurately.
Binary / Hex / Decimal Converter
Free Binary, Octal, Decimal, and Hexadecimal Converter. Convert number systems quickly and accurately online.
Split Bill Calculator
Free Split Bill Calculator to split bills evenly among any group, calculate tips, and find each person's share instantly.
Password Generator
Free Password Generator to create strong, secure, and random passwords with customizable length, symbols, numbers, and character options.
Random Number Generator
Free Random Number Generator to generate random integers within any range, with optional no-repeat mode and customizable settings.
Browse by category
Every calculator on Calcy lives in one of these eight modules.
Basic Math
Percentages, averages, GPA and everyday arithmetic.
3 toolsScientific
Full-function scientific keypad for advanced work.
3 toolsFinance
Loans, EMI, SIP, interest, tax and ROI.
7 toolsHealth & Fitness
BMI, calories, body fat and daily wellness math.
6 toolsDate & Time
Age, countdowns, durations and working-day counts.
5 toolsConverters
Units, number bases and currency.
3 toolsEveryday
Bills, fuel cost, splitting the check and more.
5 toolsDeveloper Tools
Generators every builder reaches for.
3 toolsTrusted for the numbers that matter
"I use the GST and EMI calculators every week for client quotes. Fast, clean, no ads shouting at me."
"The GPA and date-difference calculators saved me during registration week. Bookmarked the whole site."
"I send clients the BMR and calorie calculators directly — they're simple enough that nobody needs a walkthrough."
Built to be the fastest way to get a number
Calcy started as a simple idea: calculators shouldn't need an account, a download, or a five-second ad before you see your answer. Every tool on this site runs entirely in your browser — your inputs are computed on your device and never uploaded anywhere. The catalog is organized into eight categories covering math, science, finance, health, dates, conversions, everyday life and developer tools, with new calculators added regularly.
Common questions
Yes. Every calculator on Calcy is free and works without an account. There's nothing to install and nothing to pay for.
No. Every calculation runs in your browser using JavaScript — your numbers, dates and inputs never get sent to a server.
Yes — Calcy is built mobile-first and works on any modern phone, tablet or desktop browser.
Regularly. Calcy's calculator list is config-driven, so new tools ship as fast as they're written.