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
Find percentages, percentage change, and what-percent-of-what in seconds.
Scientific Calculator
Trigonometry, logarithms, exponents and memory functions in one keypad.
EMI Calculator
Monthly loan installment, total interest and full amortization total.
SIP Calculator
Future value of a monthly SIP investment with compounding returns.
BMI Calculator
Body Mass Index from your height and weight, with the healthy range.
Calorie Calculator
Daily calorie needs for maintaining, losing or gaining weight.
Age Calculator
Exact age in years, months, days — and days until your next birthday.
Unit Converter
Length, weight and temperature conversions in one tool.
Password Generator
Strong, random passwords with full control over length and characters.
Popular calculators
Percentage Calculator
Find percentages, percentage change, and what-percent-of-what in seconds.
GPA Calculator
Convert letter grades and credit hours into your grade point average.
Scientific Calculator
Trigonometry, logarithms, exponents and memory functions in one keypad.
EMI Calculator
Monthly loan installment, total interest and full amortization total.
SIP Calculator
Future value of a monthly SIP investment with compounding returns.
Compound Interest Calculator
See how principal grows with compounding frequency over time.
ROI Calculator
Return on investment as a percentage and annualized rate.
GST Calculator
Add or remove GST from any amount at common slab rates.
BMI Calculator
Body Mass Index from your height and weight, with the healthy range.
BMR Calculator
Basal metabolic rate — the calories your body burns at rest.
Calorie Calculator
Daily calorie needs for maintaining, losing or gaining weight.
Age Calculator
Exact age in years, months, days — and days until your next birthday.
Date Difference Calculator
Days, weeks and months between any two dates.
Unit Converter
Length, weight and temperature conversions in one tool.
Binary / Hex / Decimal Converter
Convert instantly between binary, octal, decimal and hexadecimal.
Split Bill Calculator
Split a bill evenly (or with tip) across any group size.
Password Generator
Strong, random passwords with full control over length and characters.
Random Number Generator
Random integers in any range, with optional no-repeat mode.
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.