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Calcooly is a set of fast, friendly calculators for money, health, math and everyday life. Free, private, and they work the second you land.
Most popular
BMI Calculator
Check your Body Mass Index in seconds.
Open →Popular🔢Percentage Calculator
Every percentage question, answered.
Open →Popular💸Loan Calculator
See your real monthly payment and total interest.
Open →Popular📅Age Calculator
Know your exact age in years, months and days.
Open →Popular📈Compound Interest Calculator
Watch your savings grow over time.
Open →Popular🔥Calorie Calculator
Estimate the calories your body needs each day.
Open →Popular🤰Due Date Calculator
Estimate your baby's arrival and trimester.
Open →Money & Finance
Loans, savings, discounts and everyday money math.
Loan Calculator
See your real monthly payment and total interest.
Open →🏷️Discount Calculator
Find the final price and how much you save.
Open →Popular📈Compound Interest Calculator
Watch your savings grow over time.
Open →🎯Savings Goal Calculator
Find out how much to save each month.
Open →💼Salary Converter
Switch between hourly, monthly and yearly pay.
Open →Health & Body
Understand your body with quick, private estimates.
BMI Calculator
Check your Body Mass Index in seconds.
Open →Popular🔥Calorie Calculator
Estimate the calories your body needs each day.
Open →💧Water Intake Calculator
How much water should you drink a day?
Open →Popular🤰Due Date Calculator
Estimate your baby's arrival and trimester.
Open →📉Body Fat Calculator
Estimate body fat using the U.S. Navy method.
Open →Math & Numbers
Percentages, ratios and the calculations you keep googling.
Dates & Time
Ages, durations and countdowns worked out for you.
Everyday
The little helpers you reach for again and again.
Private by design
Your numbers never leave your device — every calc runs in your browser.
Genuinely free
No accounts, no paywalls, no trial. Ads keep the lights on.
Actually fast
Static pages built for speed. Answers appear as you type.