205+ free calculators. Every one shows its work.
Financial, health, math and everyday calculators with the formula and steps shown, a shareable link for every result, local history with no account, dark mode, and zero interstitial ads.
Press Ctrl + K anywhere on the site to jump straight to a calculator.
Click buttons or type directly into the display — ^ for power, ! for factorial, pi/e for constants.
Popular calculators
Mortgage Calculator
Estimate your monthly mortgage payment, including taxes, insurance and HOA.
$2,022.62BMI Calculator
Calculate Body Mass Index and see your weight category.
23.6Percentage Calculator
Find a percentage of a number, what percent one number is of another, or percent change.
30Compound Interest Calculator
See how your savings grow with compounding and optional monthly contributions.
$144,572.72Age Calculator
Calculate exact age in years, months and days from a birth date.
Tip Calculator
Split the bill and calculate the tip per person.
$10.80Calorie Calculator
Estimate your daily calorie needs to maintain, lose or gain weight.
2,598 kcal/dayLoan Calculator
Work out the monthly payment and total interest on any fixed-rate loan.
$488.26Browse by category
Built to fix what other calculator sites get wrong
- ✓ Every result shows the formula and step-by-step work
- ✓ Shareable permalinks — send someone your exact inputs
- ✓ Compare saved scenarios side-by-side, free
- ✓ Dark mode, keyboard-accessible, no interstitial ads
- ✓ No email, no signup, ever — not even to save your history
- ✓ Embed any calculator on your own site, free and unlimited
Every calculation runs entirely in your browser. Nothing you type is ever sent to a server — not your income, not your health numbers, not your mortgage details. No account means there’s nothing about you to store in the first place.