Calculators

Free online calculators that run entirely in your browser: percentage, age, BMI, dates and standard deviation. No sign-up, nothing uploaded, no waiting.

Math

Dates and time

Finance

Health

By country

The arithmetic runs in your browser. Nothing you type is sent anywhere and nothing is stored, so you can use these with real numbers.

Wikipedia — Calculator
Wikipedia — Percentage
Wikipedia — Body mass index
Wikipedia — Standard deviation
Wikipedia — Gregorian calendar