Calculators

Enter a date of birth to see age in years, months, days, hours, minutes, and seconds. Optionally compute age at any past or future date.

Calculate your Body Mass Index (BMI) in metric or imperial units. Shows category and healthy weight range for your height.

Calculate your weighted GPA across any number of courses. Supports 4.0, 4.3, and 5.0 letter-grade scales plus 0-100 percentage.

Every percentage calculation in one place: X% of Y, X is what % of Y, change from A to B, add/subtract %, add tax. Runs entirely in your browser.

Calculate tip amount, total, and per-person split for any bill. Presets for 10 / 15 / 18 / 20 / 25%. Optional round-up to the nearest dollar.