Calculators

Percentages (a percent of a number, what percent one number is of another, and percentage change), tip and bill splitting, discounts with optional sales tax, loan and mortgage payments, age and the time between two dates, BMI in metric or imperial units, and a converter for length, weight, temperature and volume.

Yes. The open calculator is kept in the page address, for example /calculators#loan or /calculators#bmi, so you can bookmark or share it.

Any. The tip, discount and loan calculators work with plain amounts and show two decimal places, so they suit dollars, euros, pesos or anything else.

With the standard formula for a fixed-rate loan repaid in equal monthly payments, which is how most mortgages and car loans work. The yearly rate is split evenly across the twelve months. Fees, insurance and property taxes aren't included, so a lender's quote may be a little higher.

In whole calendar years, months and days, the way people usually say their age. The end date isn't counted as an extra day. Someone born on 29 February has their birthday on 28 February in years that aren't leap years.

BMI is a quick screening number for adults, using the World Health Organization's categories. It doesn't tell muscle from fat and doesn't apply to children, teens or pregnancy, so treat it as a rough guide and talk to a doctor about your health.

No. Every calculation happens in your browser, and nothing you enter leaves your device.