Calculators & converters

Quick everyday math and unit conversions.

Four everyday percentage questions answered instantly, each with the formula so you can check the math.

A quick, private BMI check with the WHO adult classification and the weight range considered healthy for your height.

Your precise age on any date, plus total days and weeks lived and which weekday your next birthday falls on.

One converter for everyday and technical units – including decimal (GB) versus binary (GiB) storage sizes.

Type a weight in kilograms and see it in pounds straight away – swap to go the other way.

Screen sizes, clothing, furniture – turn centimetres into inches in a keystroke.

Weather, cooking or science – get °F from °C instantly, with Kelvin one click away.

Race distances, road signs and trip plans – turn miles into kilometres instantly.

Settle the bill in seconds – tip, total and exactly what each person owes.

Deadlines, notice periods and countdowns – count the days or find the date N days from now.