Everyday Maths & Conversions Calculators

Practical calculators for daily life. Work out an exact age, the days between two dates or the time between two clock times, convert units of length, weight, temperature and more, calculate BMI, split a bill with a tip, find speed, distance and time, or generate random numbers.

Age Age CalculatorCalculate your exact age in years, months and days from your date of birth, plus total days lived and a countdown to your next birthday. ⇄ Unit ConverterConvert units of length, weight, volume, area, speed, time, temperature and data storage with exact conversion factors and the working shown. km/h Speed, Distance & Time CalculatorFind speed, distance or time from the other two, in km and km/h or miles and mph, with the formula triangle and a distance–time graph. Graph h:m Time CalculatorWork out the hours and minutes between two times (including overnight), or add and subtract hours and minutes from a clock time. 31 Days Between Dates CalculatorCount the days between two dates, in weeks and days, with the number of weekdays (Monday to Friday). BMI BMI CalculatorCalculate body mass index from weight and height in metric or imperial units, with the adult BMI category and healthy weight range. Graph Tip Tip CalculatorCalculate a tip as a percentage of the bill, the total to pay and each person's share when splitting between friends.