Free online calculators

Find your exact age in years, months and days, the day of the week you were born, and how long until your next birthday.

Count the days, weeks, months and weekdays between two dates.

A live countdown to any date, which you can share with a link.

Work out your body mass index in pounds and inches or in kilograms and centimeters, and see where it falls on the adult…

Estimate how many calories you burn a day, and targets to lose or gain weight gradually.

See a healthy weight range for your height, and what four classic ideal-weight formulas suggest.

Estimate your due date from your last period, conception date or IVF transfer, and see how many weeks pregnant you are.

Type two names and get a just-for-fun love score.

Work out a percentage of a number, what percent one number is of another, and percentage increase or decrease.

Work out the tip and split the bill between friends, with an option to round up.