Free online calculators

Work out your body mass index from height and weight, in metric or US units.

Estimate how many calories your body burns at complete rest.

Estimate the calories you burn in a day and the intake for losing, keeping or gaining weight.

Estimate body fat percentage from a few tape measurements.

Find your exercise heart rate zones from your age and resting pulse.

Turn a distance and finish time into pace per kilometer and per mile.

Estimate the most weight you could lift once from a set you have already done.

Estimate a daily fluid target from your weight and how long you exercise.

Find bedtimes or wake-up times that line up with complete sleep cycles.

Estimate your due date from the first day of your last menstrual period.

Count the days between two dates.

Find the date a number of days, weeks, months or years before or after another date.

Calculate exact age from a date of birth.

Count the weekdays between two dates.

Find out which day of the week any date falls on.

Find the week number of any date.

Count the days until an event, or since it happened.

Work out the monthly payment and total interest on a fixed-rate loan.

Project how an investment grows when interest is earned on interest.

Find the steady yearly growth rate that turns a starting value into an ending value.

Measure the gain or loss on an investment relative to its cost.

Convert a stated interest rate into annual percentage yield.

Work out the tip, the total and each person's share of a bill.

Find the sale price and savings from a percent-off discount.

Find your average cost per share across several purchases.

Solve the three most common percentage questions.

Find the mean, median and mode of a list of numbers.

Average a set of values that do not all count equally.

Find the greatest common divisor and least common multiple of a set of whole numbers.

Convert a fraction to a decimal, a percent and its simplest form.

Find the longest side of a right triangle from the two shorter sides.

Calculate the factorial of a whole number exactly.

Convert length and distance between 9 units.

Convert weight and mass between 8 units.

Convert temperature between Celsius, Fahrenheit and Kelvin.

Convert area between 9 units.

Convert volume and capacity between 11 units.

Convert speed between 5 units.

Convert digital storage between 10 units.

Convert fuel economy between mpg, L/100 km and km/L.