Free Online Calculators

Calculate your monthly loan payment, total interest and total cost from the amount, interest rate and term.

Estimate your monthly mortgage payment including principal, interest, property tax and home insurance.

See how savings and investments grow over time with compound interest and regular contributions.

Work out the tip and split the bill between any number of people. Choose a percentage, round the total up or down, and see what each person owes.

Find the sale price and how much you save from an original price and a discount percentage.

Work out your UK take-home pay after income tax, National Insurance, pension and student loan. 2026/27 rates, England, Wales, NI and Scotland.

Calculate your body mass index from height and weight, with the WHO weight category.

Estimate your daily calorie needs for maintaining, losing or gaining weight using the Mifflin-St Jeor equation.

Estimate body fat percentage from tape measurements using the U.S. Navy method.

Solve the three common percentage problems: percent of a number, what percent one number is of another, and percentage change.

Add, subtract, multiply and divide fractions, with the answer simplified and shown as a decimal.

Calculate standard deviation, variance, mean and count for a set of numbers, for both samples and populations.

Find the mean, median, mode and range of a list of numbers. Paste values separated by commas or spaces and see all four at once, with the count and sum.

Calculate sample and population variance from a list of numbers, with the mean, sum of squared deviations and both standard deviations shown alongside.

Find your exact age in years, months and days from your date of birth, plus total days lived.

Count the days, weeks, months and working days between two dates. Useful for notice periods, project deadlines and working out how long is left.

Calculate your grade point average from course grades and credit hours on a 4.0 scale.

Convert between units of length, weight, temperature, volume, area, speed, time and digital storage.

Convert kilograms to pounds instantly. 1 kg = 2.20462262 lb, with a full table for grams, ounces, stone and tons.

Convert centimetres to inches instantly. 1 cm = 0.393701 in, with a full table for millimetres, feet, metres and yards.

Convert millimetres to inches instantly. 1 mm = 0.0393701 in, with a table covering centimetres, feet and metres.

Convert Celsius to Fahrenheit instantly. °F = °C × 9/5 + 32, with the Kelvin equivalent shown alongside.

Convert litres to US gallons instantly. 1 L = 0.264172 US gal, with imperial gallons, quarts, pints and cups in the table.

Convert feet to metres instantly. 1 ft = 0.3048 m exactly, with inches, centimetres, yards and kilometres alongside.