Calculators

Free online calculators that run entirely in your browser: percentage, age, BMI, dates and standard deviation. No sign-up, nothing uploaded, no waiting.

Percentage Calculator Free percentage calculator. Work out what percent of a number, what percentage one number is of another, percentage increase or decrease, and add or subtract a percentage.
Age Calculator Free age calculator. Enter a date of birth and get an exact age in years, months and days, the total in weeks and hours, and how long until the next birthday.
BMI Calculator Free BMI calculator in metric and imperial units. Get your body mass index, the WHO category it falls in, and the weight range that would be healthy for your height.
Date Calculator Free date calculator. Work out the days between two dates, including working days, or add and subtract days, weeks, months and years from any date.
Standard Deviation Calculator Free standard deviation calculator. Paste a list of numbers and get the mean, median, mode, range, variance and both the population and sample standard deviation.
Time Calculator Free time calculator. Add and subtract hours and minutes, work out the time between two moments with breaks deducted, and see the total in decimal hours for a timesheet.
Calorie Calculator Free calorie calculator. Work out your basal metabolic rate and daily calorie needs with the Mifflin-St Jeor equation, plus targets for losing or gaining weight at a steady pace.
Compound Interest Calculator Free compound interest calculator. See what a starting amount and regular deposits grow into, choose how often interest compounds, and find the year your earnings overtake everything you put in. No currency is assumed.
Loan Calculator Free loan calculator. Enter an amount, an annual interest rate and a term to get the monthly payment, the total you will repay and how much of it is interest.

The arithmetic runs in your browser. Nothing you type is sent anywhere and nothing is stored, so you can use these with real numbers.

Wikipedia — Calculator
Wikipedia — Percentage
Wikipedia — Body mass index
Wikipedia — Standard deviation
Wikipedia — Gregorian calendar