Calculators
Everyday calculators that answer as you type. Each one shows its formula and a worked example, so you can check the result yourself.
Math calculators
- Percentage CalculatorWork out a percentage of a number, what percent one number is of another, or the whole from a part. Free, instant and private, right in your browser.
- Percentage Change CalculatorFind the percentage increase or decrease between two numbers, or add or subtract a percentage from a value. Free and instant, right in your browser.
- Average CalculatorFind the average (mean), median, mode, sum and range of a list of numbers. Paste a column from a spreadsheet; it's free, instant and private.
Date & time calculators
- Age CalculatorCalculate your exact age in years, months and days from your date of birth, plus total weeks and days and the countdown to your next birthday.
- Days Between DatesCount the days between two dates, in days, weeks, and years, months and days. Choose whether to include the end date; free and instant in your browser.
- Hours CalculatorCalculate the hours and minutes between two times, subtract a break, and get decimal hours for timesheets. Works for night shifts past midnight too.
Finance calculators
- EMI CalculatorCalculate the monthly EMI for a home, car or personal loan, with total interest and a year-by-year repayment table. Works for interest and profit rates.
- Compound Interest CalculatorSee how savings grow with compound interest, with optional monthly deposits and yearly, monthly or daily compounding. Includes a year-by-year growth table.
- Discount CalculatorWork out the sale price after a percentage discount, how much you save, and the real total when two discounts stack. Free and instant in your browser.
Health calculators
- BMI CalculatorCalculate your body mass index (BMI) in metric or imperial units and see the WHO category, including the lower cut-offs WHO suggests for Asian populations.
- Calorie CalculatorEstimate how many calories you burn a day (BMR and TDEE) with the Mifflin–St Jeor formula, plus a rough target to lose or gain weight. For adults.
- Ideal Weight CalculatorFind the healthy weight range for your height based on WHO BMI ranges, with the Devine and Robinson formulas for comparison. Metric or imperial units.
How these calculators work
Every calculation runs on your own device: the numbers and dates you enter are never sent anywhere. Numbers can be typed with a dot or a comma as the decimal separator, and dates are counted in whole calendar days, so results don't change with your time zone.