Everyday & Math Calculators

Work out an exact age in years, months and days, plus total weeks, days and the next birthday.

Find the mean, median, mode, range and standard deviation of any list of numbers.

Count the days, weeks, months and business days between two dates — or add a duration to a date.

Find the sale price after one or more discounts, and check what a stacked offer is really worth.

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

Every common percentage question in one place — what is X% of Y, X as a percentage of Y, and percentage change.

Simplify a ratio, scale it to a new total, or solve for the missing term in a proportion.

Add up hours and minutes, work out the time between two clock times, and convert to decimal hours for timesheets.

Work out the tip and split a bill between any number of people, with or without tax included.

Convert length, weight, volume, area, speed and data between metric and imperial units with exact factors.