Calculators

Free online calculators

Fast, accurate calculators for everyday questions. Results update as you type, and every calculator shows the numbers clearly so you can check them.

• Age Calculator: exact age in years, months and days on any date, total days lived and the countdown to your next birthday. Useful for application forms that ask for age on a cut-off date.
• Percentage Calculator: X% of Y, what percent one number is of another, and percentage increase or decrease, for discounts, tax, marks and growth.

Accurate by design

The age calculator accounts for leap years and months of different lengths. The percentage calculator handles decimals and negative numbers and shows percentage change against the original value, the standard way to measure growth. More calculators are on the way. Tell us which one you need next.