Age Calculator

Enter a date of birth to get the exact age in years, months and days. You can also calculate the age on any other date, for example on a school cut-off date or an application deadline.

Date of birth Age on this date

How age is calculated

Age is counted in completed years: you turn one year older on your birthday, not before. The leftover months and days are counted the same way. Someone born on March 15 is "2 months and 5 days" past their birthday on May 20.

Born on February 29?

In years without a February 29, most countries treat the birthday as falling on February 28 or March 1 depending on local law. This calculator counts the new year of age from February 28 in non-leap years, the same rule it uses when adding months to a month-end date. Check local rules if the exact day matters legally.

Uses

Checking eligibility for school entry, sports age groups or retirement plans on a specific cut-off date.
Finding the age of a historical figure on the day of an event.
Counting how many days you have been alive, a fun number to celebrate (10,000 days is about 27 years and 4 months).

Privacy

Your date of birth never leaves your device. The calculation is done by JavaScript in your browser.