Age Calculator

Enter a date of birth and get the exact age in years, months and days, plus total days, weeks and the date of the next birthday.

The date you enter never leaves your browser.

How to use Age Calculator

  1. Pick the date of birth (and an “as of” date if you want a past or future point).
  2. The age updates automatically.

About this tool

The calculator counts full years, months and days between two dates, and also shows the age as total days and weeks — useful for forms that ask for age in specific units.

Frequently asked questions

Why does the “as of” date matter?
By default the age is calculated as of today. Choosing another date lets you find someone’s age at a specific moment, such as a cut-off date.

Related tools

Date Difference Calculator Find the number of days, weeks, months and years between two dates. Time Calculator Add or subtract hours, minutes and seconds. Timestamp Converter Convert Unix timestamps to dates and dates to timestamps.