Date & time tool
Age Calculator
Calculate your age in years, months and days from a date of birth, with the next birthday countdown.
Result
Your result will appear here.
Privacy note: most tools process input locally in your browser.
About the Age Calculator
Choose a birth date and optionally a reference date. The tool calculates elapsed calendar years, months and days in your browser.
How to use this tool
Select your date of birth, optionally choose an “as of” date, and click Calculate age.
Example
Example: choose 2000-01-01 and a reference date to see the elapsed calendar age.
Tips for better results
Future birth dates are rejected; use the optional reference date for historical calculations.
Frequently asked questions
Can I calculate age on a past date?
Yes, choose the reference date.
Is my date stored?
No, the calculation stays in your browser.