Age Calculator
Work out an exact age in years, months, and days.
Quick answer: enter your details below and click Calculate Age — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter the birth date as YYYY-MM-DD.
- Enter the date to calculate the age at.
- Click Calculate Age for years, months, and days.
About this tool
Enter a birth date and the date to calculate the age at, and the tool works out the exact age with proper borrowing across months. The default as-of date is 1 November 2026, so you can check an age on a fixed date as well as today.
Frequently asked questions
Can I calculate an age in the past?
Yes. Set the as-of date to any date on or after the birth date.
What does total days lived mean?
The whole number of days between the two dates, ignoring the years-months-days split.