Age Calculator
Work out an exact age in years, months and days, plus the next birthday.
Your result will appear here as soon as you add some input.
How to use it
- 1Enter your values in the fields above.
- 2The answer and the working appear immediately below.
- 3Check the working to see the formula with your numbers substituted.
About the Age Calculator
Age is counted the way people count it: full years first, then the remaining months, then the days. Borrowing from the previous month uses that month’s real length, so the result is correct across February and across leap years.
The day of the week you were born is worked out from the date itself, not looked up anywhere.
Questions people ask
Is your figures uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your figures never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.