Age Calculator
Runs in your browser — your data is never uploaded.
Work out an exact age — in years, months and days, plus total days — as of any date, not just today. Updates instantly as you change either date.
How to use Age Calculator
- 1
Enter the birth date.
- 2
Enter the date to calculate the age as of (defaults to today).
- 3
The result updates automatically.
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Frequently asked questions
How are months and days worked out when the day-of-month differs?+
It counts whole years first, then whole months, then the leftover days — borrowing from the previous month where needed, the same way you’d work out an age by hand. That keeps the result consistent with how people naturally state an age.
Can I use it to count down to a birthday?+
Indirectly — set the birth date and a future “as of” date to see the exact age on that day. For a plain day count between now and any date, the date difference calculator is the more direct tool.
Can I calculate age as of a future or past date, not just today?+
Yes — the "as of" date defaults to today but can be set to any date, useful for calculating age at a specific event.
Is my data uploaded anywhere?+
No. The calculation runs entirely in your browser — nothing is sent to a server.