Calculate exact age in years, months and days instantly. 100% free, no sign-up — nothing ever leaves this browser tab.
Age Calculator works out the exact age between a birth date and any reference date (today, by default) — down to the year, month, and day. It's a small tool, but a genuinely useful one for forms, eligibility checks, and general curiosity.
Plenty of forms and applications ask for an exact age rather than just a birth date, and doing that math by hand is easy to get slightly wrong around month and leap-year boundaries. This tool handles the edge cases so the number is always right.
No installs, no accounts — just your browser doing the work.
Scroll up (or tap the button above) to load the tool instantly — no account or install needed.
Add your file, text, or numbers into the tool above.
Sensible defaults are already selected — tweak anything you need.
Your result is generated locally and ready in seconds — no waiting room.
Calculations account for varying month lengths and leap years.
Your dates stay in this browser tab and are never uploaded.
The result updates the moment you pick a date.
Because Age Calculator runs locally, teams handling sensitive data — finance, HR, legal, operations — can use it without the compliance questions that come with uploading documents to a third-party server.
Yes — set a custom 'as of' date to calculate age at any point in time.
Yes, leap-year birthdays are handled correctly.
No. Age Calculator runs entirely in your browser.