Age Calculator
Find out exactly how old you are — down to the day. Enter your date of birth and an optional "age at" date to get your age in years, months and days, plus totals in months, weeks, days, hours, minutes and seconds, and a countdown to your next birthday.
🔒 100% private — files never leave your browser
How to use the Age Calculator
- 1 Enter your date of birth.
- 2 Optionally change the "age at" date to calculate age at any moment in history.
- 3 Read your exact age, totals, and the countdown to your next birthday — all updated live.
Frequently asked questions
How is age in years, months and days calculated?
Using calendar arithmetic: complete years first, then complete months, then the remaining days. This matches how age is stated legally and socially, and leap years are accounted for automatically.
Can I calculate age at a past or future date?
Yes. The "age at" date defaults to today but accepts any date — useful for forms, applications, or checking how old someone was on a specific day.
Is my birthday stored or sent anywhere?
No. The calculation happens entirely in your browser — your date of birth never leaves your device.
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