Age calculator — exact years, months and days
Enter a date of birth and get the exact age in years, months and days, plus total days, the weekday you were born, and the countdown to your next birthday. It computes in your browser (0 uploads, works offline).
How to use it
- Enter the dates or values in the fields above.
- The result and a plain-language explanation appear instantly.
- Copy or Download the result.
FAQ
How do I calculate exact age from a date of birth for free?
Enter the date of birth and the tool returns the exact age in years, months and days as of today — computed in your browser with no upload. It uses real calendar months, so February and leap years are handled correctly rather than approximated as 30-day months.
Does it handle leap years?
Yes. A leap-day birthday and any span crossing 29 February are counted using the real number of days in each month, so the age is exact, not a 365-day approximation.
Is my date of birth uploaded?
No. The calculation runs entirely on your device and nothing is stored — it works with your Wi-Fi off.
Can I calculate age as of a specific date?
Yes — set the "Age as of" field to any date, which is useful for eligibility cut-offs on forms and admissions.
Limits
Works for dates entered as YYYY-MM-DD. Times of day are not considered — age is counted in whole days.
Related
The date difference tool measures any two dates; date + N days finds a deadline from a start date.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.