Age Calculator
Find exact age in years, months and days from a date of birth.
Processed privately on your device
Helpful guidance
Enter a date of birth and optionally choose the date on which age should be measured.
Calendar years and months are counted before the remaining days, while total days use exact UTC date boundaries.
The birthday countdown uses February 28 for leap-day birthdays in non-leap years.
Frequently asked questions
Why is age shown in years, months and days?
Calendar units give a natural exact age rather than an approximate decimal.
Can I calculate age on a past date?
Yes. Change the as-of date to any date on or after the birth date.
How are leap-day birthdays handled?
February 29 birthdays use February 28 as the birthday in non-leap years.
Are dates uploaded?
No. Every calculation runs locally in your browser.