Age Calculator
Find your exact age in years, months and days from your date of birth, plus total days lived.
Enter both dates.
About the Age Calculator
Enter a date of birth to get an exact age broken into years, months and days, along with totals in months, weeks and days, and how long until the next birthday.
Formula
Age is calculated by calendar arithmetic rather than dividing days by 365.25, so leap years and differing month lengths are handled correctly.
Frequently Asked Questions
By counting whole years from the birth date, then whole months, then remaining days — the same way you would count on a calendar. Dividing total days by 365 gives a slightly wrong answer because of leap years.
In non-leap years the birthday is treated as falling on 1 March for the purposes of completing a year, which matches the most common legal convention.
Yes. The second field defaults to today, but you can set any date to find how old someone was, or will be, on that day.
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