Age Calculator
Find an exact age in years, months and days from a date of birth.
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About this tool
Enter a date of birth and this calculator works out the exact age in years, months and days as of today — or as of any date you choose. It also shows the total number of days lived, which is handy for milestones and birthday countdowns.
The calculation accounts for different month lengths and leap years, and runs entirely in your browser.
Frequently asked questions
- How is the age worked out?
- It counts complete years first, then the remaining complete months, then the leftover days, borrowing from the previous month when needed so month lengths and leap years are handled correctly.
- Can I calculate age on a past or future date?
- Yes. Change the "as of" date to any date and the age is calculated relative to that date instead of today.
- What if the date of birth is in the future?
- If the birth date is after the reference date the age is shown as zero — you can't be a negative age.