Age Calculator
Exact age in years, months and days.
- 100% free
- No sign-up
- Runs in your browser
How old, exactly?
Enter a date of birth to get an exact age, the total days you've been alive and how long until the next birthday — plus the day of the week you were born.
Change the second date to find someone's age on any day in the past or future.
- 1
Enter a birth date
Day, month and year.
- 2
Optional: change "age on"
Defaults to today.
- 3
Read the results
Years, months, days and more.
Frequently asked questions
How are leap years handled?
The calculator uses real calendar dates, so 29 February birthdays and leap years are counted correctly.
Why might two calculators disagree by a day?
Some count the end date inclusively. This one counts full days elapsed.
Is my data uploaded anywhere?
No. Everything runs in your browser with JavaScript — nothing you type or open is sent to our servers.