Age Calculator
Enter a date of birth to see your exact age in years, months and days, plus total days lived and the days until your next birthday.
How the age calculator works
The calculator counts the full years between the date of birth and the date you choose, then the remaining full months, then the remaining days. By default the second date is today, so you see your age right now. You can change it to find someone’s age on any past or future date, for example on a school cut-off date or a milestone birthday.
Total days, weeks and months are shown too, together with the number of days until the next birthday. Everything is calculated in your browser, so the dates you enter are never sent to our server.
The formulas
Example: Someone born on 15 June 1990 is 34 years, 6 months and 17 days old on 1 January 2025. That is 34 whole years to 15 June 2024, 6 more whole months to 15 December 2024, and 17 days from 15 December to 1 January.
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Frequently asked questions
How is age calculated in years, months and days?
Count the whole years from the birth date, then the whole months left over, then the remaining days. If the day of the month is smaller than the birth day, the calculator borrows the days of the previous month.
Does the calculator handle leap years?
Yes. It uses real calendar dates, so leap years are included in the total day count.
Can I find an age on a past or future date?
Yes. Change the second date to any date you like, for example a future birthday or an enrolment cut-off date.
What happens if my birthday is today?
Your age updates on the birthday itself and the next birthday shows as one year away.
Is my date of birth stored?
No. The calculation runs in your browser and nothing is sent to our server.
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