Free Age Calculator
Find your exact age down to the day — calculated locally in your browser.
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Years
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Months
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Days
Total days lived: —
Total weeks lived: —
Next birthday: —
How to calculate age
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1
Enter the date of birth
Pick the birth date using the date field.
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2
Optionally change the "as of" date
Defaults to today - change it to see age at a past or future date instead.
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3
Read the breakdown
Age in years/months/days, total days and weeks lived, and the next birthday all update instantly.
Example use cases
Eligibility checks
Confirm exact age for school admissions, sports age brackets, or age-restricted sign-ups.
Legal & official forms
Work out precise age in years and months for documents that ask for both.
Countdown to a birthday
See exactly how many days remain until the next birthday.
Frequently asked questions
How is age in years, months, and days calculated?
The calculator counts the number of full years, then full months, then remaining days between the date of birth and the "as of" date — the same way you'd count on a calendar.
Can I calculate my age on a future or past date instead of today?
Yes. Change the "Calculate age as of" field to any date to see age at that point, past or future.
Does it account for leap years?
Yes. The calculation is done with real calendar dates, so leap years are handled automatically.
Is my date of birth sent to a server?
No. The calculation runs entirely in your browser — nothing is transmitted, stored, or logged.