To calculate age from date of birth, enter the date of birth; the age is calculated as of today (or any date you choose in “Age on”). Useful for forms that ask for age on a specific date, such as exam eligibility cut-offs.
How to use the Age Calculator
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1
Enter date of birth
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2
Optional: change “Age on”
e.g. an exam cut-off date.
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3
Copy the result
How it works
Years and months are counted by calendar, and remaining days use the real length of the previous month, so results match how age is counted on official forms. Leap years are handled automatically.
Features
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Age on any date
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Totals in months, weeks, days
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Next birthday countdown
Privacy and file handling
- Where it runs
- Runs in your browser
Runs entirely in your browser. Your files and text are not uploaded to our servers.
Frequently asked questions
How is age calculated for someone born on 29 February?
The calculator counts by calendar; in non-leap years the birthday is treated as falling after 28 February.
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