How to use the age calculator
- Enter the date of birth.
- Choose the date on which you want to calculate the age. It must be on or after the birth date.
- Select Calculate to see the calendar age and total days.
Worked example
A person born on 15 June 2000 is 25 years, 4 months and 24 days old on 8 November 2025.
Frequently asked questions
How are leap-day birthdays handled?
For a birthday on 29 February, the calculator uses the last available day of February when the target month has no 29th day.
Can I calculate age on a past date?
Yes. Change the age-on date to any date on or after the date of birth.
Does the result depend on time of birth?
No. This tool compares calendar dates only. It does not include times of day or time-zone differences.
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Updated 8 November 2026 · Built-in tools, no signup