- Enter your date of birth and the date to calculate your age on (defaults to today).
- The calculator counts full years, then months, then days — the same method official forms use.
- Leap years are handled automatically because the maths uses real calendar dates.
- You also get total days lived and a countdown to your next birthday.
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Age Calculator — Years, Months and Days
Work out your exact age — in years, months and days — as of any date you choose. The calculator also shows the total number of days you've lived and how many days remain until your next birthday.
How the age calculator works
Frequently asked questions
How is exact age calculated?
Age is counted in full calendar units: subtract birth date from the target date year by year, borrowing days and months as needed. This is the method used on official documents worldwide.
Does the calculator handle leap years?
Yes. Because it works with real dates rather than averages, 29 February birthdays and leap years are handled correctly.
Can I calculate age at a past or future date?
Yes — change the 'Calculate age on' field to any date. Useful for forms asking 'age as of' a specific date, or historical research.
How do I know when my next birthday is?
The calculator shows the number of days remaining until your next birthday automatically.
Estimates are for guidance only and are based on published 2025/2026 rates. Always confirm with a qualified professional for financial decisions.