Age Calculator
Find out exactly how old you are — in years, months and days — plus your age in total weeks and days, and how long until your next birthday. Leap years are handled correctly.
How to use this tool
- Enter your date of birth.
- Optionally pick a different “calculate age on” date — today is the default.
- Press “Calculate age” to see your full breakdown.
Key features
- Exact age in years, months and days — not just years.
- Totals in months, weeks and days for fun facts and forms.
- Next-birthday countdown included.
- Handles leap-year birthdays (29 February) correctly.
Frequently asked questions
We count whole calendar years, then whole calendar months, then the remaining days — the same way a person would say their age. Different month lengths and leap years are taken into account.
In non-leap years your birthday is treated as 28 February for the countdown, which is the most common convention.
Yes — set the “calculate age on” date to any day from your birth onwards, for example to check how old you will be at a future event.
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