About this tool
The Age Calculator works out the exact time between your date of birth and today — or any date you choose — in years, months and days, correctly accounting for different month lengths and leap years. It also shows your age in total months, weeks and days, and counts down the days to your next birthday.
How to use
- 1Enter your date of birth.
- 2Optionally change the 'age at' date.
- 3Read your exact age and next birthday countdown.
Benefits
- Exact years, months and days.
- Handles leap years correctly.
- Next-birthday countdown included.
Calculate completed age from real calendar dates
Practical example
Someone born on December 30 has not completed the next year of age on December 29, even though the year numbers differ. Calendar comparison avoids simply subtracting birth year from current year.
Interpreting the result
Use completed years for ordinary age, and read months or days only when a form or planning task needs finer detail. Confirm whether the relevant date should be today or another reference date.
Limits and common mistakes
Legal age rules can depend on jurisdiction, exact time, official records and special leap-day treatment. This calendar result is informational and does not replace an authority’s decision.
Frequently asked questions
Does it account for leap years?+
Yes. It uses real calendar dates, so February 29 and leap years are handled correctly.
Can I calculate age at a past date?+
Yes. Change the second date to any day to find the age at that moment.