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Age Calculator Guide
Find an exact age in years, months, and days from a date of birth — as of today or any date you choose. It also shows the total months, weeks, and days lived.
It counts complete years, then the remaining complete months, then the leftover days, adjusting for different month lengths and leap years automatically.
How Do I Calculate Age?
Subtract the birth year, month, and day from the target date. If the day comes out negative, borrow days from the previous month; if the month is negative, borrow twelve months from the years. The calculator handles all of this for you.
What You Get
- Exact age in years, months, and days.
- Total months, weeks, and days lived, for quick reference.
- Any reference date — check age on a past or future date, not just today.
Counting the gap between two dates instead? Use the Date Difference Calculator, or count down to an event with Days Until.
Frequently Asked Questions
How do I calculate my exact age?
Subtract your birth date from today's date, counting complete years, then months, then days, adjusting for month lengths.
Can I find my age on a future date?
Yes — set the reference date to any past or future day to see the age at that point.
Does the age calculator account for leap years?
Yes — it uses actual calendar dates, so leap years and varying month lengths are handled correctly.
How many days old am I?
The calculator shows your total days lived alongside your age in years, months, and days.
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