Age Calculator
Calculate exact age in years, months and days from a birth date.
Tip: For legal or administrative use, calculate age against the exact reference date required by the form.
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About this digital tool
An age calculator finds the exact time between a birth date and a reference date. It reports age in years, months and days, which is more precise than subtracting birth year from current year. This matters for forms, school eligibility, benefits, anniversaries and personal planning. The calculation accounts for month lengths and leap years, so someone born on February 29 or near the end of a month gets a more accurate result than with a simple year difference.
How to use
- Enter the birth date.
- Choose today's date or another reference date.
- Read the exact age in years, months and days.
Frequently asked questions
Why not just subtract years?
Subtracting years ignores whether the birthday has happened yet and misses month/day precision.
Does leap year matter?
Yes. Exact date calculations should account for February 29 and different month lengths.
How is exact age calculated in years, months and days?
Full years are counted from the birth date to the reference date, then full months, then the remaining days. The count follows the real calendar and takes leap years into account.
How many days have I lived?
The tool shows the total number of days from birth to the reference date. Change the reference date to see the figure for another day.