Age Calculator
Calculate your exact age in years, months, and days, plus total completed months and calendar days.
Enter your date of birth and the date you want to calculate your age on.
How is age calculated?
Your age is calculated by comparing your date of birth with the selected target date.
The calculator first counts the number of completed years, then the remaining completed months, and finally the remaining days.
Age calculation example
Suppose someone was born on 15 January 2000 and their age is calculated on 20 March 2025.
From 15 January 2000 to 15 January 2025 = 25 years.
From 15 January to 15 March = 2 additional months.
From 15 March to 20 March = 5 additional days.
Exact age: 25 years, 2 months, and 5 days
Additional age totals
Total months
This is the number of complete calendar months between the date of birth and the selected date.
Total days
This is the number of calendar days between the two selected dates.
Why exact age can be different
Months do not all contain the same number of days, and leap years add an extra day to February. Because of this, calculating exact age is more accurate when calendar dates are compared directly instead of simply dividing the number of days by 365.
FAQ
Frequently asked questions
How is exact age calculated?
Exact age is calculated by comparing your date of birth with the selected target date and accounting for completed years, months, and days.
Can I calculate age on a past or future date?
Yes. You can choose a target date other than today to calculate your age on a specific past or future date.
What does total age in days mean?
Total age in days is the number of calendar days between the date of birth and the selected target date.
How are leap years handled?
The calculator uses calendar dates when calculating age, so leap years are automatically taken into account.