How is exact age calculated?

The calculator finds the full number of years, then months, then days between the two dates, carrying over from one unit to the next the same way you would counting on a calendar by hand.

Does the calculator account for leap years?

Yes. Because the calculation walks month by month and day by day rather than assuming a fixed 365-day year, leap years and varying month lengths are handled automatically.

Calculators Health

Age Calculator

Calculate exact age in years, months, and days between two dates.

Date of birth

Calculate age as of

Years

Months

Days

Total days lived

9,702

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About this tool

Enter a date of birth and, optionally, a different reference date, and this tool works out the exact age as of that day — broken down into full years, months, and days, plus the total number of days lived. It correctly accounts for varying month lengths and leap years.

How to use this tool

1
Enter the date of birth
Use the date picker or type the date directly into the first field.
2
Choose a reference date (optional)
By default this is set to today — change it to calculate age as of any other date.
3
Read the breakdown
Your exact age appears broken into years, months, and days, plus a running total of days lived.

Frequently asked questions

How is exact age calculated?: The calculator finds the full number of years, then months, then days between the two dates, carrying over from one unit to the next the same way you would counting on a calendar by hand.
Does the calculator account for leap years?: Yes. Because the calculation walks month by month and day by day rather than assuming a fixed 365-day year, leap years and varying month lengths are handled automatically.