How to use this calculator
- Enter the date of birth.
- Choose the date to calculate age on.
- Read the calendar age and total elapsed days.
Example
Calendar age accounts for the varying number of days in each month, not just a fixed 365-day year.
How it works
Calculate exact age in years, months and days, total days lived, and days until the next birthday. Inputs are calculated directly in your browser and the result updates whenever a value changes.
Frequently asked questions
Why can months have different lengths?
Age is counted using actual calendar boundaries, so February and 31-day months are handled correctly.
Can I calculate age on a past date?
Yes. Change the “Age on” field to any date after the birthday.