Exact Age Calculator
Calculate your exact age in years, months, days, weeks and total days on today or any selected date.
Calculate age on any date
Use an exact date of birth and a reference date.
When an exact-age calculation is useful
Exact age is useful for applications, school records, insurance forms, sports eligibility, medical timelines, historical research and birthday planning. Whole-age answers can be insufficient when a cutoff depends on the exact day.
Calendar age versus total days
The headline result uses calendar years, months and days. Total days is also provided because it is useful for comparisons, but it should not be converted back into months using a fixed 30-day assumption.
Privacy
Input values are processed by JavaScript in your browser. The calculator code does not submit them to a server or place them in the URL.
Frequently asked questions
What is exact age?
Exact age is the completed calendar years, months and days from a date of birth to a selected reference date.
Can I calculate age on a past date?
Yes. Select any reference date on or after the date of birth.
How are leap-day birthdays handled?
For calendar differences, February 29 remains the birth date. For a non-leap-year birthday countdown, this tool uses the last valid day of February.