Age Calculator
Calculate exact age in years, months and days from a birthdate.
Enter a birthdate (and optional reference date) to get the exact age in years, months and days, plus total days, hours and minutes lived.
Common use cases
- Compute exact age for legal forms requiring years, months and days
- Plan birthday milestones (10,000 days, 1 billion seconds, etc.)
- Calculate age between two arbitrary dates for historical research
- Verify age-eligibility cutoffs for school, retirement or insurance
Frequently asked questions
Does it handle leap years?▾
Yes — calculations use real calendar arithmetic, so February 29 and leap years are correctly counted.
How is the months count handled?▾
We count completed months between the dates. So Jan 15 → March 14 is 1 month and 27 days, not 2 months.