calculator
Age Calculator
Use the age calculator for precise calendar age without timezone-based timestamp surprises.
Result
Add values and run the tool to see a clear result here.
How it works
The calculator counts completed birthdays first, then completed months and remaining days.
Examples
Same-day birthday
Input: 2000-08-15 to 2026-08-15
Output: 26 years, 0 months, 0 days
Before birthday
Input: 2000-12-01 to 2026-08-15
Output: 25 years, 8 months, 14 days
FAQ
Does this use timestamps?
No. Dates are interpreted as calendar dates.
What happens for future birth dates?
The tool returns a validation error.
How are leap-day birthdays handled?
February 29 birthdays use March 1 in non-leap years for MVP.