Answer “how old” in human-readable units—useful for forms, games, or milestones. Not for medical gestational math; times of day are ignored.
Birth date
As of
Leave empty to use today.
Age
Choose a birth date.
Related tools
How it works
Dates are compared at noon local time to reduce single-day edge cases near zones.
Years and months count whole calendar units; remaining days fill out the span.
Use cases
Human-readable age from birthdays; not for legal medical gestational calculations.
Leap years
February 29 birthdays compared to non-leap years follow common calendar-age conventions.
Common questions
- Time of birth?
- Only calendar dates are used; times are ignored.
- Future birth date?
- Results require “as of” on or after birth.
- Weeks?
- Not shown; use the difference tool for raw spans.
- Privacy?
- Nothing leaves this page.