Age Calculator
Calculate age from a birth date to today or to a custom reference date. The result shows years, approximate months, and total elapsed days.
How it is calculated
The calculator counts elapsed days between the two dates. Years and months are shown as readable approximations using average calendar lengths.
Total days = as-of date - birth date Approximate years = total days / 365.2425 Approximate months = total days / 30.436875
Common uses
- Finding age for forms, records, and applications.
- Checking age as of a past or future date.
- Counting elapsed days for milestones, birthdays, and anniversaries.
FAQ
Why are months approximate?
Calendar months have different lengths, so this page uses an average month length for a simple readable estimate.
Can I calculate age on a future date?
Yes. Enter a future as-of date to estimate age at that point.
Does time of day matter?
This calculator uses dates, not birth time, so it is intended for everyday age estimates rather than legal edge cases.