Age Calculator
Calculate your exact age in years, months, and days from your birth date. Find out how many days you have been alive.
Years
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Months —
Days —
Total Days Lived —
How to Use This Calculator
- Enter your birth year, birth month, and birth day.
- The "As of" fields default to today's date — leave them or change them to a custom target date.
- Click Calculate to see your age in years, months, days, and total days lived.
Formula
Age = Target Date − Birth Date
The difference is first expressed in complete years, then the remaining months, then the remaining days.
Example
Example: Birth date May 15, 1990 → as of March 18, 2026 = 35 years, 10 months, 3 days (13,087 total days).
Frequently Asked Questions
- Enter your birth year, month, and day. The calculator computes the difference between your birth date and today, breaking it down into years, months, and days.
- Yes — change the "As of" year, month, and day fields to any target date instead of today.
- The result is exact to the day, accounting for leap years and differing month lengths.
- The calculator will show negative values — it handles future dates and shows how many days until that date.
- The calculator works with calendar dates only; times and time zones are not considered.