This age calculator converts a birth date into exact years, months, days, and total days lived as of today or a chosen date.
Everyday life
Age Calculator
Calculate years, months, days and total days between two dates.
Calculator
About this calculator
Formula notes
Years and months count whole calendar boundaries; remaining days complete the period; total days = as-of date − birth date.
Worked examples
- Example: born 2000-01-01, on 2026-07-25 you are 26 years, 6 months, and 24 days old — 9702 days in total.
- Someone born on 2000-02-29 is 24 years old on 2024-02-29, but anniversary handling in non-leap years depends on the legal or administrative convention.
How to use it
- Enter your date of birth.
- Leave the as-of date as today or change it.
- Read years, months, days, and total days.
Frequently asked questions
Does it handle leap years?
Yes. Calendar-based counting includes every Feb 29 inside the span.
Why is total days different from years × 365?
Because leap years add extra days; 26 years here include several leap days.
Limits and interpretation
- Calendar age is not a simple total-days division because months and years have different lengths.
- Legal age rules for leap-day birthdays and inclusive counting vary by jurisdiction and purpose.