Age Calculator
Calculate exact age in years, months and days from any birthdate. Also reports total weeks and days lived.
Age Calculator
Compute exact age in years, months, days — plus weeks and days totals.
About the Age Calculator
Enter a birthdate (and optionally an "as of" date) and get age broken down into years, months and days, plus total weeks and total days lived. Handles all leap years and month-length variations correctly.
Use it to know your exact age in days, calculate someone's age on a specific date, or fill in "age" fields that need precise values.
How it works
The calculator subtracts birthdate from target date in calendar units — years, months, days — borrowing a month when the target day-of-month is before the birth day-of-month, and borrowing a year when the month is before the birth month. Total days, weeks and months are computed independently from the millisecond difference, so they stay exact.
Examples
- Born May 15, 1990 — As of Nov 4, 202636 years, 5 months, 20 days · 13,322 total days
- Born Feb 29, 2000 — As of Feb 28, 202625 years, 11 months, 30 days
- Born Jan 1, 2025 — As of Jul 1, 20250 years, 6 months, 0 days · 181 total days