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Age Calculator

Calculate exact age in years, months, and days from a date of birth.

What does this tool do?

Your age is not just a single number — it is years, months, and days. This calculator computes your exact age from any date of birth to today, correctly handling leap years, the varying length of months, and all the edge cases that make date arithmetic trickier than it looks. It also shows the total number of days and weeks you have been alive — a surprisingly large number that tends to prompt some reflection.

How to use it

  1. Enter your date of birth using the date picker.
  2. Your exact age appears instantly, broken down into years, months, and days.
  3. The total days and weeks lived are shown below.

Pro tips

  • For legal and insurance purposes, age is almost always calculated to the exact day — not just the year.
  • Leap year birthdays (February 29) are handled correctly using standard calendar rules.
Example

Date of birth: January 1, 1990 | Today: July 5, 2026

36 years, 6 months, 4 days
Total days alive: 13,334
Total weeks alive: 1,904

When would you use this?

  • Filling out a form that asks for your exact age in years and months
  • Verifying age eligibility for something that requires exactly 18 years and 0 months
  • Finding a person's exact age from their date of birth for an HR or medical record
  • Satisfying curiosity about how many days you have been on the planet