Age Difference Calculator

The exact age gap between two birth dates.

Quick answer: Calculate the exact age difference between two dates. Free age gap calculator showing exact years, months, and days separating birthdates.

Age difference3 yr 6 mo
In days1,285
In weeks183

computed locally — nothing leaves your browser

Calculate the precise age difference between two people in years and months, plus the gap in days and weeks.

How it works

  1. Enter the birth date for the first person.
  2. Enter the birth date for the second person.
  3. Review the age gap output in total years, months, and days.

Frequently asked questions

Does the order of dates matter?

No — the tool uses the absolute difference, so it works regardless of which date is earlier.

How precise is the years-and-months figure?

It is a close approximation using average month and year lengths; the days figure is exact.

Can I compare any two dates?

Yes — though labeled for birth dates, it works for any pair of dates.

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