Age Difference Calculator
Pick two birth dates and see the gap in years, months and days.
- Years apart
In years, months and days
- Years
- Months
- Days
- Days apart
- Weeks apart
Ages today
- First person's age
- Second person's age
How it works
The gap is found by walking the calendar from the earlier birth date to the later one, so month lengths and leap years are handled on their own. The big number is the whole-year difference; months and days are listed separately. Everything is worked out in your browser; the dates are never sent to the server.
Frequently asked questions
How is an age difference calculated?
Count years, months and days from the earlier birth date to the later one. Between 12 March 1990 and 5 August 1993 there are 3 years, 4 months and 24 days.
Is the difference rounded?
No. Whole years, remaining months and days are shown separately; a "3 year gap" in everyday speech is the whole-year count.
Is the gap shown in days too?
Yes, total days and weeks are calculated as well.
Are the birth dates stored?
No. The calculation runs in your browser and no date is sent to the server.