Age difference calculator

Find the exact age gap between two people. Enter both dates of birth to get years, months, days, and total days between them — leap years included.

First birth date

Second birth date

Results appear here.

Age difference FAQ

How do I calculate age difference?

Enter both birth dates. ChronoCalc treats the earlier date as the start and returns the chronological gap in years, months, and days — the same borrowing method as our how old am I tool.

Does birth order matter in the form?

No. Either person can go in either field; we sort the dates automatically.

Can I check Irish twins spacing?

If you want a clear under-12-months flag with respectful copy, use the Irish twins calculator.

Also try How old am I or Irish twins.