Age Difference Calculator
Enter two birth dates and see the exact gap between them — who is older, and by how many years, months and days.
—
| Total days apart | — |
| Person 1 born | — |
| Person 2 born | — |
How to use it
Enter the first date of birth.
Enter the second date of birth — a sibling, partner, parent or friend.
See the exact gap in years, months and days, plus the total days between the two dates.
More than a party question
"How much older is Dad than Mum?" "Are the twins exactly the same age as their cousin?" Age gaps decide real things too — school year placement between siblings, eligibility windows, and the generation maths behind family trees. Year subtraction alone gets the answer wrong whenever a birthday has not happened yet this year; this calculator borrows months and days properly, so the gap it quotes is the gap that is true. Birth dates are calculated on your device and never sent anywhere.