This age difference calculator shows how much older one person is than another. Enter two dates of birth to see the gap in years, months and days, plus the total number of days between the dates. Free, right in your browser.
How to find the age difference
- Enter the first date of birth in the top field.
- Enter the second date of birth in the second field.
- Press “Run” and see the difference in years, months and days.
How the difference is calculated
The calculator finds how many full years, months and days lie between the two dates. The order doesn't matter — the difference is always shown as a positive value.
It uses the real calendar, allowing for the different lengths of each month and leap years, so the result is exact to the day.
Next to it is the total number of days between the dates — handy when you need the gap in days.
When it comes in handy
To find the age gap between partners, friends, brothers and sisters.
To work out how much older one child is than another, down to the day.
To compare any two dates — for example, how much time lies between two events.
Age difference FAQ
How do I work out the age difference between two people?
Enter two dates of birth in the fields above and press “Run”. The calculator shows the difference in years, months and days.
Does the order of the dates matter?
No. The calculator always shows the difference as a positive value, whichever order you enter the dates in.
Does it account for leap years?
Yes. It uses the real calendar, including February 29 and the different lengths of each month, so the difference is exact.
Can I see the difference in days?
Yes. Besides years, months and days, the calculator shows the total number of days between the two dates.
What if the dates are the same?
If both dates are identical, there is no difference — the calculator points this out.
Is it free?
Yes, the calculator is completely free and works without any sign-up.
Are the dates I enter stored?
No. Every calculation runs directly in your browser on your device — the dates are never sent anywhere.
Does it work on mobile?
Yes, the page works the same on phones, tablets and computers.