Age Difference Calculator
Work out the exact age gap between two people from their birth dates.
The gap between two ages
Working out the age difference between two people is more than subtracting birth years — the months and days matter for an exact figure. This calculates the precise gap between two birth dates in years, months and days, so you get the true difference rather than a rough year count.
Enter both birth dates to see the exact age gap.
Why the year alone misleads
Two people born in years two apart might have an age gap anywhere from just over one year to nearly three, depending on where in the year each birthday falls — so the difference in birth years alone can be misleading by almost a year in either direction. Counting the exact days between the two dates gives the real gap, accounting for the months and any leap years in between.
Common questions
Isn't the age gap just the difference in birth years?
Not exactly — depending on where each birthday falls, two people born years apart can differ by nearly a year more or less than the year gap suggests.
What does it account for?
The exact months and days between the two birth dates, including leap years, for a precise gap rather than a rough year count.
Is anything uploaded?
No. The calculation happens in your browser.