Age Gap Calculator
Calculate the exact age difference between two people in years, months and days.
Assumptions used in this calculation
- Calendar: Uses the Gregorian calendar for date arithmetic.
About this calculator
Figuring out the exact age gap between two people — siblings, a couple, coworkers — by counting months and days on a calendar is fiddly, especially across birthdays that haven't happened yet this year or when the two dates fall on different days of a month. This calculator takes two dates of birth and computes the precise difference between them broken into complete years, months and days, the same way age differences are stated in everyday language, along with the total number of days apart and which person is older. It handles the order of input automatically, so it doesn't matter which date you enter first — the calculator determines who's older and formats the gap correctly regardless. Instead of manually subtracting years and then adjusting for whether the second birthday has occurred yet this year, or trying to count on your fingers across differing month lengths, this gives an instant, exact breakdown of the age gap using standard Gregorian calendar arithmetic.
Worked example
Born 15 Aug 1990 and 3 Mar 1994
Result: 3 years, 6 months, 16 days apart
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