Age Difference Calculator
Calculate the exact age gap between two people in years, months, and days.
How to Calculate an Age Difference
- Enter both birth dates.
- The exact age difference appears instantly, in years, months, and days.
Frequently Asked Questions
How is the years/months/days breakdown calculated?
It calculates full calendar years, then full calendar months within the remaining time, then whatever days are left over — the same method a person would use counting on a calendar, rather than just dividing the total number of days by 365.
Does the order I enter the two dates in matter?
No — this tool automatically figures out which date is earlier, so you can enter them in either order and get the same result.
How are birthdays on February 29 handled?
In a non-leap year, February 29 doesn't exist, so an anniversary calculation for a leap-day birthday rolls forward to March 1 in that comparison — a widely used, reasonable convention for this genuinely ambiguous edge case.
Are the dates I enter sent anywhere?
No — the calculation happens entirely in your browser using JavaScript, so nothing you enter is ever sent to a server.