Age Difference Calculator
Find the age gap between two people from their birth dates, in years, months and days, plus totals in weeks and months, and who is older. Runs in your browser.
Age difference
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How it's counted
The gap is the calendar difference between the two birth dates, full years, then the leftover months and days, using each month’s real length. Whoever was born earlier is the older of the two.
total days = (later birth − earlier birth) ÷ one day
The order you enter the dates doesn’t matter; the difference is always shown as a positive gap. All dates are handled in UTC so daylight-saving never adds or drops a day, and nothing leaves your browser.
What this does
An age difference calculator finds the gap between two people from their birth dates, in years, months and days, plus totals in weeks and months, and who is older.
How to use it
- Enter the first birth date.
- Enter the second birth date.
- Read the gap in years, months and days.
- See which person is older.
How it works
It is the calendar difference between the two birth dates (full years, then leftover months and days) using each month’s real length, always shown as a positive gap.
age gap = | birth date 1 − birth date 2 |
Understanding your result
The gap is the plain calendar distance between two birth dates, always shown as a positive figure whatever order you enter them. It is a neutral fact rather than a judgement: what a given gap means depends entirely on context and the people involved, so treat the number as trivia or genealogy data rather than anything more.
Example
People born on 1 January 1990 and 1 July 1992 have a gap of 2 years, 6 months.
Sources & methodology
Last updated .
Frequently asked questions
How is the age gap counted?
It is the calendar difference between the two birth dates (full years, then leftover months and days) using each month’s real length.
Does the order of the dates matter?
No. The gap is always shown as a positive difference, and the result tells you which of the two people is older.
Is anything stored?
No. The dates are processed entirely in your browser.
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