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Age Gap Calculator

Enter two birthdays — see the age gap in years, months, and days. Works for couples, siblings, or any two people.

Updated June 2026

Enter both birthdays to see the age gap.

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What it does

Enter two birthdays and see the gap in years, months, and days — calendar-correct, not a rough “subtract the years” approximation. Borrows days from the previous month when the subtraction goes negative, so a Feb 28 to Mar 1 gap reads as 1 day, not a month. Works for couples, siblings, sports eligibility, or any two humans.

For a single person’s age today, use Age Calculator. For the math behind the calendar borrowing rules, see How to calculate an age gap.

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Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.

<iframe src="https://freetoolarena.com/embed/age-gap-calculator" width="100%" height="720" frameborder="0" loading="lazy" title="Age Gap Calculator" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>
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How to use it

  1. Pick Person 1&rsquo;s birthday.
  2. Pick Person 2&rsquo;s birthday.
  3. Read the gap in years, months, days — plus total days.
  4. Order doesn&rsquo;t matter; the tool uses the absolute gap.

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