Age Difference Calculator
Exact gap between two birth dates
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Difference in years—
Difference in months—
Difference in days—
Who is older—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- 1990-05-15 vs 1988-11-20 → 1 year (17 months, 541 days); second person is older
- Person A born 1990-05-10, Person B born 1985-11-20 → B is older by 4 years (1,632 days)
Formula
Difference in days = |date₂ − date₁|. Years uses the mean Gregorian year of 365.2425 days, and months the mean month of 30.436875 days, so both are averages rather than exact calendar counts.
About Age Difference Calculator
Exact gap between two birth dates. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
Is this tool free to use? +
Yes, it is completely free with no registration or download required.
Is my data private? +
Yes. Everything is processed locally in your browser. Nothing is uploaded or stored on our servers.
Does it work on mobile? +
Yes, it works on any device — phone, tablet, or desktop.