Is this Birthday Paradox Calculator free to use?

Yes, Birthday Paradox Calculator is 100% free to use online with no installation or account required.

How do I use the Birthday Paradox Calculator?

Simply enter your values into the required input fields and click calculate to view the results instantly.

Yes, the calculator is fully responsive and compatible with Android, iOS, Windows, macOS, and Linux web browsers.

Birthday Paradox Calculator — Free Online Tool

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Probability that two people share a birthday

Note: Only 23 people needed for >50% chance of a shared birthday.

Group

People in Group

⚠️ For educational purposes only. Verify results with a qualified professional when making important decisions.