Is this Rafter Length Calculator free to use?

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

How do I use the Rafter Length 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.

Rafter Length Calculator — Free Online Tool

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Calculate rafter length from span and pitch

Note: Rafter length = √((span/2)² + rise²).

Roof

Building Span (ft)

Pitch (rise per 12 run)

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