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Calculate a roof's pitch angle and slope percentage from its rise and run.

How It Works

How Roof Pitch Calculator Works

Roof pitch is conventionally expressed as rise over a run of 12 inches (like "6/12") — the calculator converts that ratio into the actual angle in degrees using the arctangent function, and also expresses it as a slope percentage.

FAQ

Frequently Asked Questions

What does a "6/12" pitch mean?
It means the roof rises 6 inches vertically for every 12 inches of horizontal run — a common moderate residential pitch that translates to roughly a 26.6° angle.