Roof Pitch Calculator
Enter any matching rise and run dimensions to calculate roof pitch, angle and slope percentage.
Results
Pitch
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Angle
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Slope
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Use these values to describe or lay out roof slope. This geometry calculation does not assess structural capacity or building-code compliance.
How it works
Pitch is the rise divided by the horizontal run. The same ratio is converted to rise per 12, degrees and percent slope.
pitch ratio = rise ÷ run; angle = atan(rise ÷ run)Worked example
A 6 in rise over a 12 in run is a 6:12 pitch, about 26.57°, with a 50% slope.
Assumptions
- Rise and run are measured perpendicular to one another.
Limitations
- This is a geometry tool and does not determine structural or code compliance.