Calculate roof pitch, slope percentage, and roof angle
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Roof pitch describes the steepness of a roof and is expressed as the ratio of rise to run. The rise is the vertical height of the roof, while the run is the horizontal distance. Contractors typically measure pitch over a 12-inch run.
If a roof rises 6 inches for every 12 inches of horizontal distance, the roof pitch is:
Roof pitch is the ratio of the roof's vertical rise compared to its horizontal run.
Using a 12-inch run makes the pitch easy to measure with a level and tape measure and is the standard used in construction.
Roofs with pitches above 8:12 are generally considered steep and may require additional safety equipment during installation.