Roof Pitch Calculator
Calculate roof pitch ratio and slope angle from rise and run.
Calculate roof pitch ratio and slope angle from rise and run.
The roof rises 6 inches for every 12 inches of horizontal run — about 26.6°.
Pitches up to 6/12 are generally walkable with proper footwear. Above 9/12 is steep and typically requires staging.
Results are estimates for planning purposes. Verify with product labels and local requirements before purchasing materials.