Roof Slope Calculator — Calculate Roof Angle, Pitch & Rise

Convert roof pitch (rise/12) to angle degrees, percentage slope, and calculate roof rise over any run length.

Rise (inches)

Run (inches)

Roof Pitch

Angle (degrees)

Slope Percentage

Safety harnesses are required by OSHA for roof work on pitches greater than 4/12. Never walk on a wet or dusty roof of any pitch.

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Frequently Asked Questions

Q: How do you find roof pitch from angle?

Pitch is rise over run. A 4/12 pitch has a rise of 4 inches for every 12 inches of run, corresponding to an angle of 18.4 degrees.

Q: What is a steep slope roof?

A roof with a pitch of 4/12 (18.4 degrees) or greater is considered steep slope. Roofs below 2/12 pitch are low-slope or flat.