Roof Pitch Calculator
Calculate roof pitch (as x/12), pitch angle in degrees, and percent grade from the roof's rise and run.
Roof Pitch Mathematics
Roof pitch calculator computes roof pitch (as x/12), pitch angle in degrees, and percent grade from the roof's rise and run.
Roof pitch is conventionally expressed as inches of vertical rise per 12 inches of horizontal run (e.g. "6/12 pitch"). The same rise-over-run ratio also converts directly to a pitch angle via the arctangent function.
- 1Enter the roof's rise and run (in the same units, e.g. inches).
- 2View the pitch expressed as x/12, the pitch angle in degrees, and the percent grade.
A roof rises 6 inches for every 12 inches of horizontal run.
Frequently Asked Questions (FAQ)
Pitches below 4/12 are considered low-slope, 4/12 to 9/12 are standard residential pitches, and anything above 9/12 (about 37°) is generally considered steep, often requiring special safety equipment to walk on.
This calculator finds the pitch itself from a measured rise and run; the separate roofing area calculator goes the other direction — it takes a known pitch (like 6/12) as an input to compute total roof surface area and shingle needs.
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