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BuildRight
Convert a measured rise and run into the standard rise:12 pitch notation roofers use.
Roofing pitch is conventionally expressed as inches of rise per 12 inches of horizontal run (like '6:12'), regardless of the actual run measured — this calculator normalizes any rise/run measurement to that standard notation.
Low-slope roofs (under about 2:12) generally need membrane roofing rather than standard shingles, since shingles rely on steep enough pitch to shed water quickly — very steep roofs (over 9:12) need special safety consideration during installation.
Angle
26.565 °
Roof pitch is conventionally written as rise:12, e.g. a '6:12' roof rises 6 inches for every 12 inches of horizontal run.
What you entered
Pitch as rise per 12 inches of run
(6 ÷ 12) × 12= 6:12Angle from horizontal
atan(6 ÷ 12)= 26.5651°Result
Angle: 26.565 °
A rise of 6" over a run of 12" is a 6:12 pitch, about 26.56505117707799° from horizontal.