Roof Angle to Pitch Calculator

RunRiseangleroof surface

How to measure

Lay a phone angle app or a digital angle finder on the roof surface or along a rafter and read the angle.

Angle

Roof pitch

5.85/12

Closest standard pitch: 6/12, a 48.8% slope

How the estimate was calculated
Angle26 °
Rise per 12 in of run5.85 in
Closest whole pitch6/12
Slope48.8 %
Pitch factor1.113 ×

Roofing materials and codes refer to pitch as rise per 12 in of run. Multiply a roof footprint by the pitch factor for its sloped area.

See the formula, sources and worked examples on Matholio