Roof pitch & slope

Rise/12 → slope multiplier and roof angle.

Converts a roof pitch (rise per 12 of run) into the slope multiplier used to scale plan area to sloped area, and the corresponding roof angle in degrees.

Inputs

Pitch

Rise per 12 of run.

Result

Enter values above to calculate.

Common pitches — multiplier & angle


3/12	1.0308 ×	14°
4/12	1.0541 ×	18.4°
5/12	1.0833 ×	22.6°
6/12	1.118 ×	26.6°
7/12	1.1577 ×	30.3°
8/12	1.2019 ×	33.7°
9/12	1.25 ×	36.9°
10/12	1.3017 ×	39.8°
11/12	1.3566 ×	42.5°
12/12	1.4142 ×	45°