Roof Pitch
Pitch as fraction, degrees, and percent.
Example
You enter
- Rise (in) 6
- Run (in) 12
- Mode rise_run
You get
- Degrees 26.57
- Percent 50 %
- Pitch (in/ft) 6
Checked against published worked examples from: CertainTeed.
Details, formula, and sources
Formula or tablePitch = rise / run, expressed as N/12 (carpenter form), degrees (atan2), and percent. Conversions for fall over distance.
Source and editionClassical geometry; IRC 2024 §R905 slope minimums by roof-cover class (asphalt shingles 2:12 with double underlayment below 4:12, R905.2.2), unchanged from 2021.
Free accessFree read-only access at codes.iccsafe.org.
What governsEstimate. AHJ and licensed structural engineer govern.
API field namesrise, run, mode, degrees, percent, pitch_in_per_ft