Calculate rise, run, angle, and rafter length
Roof pitch describes the steepness or slope of a roof. It's critical for water drainage, snow load, material selection, and building codes.
Pitch notation: Expressed as rise over run (e.g., 6/12 means 6 inches of rise for every 12 inches of run). A 6/12 pitch is common for residential roofs.
Common pitches:
• 4/12 (18.4°) - Minimum for asphalt shingles
• 6/12 (26.6°) - Standard residential
• 8/12 (33.7°) - Steep residential
• 12/12 (45°) - Very steep
How to use: Choose your calculation method. Enter pitch ratio, angle, or actual rise/run measurements. The calculator provides all related measurements including rafter length.