Education

Roof Pitch Calculator

Free roof pitch, slope, angle & rafter calculator

Free tool for homeowners, contractors, and roofers. Enter rise & run, a degree angle, or a pitch ratio (X:12) to instantly calculate pitch ratio, angle in degrees, slope percentage, rafter multiplier, and rafter length. Includes a live SVG roof diagram and reference chart of 20+ common pitches. All calculations run in your browser — no account needed, no ads, completely free.