Roof Pitch Calculator logo

Roof Pitch Calculator

Free roof pitch calculator. Enter rise and run to instantly calculate pitch ratio, angle, slope percentage, and rafter length.

About Roof Pitch Calculator

Roof Pitch Calculator is a free tool for homeowners, contractors, and roofers. Enter rise and 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, a reference chart of 20+ common roof pitches, and a blog covering roofing guides. All calculations run in your browser — no account needed, no ads, no data collected, completely free.

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