Roof Pitch Calculator is a free online tool for homeowners, contractors, and roofers. It supports three input modes: rise & run, angle in degrees, or pitch ratio (X:12), and instantly calculates:
- Pitch ratio (X:12 notation)
- Angle in degrees
- Slope percentage
- Rafter multiplier
- Rafter length (when roof span is provided)
The tool includes a live SVG roof diagram that updates as you type, a reference chart of 20+ common roof pitches organized by category (flat, low, conventional, steep), and a blog with 9 roofing guides covering topics like how to measure roof pitch, shingles, shed roofs, and more.
All calculations run entirely in your browser — no account needed, no ads, no data collected, completely free. Mobile-friendly, fast, and clean.
