RoofAngler
Free roof pitch calculator — angle, slope & rafter length
RoofAngler 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 with roofing guides. All calculations run in your browser — no account needed, no ads, completely free.
Features
Three input modes: Rise & Run, Angle (degrees), or Pitch Ratio (X:12)
Live SVG roof diagram that updates as you type
Outputs pitch ratio, angle, slope %, rafter multiplier, rafter length
Reference chart for 20+ common roof pitches
Blog with 9 roofing guides
No account, no ads, no data collected — 100% free
Use Cases
Homeowners planning a roof replacement or addition
Contractors verifying pitch before ordering materials
Roofers calculating rafter lengths on the job site
DIYers building sheds, pergolas, or carports
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