RoofAngler
Free roof pitch calculator — angle, slope & rafter length
What it does
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.
Does the same job
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Roofing CalculatorApr 2026 · roofing-calculator.ioCalculate roof pitch, slope, area, and material estimates.
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