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First release.
Convert roof pitch, angle and slope percent, then size the roof and rafters
A roof pitch calculator for builders, framers, roofers and DIY planners. Start from whatever you know and get every other slope figure, plus roof area and rafter length. • Enter rise per 12, an angle, a slope percent, or any rise and run • Get the pitch ratio (such as 6:12), angle in degrees, slope percent and pitch factor • Turn a plan area into roof surface area, roofing squares and shingle bundles, with waste • Find rafter length for a run and overhang, in feet and inches or meters • See how much the roof rises over the rafter run • Get common and hip / valley rafter factors with plumb and level cut angles • Check a birdsmouth seat cut against the one-quarter rafter depth rule • Compare the pitch one step lower or higher and browse a 4:12 to 12:12 pitch table • Copy or share a full summary of the results • Save scenarios with names and notes for each job