RoofPitchCalc: Slope Angle

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