House plan with loft
Last updated 1 year ago
Roof Pitch Calculator - Calculates Pitch, Rafter Length, Angle and Slope
Roof Pitch Calculator The roof pitch calculator calculates slope, pitch, angle and rafter lengths, based on input of rise (M) and run (R). Use the diagrams on this page as a reference when inputting rise and run, and while interpreting the calculated results. Common Rafter Detail To determine the finished height of the ridge beam, add the Rise (M) and the Y height. To determine the Y height, measure from the bird's mouth up the calculated slope (X in 12) to the top of the rafter. Th...