4/12 Pitch Roof Calculator [ Rafter Length, Slope, Angle ]
To calculate the actual roof length, divide the horizontal span (S) by the cosine of the pitch angle (θ). The 4/12 Pitch Roof Calculator helps homeowners and builders easily determine the slope, rise, and overall dimensions of a roof with a 4:12 pitch. This means for every 12 horizontal inches, the roof rises 4 inches…