Enter the roof rise and run to find the pitch ratio, angle in degrees, percent grade and the slope multiplier used to convert footprint area to roof area.
Roof pitch describes steepness as rise over run—the inches of vertical rise per 12 inches of horizontal run. A 6/12 pitch rises 6 inches for every 12 inches across. Enter your rise and run above to see the pitch expressed several ways.
The angle is the arctangent of rise divided by run. The percent grade is rise divided by run times 100. The slope multiplier—the diagonal length divided by the run—is what you multiply a roof's flat footprint by to get its true sloped area. A 6/12 roof has a multiplier of about 1.118, meaning the surface is roughly 12% larger than the footprint.