The three ways roofers say pitch
The same roof is described three ways: <strong>pitch per 12</strong> (6/12), <strong>angle in degrees</strong> (26.6°), and <strong>percent grade</strong> (50%). Enter any rise and run and the calculator converts between all of them, plus the area multiplier that turns a flat footprint into actual roof surface for ordering.
Why the multiplier matters for ordering
The multiplier is how much bigger the sloped roof is than the footprint. A 6/12 roof multiplies by 1.118, a 12/12 by 1.414 — forget it and you order three squares short on a simple gable. Every material calculator on this site that takes a pitch asks for the multiplier this page produces.