Roofing · Trade geometry
Measure rise and run. Read the roof pitch.
Convert a level pitch triangle into in-12 pitch, angle, grade, slope factor, sloped rafter line, and approximate roof-plane area.
← Pitch run →↕ Pitch rise↗ Sloped rafter length
← Building length →↕ Building span← Eave overhang →
1 Enter the measured pitch triangle
2 Add the roof footprint
Results update automatically · pitch geometry is not a structural sizing calculation
Transparent geometry
Right-triangle pitch with visible conversions.
Angle is arctangent of rise divided by level run. The slope factor is the hypotenuse divided by run and is applied to the horizontal eave run.
For a purchasing estimate after verifying the geometry, use the roofing material calculator.