Roof pitch and sloped area calculator

Enter the level run and the rise you measured against it, in inches. Plan dimensions are horizontal, as read from a plan view or imagery. Pitch is rise per 12 in of run. Plan-to-slope conversion uses the factor 1 / cos(angle), as the fire setbacks page does.

Level run (in)

Rise over that run (in)

Plan run, eave to ridge (ft)

Plane width along the eave (ft)

Plan-view setback to convert (in)

Pitch (rise per 12 in)-

Slope (percent)-

Roof angle (degrees)-

Slope factor (1 / cos)-

Rafter length up the slope (ft)-

Plan area (sq ft)-

Sloped roof area (sq ft)-

Area missed if plan area is used-

Setback along the slope (in)-

At or under 2:12?-