Project Inputs
Estimate roofing material from roof footprint or total area, then adjust for pitch and waste.
1) Roof area input
Use dimensions for a quick estimate or total area when you already have plan measurements.
Enter total horizontal roof plan area before pitch adjustment. This value is usually measured from plans or aerial tools.
sq ft
2) Pitch guidance
Roof pitch is rise/run. For example, 6/12 means 6 inches of rise for every 12 inches of horizontal run.
Rise is the vertical change in inches used in the rise/run pitch expression.
in
Run is the horizontal distance in inches used in the rise/run pitch expression. Most U.S. roofing estimates use 12.
in
Common pitch presets
Pitch factor: 1.118
6/12 is a moderate slope. A 10% to 12% waste buffer is common for many cut-up roof layouts.
3) Material assumptions
Waste accounts for starter strips, ridge caps, cuts at valleys, and installation losses.
%
Enter the square-foot coverage per bundle from the shingle packaging.
sq ft
Estimated cost is bundles required multiplied by this bundle price.
$