Calculate roofing materials needed for your project including shingles, squares, and bundles. Our free roofing calculator considers roof pitch to give accurate measurements.
Footprint Area
1200.00 sq ft
Pitch Factor
1.05
True Roof Area
1264.91 sq ft
Squares Needed
14 sq
Bundles Needed
42
Estimated Total Cost
$4900.00
1 square = 100 sq ft. Standard shingles come 3 bundles per square. 10% waste is recommended. It's better to have extra material than to run out mid-project!
Get your roofing materials and start your project today
Shop at Home Depot →Roofing estimates usually start with the project area or volume, then add a waste factor before converting the result into bags, pieces, bundles, panels, or gallons. Use this calculator when you need a fast material estimate before ordering supplies, comparing costs, or planning a construction project.
Contractors, builders, remodelers, and DIY homeowners who need a practical jobsite estimate.
Start with the dimensions of the project, then choose material settings, price, and waste percentage.
The basic workflow is to calculate roof area, convert to squares, add starter shingles, then round up so you do not run short during installation.
A roofing square is 100 square feet of roof area. It's the standard unit of measurement for roofing materials.
One roofing square equals 100 square feet. Calculate total roof area, divide by 100, add for starter shingles and waste.
Measure each plane: length × width. Sum all planes. Consider pitch for accurate area.
Divide total square footage by 100 to get squares.
Add 1 square of starter shingles for the roof edges.
Measure ridge and hip length for cap shingles - typically 1 bundle covers ~25 linear feet.
Add 10-15% extra for waste, valleys, and mistakes.
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