Shingles for a 30×40 Roof
A 30×40 footprint at a 6/12 pitch is about 13.4 roofing squares — roughly 45 bundles of architectural shingles plus 4 roll of underlayment. Set your real pitch below.
Shingle bundles
45 bundles
Roof area
1,342 sq ft1,200 sq ft footprint × 6/12 pitch
Roofing squares
13.4 squares1 square = 100 sq ft
Shingle bundles
45 bundles3 bundles/square + 10% waste
Underlayment
4 rolls30# felt, 400 sq ft/roll
Shingle cost (est.)
$1,485~$33/bundle architectural
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