Shingles for a 20×30 Roof
A 20×30 footprint at a 6/12 pitch is about 6.7 roofing squares — roughly 23 bundles of architectural shingles plus 2 roll of underlayment. Set your real pitch below.
Shingle bundles
23 bundles
Roof area
671 sq ft600 sq ft footprint × 6/12 pitch
Roofing squares
6.7 squares1 square = 100 sq ft
Shingle bundles
23 bundles3 bundles/square + 10% waste
Underlayment
2 rolls30# felt, 400 sq ft/roll
Shingle cost (est.)
$759~$33/bundle architectural
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