Roofing squares & materials calculator
Enter the roof footprint and pitch to get squares, shingle bundles, and your shingle cost.
Roof surface
2,236 sq ft
Squares (with waste)
24.6
Shingle bundles
74
Shingle cost
Add price
Pitch factor for 6/12: 1.118. This covers field shingles only - add starter, ridge cap, underlayment, drip edge, and labor separately.
How to calculate roofing squares
A roofing square is 100 square feet of roof surface. Because a pitched roof is longer than its footprint, multiply the footprint (including overhangs) by the pitch factor, then divide by 100.
Pitch factor = √(1 + (rise ÷ 12)²). A 6/12 roof has a factor of about 1.118, so a 2,000 sq ft footprint is about 2,236 sq ft of roof - 22.4 squares before waste.
How much waste to add
Simple gable roofs often use around 10%. Hip roofs, valleys, dormers, and cut-up roofs need more. Use your own experience for the roof in front of you.
Bundles per square
Most three-tab and architectural shingles are packaged at three bundles per square, but check the wrapper - some heavier products use four or more.
Turn these numbers into a signed roofing proposal
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