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Roofing Calculator - Shingles & Squares

Free roofing calculator. Calculate roofing squares and shingle bundles needed. Accounts for roof pitch and waste.

Calculate roofing materials needed

Enter your values to see results

and click the "Calculate" button

Roofing Calculator

Calculate how many roofing squares and shingle bundles you need. Accounts for roof pitch which increases actual surface area.

Roof Area = Footprint × Pitch Multiplier × (1 + Waste%)

Pitch multiplier converts flat area to sloped area. A 6/12 pitch has multiplier 1.118. One square = 100 sq ft, 3 bundles per square.

What is a roofing square?

One roofing square = 100 square feet. Shingles are sold by the bundle, with 3 bundles typically covering 1 square.

How does pitch affect materials?

Steeper roofs have more surface area. A 12/12 pitch needs 41% more material than a flat roof of the same footprint.

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