Roofing Calculator

Estimate roofing materials needed \u2014 shingles, underlayment, and roofing squares for your project.

Roof Area (sq ft)

Pitch - Rise (e.g. 4 for 4:12)

Pitch - Run (e.g. 12)

Waste Factor (%)

Roofing Squares

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Bundles of Shingles

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Underlayment Rolls

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Actual Roof Area

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How It Works

Roofing material is measured in "squares" where 1 square = 100 sq ft. Shingles come in bundles (3 bundles per square). The pitch factor accounts for the slope of the roof. A waste factor is added for cut-offs and mistakes.

About this Calculator

The Roofing Calculator is a free, easy-to-use tool for shingles, squares, material. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.