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Roofing Calculator

Roofing Calculator

Calculate roofing materials needed — shingles, underlayment, and ridge cap for any roof size.

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Fill in your values above and click Calculate.

Frequently Asked Questions

One roofing square = 100 square feet of roof area. Most shingle bundles cover 33 sq ft, so 3 bundles = 1 square.
Add 10-15% for a simple gable roof, 15-20% for complex roofs with multiple valleys and hips. Better to have extra than run short.