Roofing calculator

Roof squares, shingle bundles and underlayment from your footprint and pitch.

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How this works

Roof area = (length + 2 × overhang) × (width + 2 × overhang) × pitch factor, where pitch factor = √(1 + (rise/12)²). Add waste (10% for gables, 15% for hips). One square = 100 sq ft = about 3 bundles of architectural shingles.

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Roofing guide

Compare roof coverings, installed costs, ventilation needs, and contractor questions for a durable roof suited to your home and climate.