Free Roofing Calculator - Material Estimation Made Easy

1 square = 100 square feet of roof area

A roofing square is 100 square feet. A 2,000 sq ft roof is 20 squares. Materials are typically sold by the square for easy estimation.

3 bundles per square (standard), 4-5 for architectural

Typically 3 bundles per square for standard shingles. Some architectural shingles require 4-5 bundles per square. Always check manufacturer specifications.

Footprint × pitch factor (6/12 pitch = multiply by 1.118)

Multiply footprint by pitch factor. Common factors: 4/12 pitch = 1.054, 6/12 = 1.118, 8/12 = 1.202, 12/12 = 1.414. A 1500 sq ft footprint at 6/12 pitch = 1677 sq ft roof.