Roofing Calculator

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Roofing Calculator

Estimate roof area, number of roofing squares, and shingle bundles needed for your roofing project.

Roof Length (ft)

Roof Width (ft)

Roof Pitch (rise in inches per 12" run)

1/12 (Flat / Low Slope) 2/12 (Low Slope) 3/12 4/12 (Conventional) 5/12 6/12 (Standard) 7/12 8/12 9/12 (Steep) 10/12 11/12 12/12 (Very Steep)

Roof Area

0 sq ft

Roofing Squares (100 sq ft each)0

Shingle Bundles Needed (3 per square)0

Pitch Factor0

About Roofing Calculator

Roofing is measured in "squares" — one square equals 100 square feet. The pitch factor adjusts the footprint area to account for the slope of the roof. A roof with a 6/12 pitch has a multiplier of 1.118, meaning the actual roof surface is 11.8% larger than the footprint.

Standard 3-tab shingles come in bundles of 3 per square. Architectural/laminated shingles may vary. Always order extra material for ridge caps, starter strips and waste (typically 10-15%).