What is a roofing square?

A square equals 100 square feet of roof area; shingles are sold three bundles per square.

How does pitch change the amount?

Steeper roofs have more surface area than their footprint, so the pitch multiplier increases the material needed.

Enter your roof footprint and pitch to estimate the roof area, number of roofing squares, and shingle bundles needed.

Estimates only. Round up and buy a little extra to account for waste, spills, and breakage.

Roof area = footprint × pitch multiplier. Squares = area ÷ 100. Bundles = squares × 3, plus waste.

What is a roofing square?: A square equals 100 square feet of roof area; shingles are sold three bundles per square.
How does pitch change the amount?: Steeper roofs have more surface area than their footprint, so the pitch multiplier increases the material needed.

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Roof pitch multipliers used to convert footprint to roof area.