Roof Shingle Calculator

Estimate the number of shingle bundles and squares needed for your roofing project.

Roof Dimensions

Roof Area (sq ft) (sq ft)

Waste Factor (%)

Shingle Estimate

Enter roof area to calculate shingle needs

Overview

In roofing, a 'Square' is a unit of area equal to 100 square feet. Most standard asphalt shingles are sold in bundles, with three bundles required to cover one square.

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Pro Tips

Always round up to the nearest whole bundle when purchasing.
Consider ordering a separate bundle for starter shingles and ridge caps.
If your roof has many valleys or hips, increase your waste factor to 15% or more.

Fun Facts

"One 'Square' equals 100 square feet of roof surface."
"Most bundles of 3-tab shingles cover approximately 33.3 square feet."
"Standard waste factors are 10% for simple gable roofs and 15-20% for complex hip roofs."

Formula: Squares = [Area × (1 + Waste/100)] / 100 Bundles = Squares × 3

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