Roofing Shingle Calculator
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Estimated shingles needed
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shingle bundles
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Roof sq ft
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Sq ft incl. waste
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Roofing squares
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Shingle bundles
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What this estimate includes
This estimate shows roof square footage, roofing squares, and shingle bundles based on roof pitch, waste, and bundles per square.
How it’s calculated
Roof area = building footprint × pitch factor
Adjusted area = roof area × waste %
Roofing squares = adjusted sq ft ÷ 100
Bundles = roofing squares × bundles per square, rounded up
Before you order
Complex roofs with hips, valleys, dormers, skylights, and multiple slopes need more waste than a simple roof. Confirm measurements with a roofing professional before ordering.
Frequently Asked Questions
What is a roofing square?
One roofing square equals 100 square feet of roof area.
How many bundles are in a square?
Many asphalt shingles use 3 bundles per square, but some products use more. Check the product label.
Does roof pitch matter?
Yes. Steeper roofs have more surface area than the flat building footprint, so the calculator applies a pitch factor.
Disclaimer: This calculator provides estimates only. Actual quantities depend on product coverage, jobsite conditions, waste, and supplier details. Verify all quantities before ordering. See all outdoor material calculators.