Quick answer
A roofing square equals 100 square feet of roof area. Most three-tab shingles use about 3 bundles per square, while architectural shingles may need more depending on the product.
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Roofing square
A measurement unit equal to 100 square feet of roof area.
Bundle
A package of shingles; bundle coverage depends on shingle type and manufacturer.
Waste factor
Add 10-15% for standard roofs and more for valleys, hips, dormers, and complex cuts.
Common questions
How many bundles are in a square?
Many three-tab shingles use 3 bundles per square, but always check the product label.
Does roof pitch affect bundles?
Pitch affects true roof area, which then affects the number of squares and bundles.