Roofing shingles. Standard grade 3 per square. Architectural 4 per square.
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Standard fiberglass shingles come 3 bundles to the square.
Most have 3 bundles per square. Heavy duty or architectural shingles from some manufactures have 4 bundles per square.
There are 3 bundles in a square if you are using 3 tab. 4 bundles if you are using Architectural.
Typically there are three (3) bundles per square (100 sq ft)
You buy shingles by the square. Three bundles cover one square. A square is 10x10. So four bundles should be more than enough.