How many bundles of shingles are in a square?

Most architectural and three-tab asphalt shingles come three bundles to a square, where a square covers 100 square feet of roof. Some heavier designer and premium shingles run four or even five bundles per square because each bundle weighs less, so always check the specific product.

To estimate bundles, measure your roof area in square feet, divide by 100 to get squares, multiply by three, then add about 10 to 15 percent for waste, starter strips, hip and ridge caps, and cut-off. On a complex roof with many valleys, lean toward the higher waste factor.

Buy from the same production lot when you can, so the color blend matches across the whole roof.