Roofing Squares and Shingle Bundle Calculator

A roofing square is 100 square feet of roof surface. Shingles, underlayment and labor are commonly priced per square, so converting your roof area into squares makes ordering and quoting easier.

Most architectural shingles take three bundles to cover one square. Some heavier or specialty shingles need four or five bundles, so check the wrapper and set the bundles per square to match.

Use the roof area measured along the slope, which is larger than the building footprint. A steeper pitch adds more surface, so a sloped measurement or a pitch multiplier gives the right number of squares.

Around 10 percent suits a simple gable roof. Roofs with many hips, valleys, dormers or a steep pitch waste more, so 15 percent or higher is common on a cut-up roof.

No. This counts field shingle bundles only. Ridge cap, starter strip, underlayment, drip edge and flashing are ordered separately based on the ridge, hip, eave and rake lengths of your roof.