Convert your roof area into roofing squares and materials. One roofing square equals 100 square feet of roof surface. Enter your roof footprint and pitch to get squares, shingle bundles (with waste), underlayment, and nails — or measure your roof automatically from satellite with SquareCount.
One roofing square equals 100 square feet of roof surface. Divide your total pitch-adjusted roof area by 100 to get your squares.
Most architectural shingles come 3 bundles per square, so a 20-square roof needs about 60 bundles plus a waste allowance (typically 10%).