Enter your roof dimensions and pitch to get the exact number of shingle bundles needed.
Roofing is measured in squares — one square equals 100 square feet. Most shingle bundles cover about 33 sq ft, so you need 3 bundles per square. Always add 10–15% for waste, hips, ridges, and valleys.
🏗️ Pro Tip: Add 10% waste factor for simple gable roofs, 15% for hip roofs, and up to 20% for complex roofs with dormers, valleys, or skylights. Order starter strips and ridge cap shingles separately — they're not included in standard square calculations. Synthetic underlayment costs more than felt but protects the deck if installation spans multiple days of weather exposure.