Shingles Calculator

Bundles, Squares & Waste Factor for Asphalt Shingles

The Shingles Calculator tells you exactly how many bundles and how many squares of asphalt shingles you need for a roofing job. Enter your total roof area in square feet plus a waste factor (10% for simple gables, 15% for hip roofs, 20%+ for cut-up roofs with multiple valleys and dormers) and the tool returns the bundle count, square count, and recommended overage. Three bundles cover one square of standard 3-tab or architectural shingles. Pair this with our Ridge Cap, Starter Strip, and Nails calculators for a complete bill of materials.