How to estimate roofing shingles
Roofing is sold by the square, where one square covers 100 square feet. The pitch factor increases the flat building footprint to approximate sloped roof area; the waste allowance covers cuts, valleys, hips, and damaged shingles.
Bundles and underlayment
Most standard shingles require three bundles per square, but premium products can differ. Confirm the bundle coverage printed by the manufacturer. Order underlayment for at least the calculated roof area.
Related project tools
Square footage · Paint · Concrete
Frequently asked questions
Should I add extra material?
Yes. Most projects need an allowance for cuts, breakage, uneven surfaces, overlap, or measurement error. The appropriate percentage depends on the material and layout.
Can I use this estimate to place an order?
Use it to plan and compare costs, then verify package coverage and project requirements with the manufacturer, supplier, or qualified contractor before a large purchase.