Roofing Calculator - Estimate Shingles, Squares & Materials

How to Use the Roofing Calculator

1. Enter roof dimensions — length and width of each roof plane
2. Set roof pitch — rise in inches per 12 inches of run
3. Get materials — squares, shingle bundles, underlayment, cap

Perfect for roofing contractors, homeowners planning a replacement, and material estimators. All calculations run in your browser — nothing is uploaded.

Features

• Roof pitch adjustment — accounts for slope factor
• Squares calculation — industry standard (1 square = 100 sq ft)
• Bundle count — estimates based on 3 bundles per square
• Underlayment — #15 felt roll count
• Ridge cap — linear feet of cap shingles
• Waste allowance — automatically adds 10%