Roofing Calculator
Calculate squares of shingles and materials needed based on roof footprint and pitch
Measurement Method
Roof Pitch
Pitch factor: 1.054× — a 4:12 pitch adds 5% more surface area than the footprint.
Shingle Type & Waste
%
10% simple roof · 15–20% for hips/valleys🏘️
Enter your roof dimensions to calculate materials
Tips & Notes
- •1 roofing square = 100 sq ft. Most shingles are sold 3 bundles per square.
- •Add 10% waste for a simple gable roof; 15–20% for hips, valleys, or dormers.
- •Architectural (dimensional) shingles last 25–30 years vs. 15–20 for 3-tab.
- •Check local building codes — most require ice and water shield at eaves in cold climates.
- •Never roof over more than 2 layers of shingles — strip to deck for best results.
Recommended Products
Popular items for this project — links may earn a commission.
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Materials & Supplies
Kimllier Coil Roofing Nails — 3600 Count, 1-3/4"
15-degree, .092" ring shank, hot-dipped galvanized, full round head
$35Amazon
Grip-Rite Galvanized Coil Roofing Nails — 7200 Count
1-3/4", 15-degree, smooth shank, galvanized finish, professional grade
$55Amazon
BHTOP Coil Roofing Nails — 3600 Count, 1-1/4"
15-degree round head, smooth shank, electro galvanized, for nail gun
$30Amazon
Grip-Rite Synthetic Roofing Underlayment 48"x250'
Slip-resistant, UV-treated woven polypropylene, covers 1,000 sq ft
$70Amazon