Roofing Calculator
Estimate roofing materials for your project. Enter roof dimensions and pitch to get adjusted roof area, squares, shingle bundles, and total cost. Supports 3-tab and architectural shingles with pitch multipliers.
Frequently Asked Questions
How much does roofing cost per square foot?
Roofing installation costs $3 to $7 per square foot for asphalt shingles, or $300 to $700 per roofing square (100 sq ft). Materials alone are $100 to $200 per square.
How many shingle bundles per square?
Three-tab shingles typically use 3 bundles per square. Architectural shingles use 4 bundles per square due to higher coverage per bundle of 25 sq ft.
What is a roofing square?
A roofing square equals 100 square feet of roof surface. Contractors price materials and labor by the square.
How much waste factor should I add for roofing?
Add 10% waste for simple gable roofs and 15% for complex hip or cut-up roofs with multiple valleys and ridges.
How does roof pitch affect shingle quantity?
Steeper pitches have more actual surface area than the flat footprint. A 12/12 pitch requires 41% more material than the same footprint at ground level.