Frequently Asked Questions
How many bundles of shingles do I need for a 1,500 sq ft roof?
At 6/12 pitch (slope factor 1.118): 1,500 x 1.118 = 1,677 sq ft. With 15% waste: 1,929 sq ft / 100 = 19.3 squares x 3 bundles = 58 bundles.
What is a roofing square?
One roofing square equals 100 sq ft of actual roof surface. Standard asphalt shingles come 3 bundles per square.
What waste factor should I use for shingles?
Use 10-12% for simple gable roofs, 15% for hip roofs, and 20-25% for complex roofs with dormers and valleys.
How does roof pitch affect shingle quantity?
A steeper pitch means more actual surface area than the footprint. A 12/12 pitch has 41% more surface area than its horizontal projection.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.