Roofing Shingles Calculator
Enter your roof area and shingle coverage per bundle to estimate bundles needed, including a waste allowance.
Roofing Shingles Calculator
Estimate the number of shingle bundles needed for a roofing job.
This is an estimate for general informational purposes only, not a professional quote. Round the final bundle count up to the next whole bundle, and consult a roofing professional for complex rooflines with many hips, valleys, or dormers, which need more waste allowance.
Shingles are sold in bundles that each cover a fixed area (commonly around 33.3 sq ft per bundle, so 3 bundles per roofing square). This calculator adds a waste allowance to account for cuts, overlaps, and hips/valleys.
Example
- With the default values shown above, this calculator returns: Bundles Needed (before waste) ≈ 60.1; Bundles Needed (with waste allowance) ≈ 66.1.
Frequently Asked Questions
How much waste allowance should I use?
A simple gable roof may need as little as 10% extra, while a complex roof with many hips, valleys, or dormers may need 15-20% or more to account for additional cuts.
What is a “roofing square”?
A roofing square is a unit equal to 100 square feet of roof area — professionals often quote jobs by the number of squares, which equals roughly 3 standard shingle bundles.