Shingle Calculator
Calculate exactly how many bundles and squares of shingles you need. Enter your roof square footage and we'll handle pitch, waste, and starter strip.
Actual roof surface, after applying pitch multiplier.
For starter strip calculation.
- Squares (raw)
- 25.00
- Squares (with waste)
- 27.50
- Main field bundles
- 83
- Starter strip bundles
- 2
- Ridge cap bundles
- 2
- Total bundles
- 87
How Many Shingles Do I Need?
The quick answer: divide your roof surface area by 100 to get squares, then multiply by 3 for standard 3-tab shingles or 3-4 for architectural shingles to get bundle count. Always add 10-15% for waste, and don't forget starter strip and ridge cap.
Bundle Coverage
- 3-tab shingles: 3 bundles per square (100 sq ft)
- Architectural shingles: 3 bundles per square for most lines, 4 for heavy/premium
- Starter strip: 1 bundle covers about 105 linear feet of eave and rake
- Ridge cap shingles: 1 bundle covers about 30 linear feet of ridge
Why Waste Factor Matters
Every roof has cuts, overlaps, and mistakes. Simple gable roofs need 10% waste. Complex roofs with dormers, valleys, and hips need 15-20%. Running out of shingles mid-job is worse than returning an unopened bundle.
Skip the Calculator Entirely
This calculator is free and always will be. But if you want to save time on every roof you quote, SnapQuote's AI generates the entire scope-of-work and proposal from your photos in 60 seconds. No manual math, no templates.
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