About Roofing Shingle & Pitch Calculator
Calculate true roof surface area from building footprint and roof pitch. Computes roofing squares (100 sq ft), 3-tab and architectural shingle bundles, underlayment rolls, and ridge caps.
Key Capabilities & Features
- Pitch slope multiplier: 3/12, 4/12, 6/12, 8/12, 10/12, and 12/12 pitch options
- Eave and gable overhang allowance adjustments
- Calculates roofing squares (1 square = 100 sq ft)
- Shingle bundle estimation (3 bundles per square)
- Underlayment rolls (1000 sq ft) and ridge cap linear footage
How to Use Roofing Shingle & Pitch Calculator
1
Enter Footprint
Provide building ground length and width in feet.
2
Select Pitch
Choose roof pitch ratio (rise over 12" run, e.g. 6/12).
3
Pick Roof Style
Select simple gable (10% waste), hip roof (15%), or complex roof (20%).
4
View Materials
Get total roofing squares, shingle bundles, and felt underlayment rolls.
Privacy & In-Browser Execution Guarantee
100% client-side calculation. Your project measurements never leave your device.
Frequently Asked Questions
What is a "square" of roofing?
In roofing terminology, one "square" is equal to exactly 100 square feet of roof surface area.
How many bundles of shingles are in a square?
Standard architectural and 3-tab asphalt shingles are packaged at 3 bundles per roofing square (33.3 sq ft per bundle).
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