Roofing Shingle Calculator - Squares, Bundles & Pitch Multiplier
Calculate roofing squares (100 sq ft), shingle bundle quantities, ridge caps, and underlayment rolls based on ground footprint, roof pitch slope, and waste allowance.
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⚙️ Configuration & Inputs
sq ft
%
📊 Results & Analysis
Shingle Bundles Required
72 Bundles
23.8 Roofing Squares (with 10% waste)
| Adjusted Roof Area | 2,160 sq ft |
| Roofing Squares (100 sq ft) | 21.6 Squares |
| Total Squares (with Waste) | 23.8 Squares |
| Shingle Bundles (3 per Square) | 72 Bundles |
| Underlayment Felt (400 sq ft rolls) | 6 Rolls |
| Ridge Cap Shingles (Linear ft) | ~75 Linear ft (3 Bundles) |
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Understanding Roofing Squares & Bundles
In the North American roofing industry, roof surfaces are measured in Squares, where one square equals exactly 100 square feet.
Total Bundles = Roofing Squares × 3 Bundles per Square
Standard architectural laminate shingles are packaged at 3 bundles per square. Standard heavyweight shingles weigh approximately 60 to 80 lbs per bundle, making an entire roof order weigh between 4,000 and 7,000 lbs.
Frequently Asked Questions
Because a roof rises at an angle, its surface area is always greater than the flat ground footprint beneath it. A 6/12 roof pitch has approximately 8% more surface area, while a steep 12/12 pitch has 30% more surface area.
Most manufacturers require 4 nails per architectural shingle in normal conditions, and 6 nails per shingle in high-wind zones (above 110 mph). That equates to roughly 320 to 480 nails per roofing square.