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Shingle Calculator — Bundles, Ridge Caps & Nails
Calculate architectural and 3-tab shingle bundles, ridge caps, and roofing nails.
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CONSTRUCTION & CODE
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Project Specifications
Shingle Bundle Formula
Transparent mathematical methodology explained in plain English.
Bundles = Roofing Squares × 3 Bundles/Square × (1 + Waste %) Most architectural and 3-tab asphalt shingles are packaged at 3 bundles per square (33.3 sq ft per bundle).
Variables Explained:
- Ridge Caps: Add 1 bundle of ridge shingles per 30-35 linear feet of ridge and hip lines.
Real Project Example
Roofing a 20-Square Gable Roof
Estimating bundles and nails for an architectural shingle replacement.
Sample Project Inputs:
Roof Squares: 20 (2,000 sq ft)
Ridge Length: 40 ft
Waste: 10%
Step-by-Step Calculation:
- Field bundles: 20 squares × 3 bundles = 60 bundles.
- With 10% waste: 60 × 1.10 = 66 bundles.
- Ridge caps for 40 ft: 40 ÷ 30 = 1.33 -> 2 bundles.
- Total bundles: 66 + 2 = 68 bundles.
- Nails: 20 squares × 2.5 lbs = 50 lbs roofing nails.
Calculated Answer: Order 68 bundles of shingles and 50 lbs of 1-1/4" roofing nails.
Knowledge Base
Frequently Asked Questions: Shingle Calculator
Click any question below to expand quick answers, formulas, and expert tips.
How many bundles of shingles are in a square?
Standard 3-tab and architectural laminated shingles are packaged at 3 bundles per square. Heavy luxury or slate-look shingles may require 4 or 5 bundles per square.