Roofing Shingle Bundle Calculator
- Roof area (slope)
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- Squares (100 sq ft)
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- Bundles
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- Underlayment rolls (4 sq/roll)
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Slope multiplier = √(rise² + run²) ÷ 12. Add 10% waste for hips/valleys, 15% for complex roofs.
About this tool
Roofing Shingle Bundle Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Trade & Construction Calculators. Browse more Trade & Construction Calculators tools.