Roofing Squares and Bundles

Squares, bundles per shingle product, underlayment rolls, drip edge.

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Formula and source

Squares = roof_area / 100 ft² + pitch-based waste factor; bundles = squares × bundles_per_square (typically 3 for 3-tab, 3-4 for architectural). Underlayment + drip edge from linear quantities.

ARMA (Asphalt Roofing Manufacturers Association) Residential Asphalt Roofing Manual by name. IRC 2021 (International Residential Code). §R905.

Audience

This tile is built for carpentry and the adjacent professions in the Carpentry and Construction group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.