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Roofing Calculator

Estimate roof area, waste, and shingle squares.

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Roofing Calculator result

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Scenario AAll assumptions are visible.

Roof plan area (sq ft)Pitch multiplierWaste (%)Coverage per bundle (sq ft)Bundles per squarePrice per bundle ($)Underlayment coverage/roll (sq ft)Underlayment price/roll ($)

Primary result76Shingle bundles

Adjusted roof surface2,240 sq ftRoofing with waste2,508.8 sq ftRoofing squares25.1 squaresShingle bundles76Underlayment rolls6Estimated listed materials$3,512.48

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Formula, assumptions & limitations

Inputs used: Roof plan area (sq ft); Pitch multiplier; Waste (%); Coverage per bundle (sq ft); Bundles per square; Price per bundle ($); Underlayment coverage/roll (sq ft); Underlayment price/roll ($).

Method: Plan area × pitch multiplier estimates roof surface; waste is added before rounding shingles and underlayment to whole packages.

Aerial measurements and manufacturer instructions are more reliable. Excludes ridge cap, starter, flashing, vents, nails, tear-off, decking, permit, labor, delivery, and tax.

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How this tool works

Roof area is adjusted for slope and waste, converted to roofing squares, and rounded to purchasable bundle quantities where shown.

Limits to know

Plan area and pitch multiplier are screening measurements. Valleys, hips, ridges, starter, cap, flashing, vents, underlayment laps, code, tear-off, damaged decking, manufacturer instructions, and field measurements can change quantities.