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Roofing Underlayment Calculator

Enter project measurements to calculate an estimated material requirement.

Building length (m)

Building width (m)

Roof pitch (degrees)

Coverage per sheet/bundle (m²)

Waste (%)

Formula

Roof area = plan area ÷ cos(pitch); units = adjusted area ÷ coverage

Planning estimate only. Verify quantities, local building codes, manufacturer coverage and site conditions before purchasing or construction.