Roofing Material Estimator (Squares, Underlayment, Fasteners)

Roofing Material Estimator

Enter the building footprint, pick a roof pitch, and the calculator returns squares of shingles, synthetic underlayment rolls, ice and water shield, drip edge, and 1-1/4 in coil nails.

Building footprint (sq ft)

Roof pitch (rise per 12)

Total eave length (ft)

Total rake length (ft)

Ice and water courses (3 ft each)

Waste allowance (%)

Materials

Pitch multiplier—

Roof area (with waste)—

Squares—

Shingle bundles (3/sq)—

Synthetic underlayment (10-sq rolls)—

Ice and water shield (sq ft)—

Drip edge (linear ft)—

1-1/4 in roofing nails—

Last reviewed: April 2026

Tools we used or recommend for this work: GAF Timberline HDZ or CertainTeed Landmark architectural shingles in the bundle count this calc returned, GAF Tiger Paw underlayment (or felt for budget jobs), GAF StormGuard ice & water shield at the eaves, an aluminum drip edge in the linear feet calculated, and a Milwaukee M18 roofing nailer for the install. Links may be affiliate-tagged where the brand has a program.