Roofing Squares Calculator

Calculate roofing squares, shingle bundles, underlayment rolls, ridge cap bundles, and drip edge linear feet. Accounts for roof pitch and 10% waste.

Shingle Type

3 bundles per square

Underlayment Type

1,000 sq ft per roll

Roof Pitch

Pitch factor: ×1.054 — actual roof area is 5.4% larger than footprint

Roof Length (ft)

Roof Width (ft)

Ridge Length (ft)

How It Works

• Measure the footprint from the ground — don't walk a steep roof to measure.
• Add extra waste for hips, valleys, and dormers (up to 15%).
• Drip edge installs on eaves first, then rakes over underlayment.
• Starter strip is separate from shingle count — add 1 bundle per 100 LF of eave.