What is a roofing square?

100 square feet of roof surface. Shingles are sold in bundles, with three bundles covering one square.

Does roof pitch change how much material I need?

Yes. A 6/12 roof has about 8% more surface than its footprint; a 10/12 roof has about 25% more.

Material Calculators

Roofing Squares Calculator

A roofing square is 100 square feet. Your roof area is bigger than your footprint because of pitch — this calculator applies the pitch factor for you.

Your numbers

Footprint length(ft)

Footprint width(ft)

Roof pitch

Waste allowance(%)

Roofing squares

17.9 squares

Roof area: 1,787 sq ft
Squares: 17.9 squares
Shingle bundles: 54 bundles3 bundles per square
Synthetic underlayment: 5 rolls400 sq ft rolls
Ridge cap: 60 linear ft

Complex roofs with valleys, dormers, and hips run closer to 15% waste.

Book a free estimate 865-440-0475

Quantities are planning estimates. Verify measurements on site and buy a little extra for cuts, waste, and future repairs.

Common questions

More tools like this

Paint Calculator

Gallons of paint and primer for a room, based on real wall area.

Drywall Calculator

Sheets, screws, joint compound, and tape for walls and ceilings.

Tile Calculator

Tile count, thinset, and grout for a floor, shower, or backsplash.

Free Estimates

Have a Repair or Renovation Project in Mind?

From small repairs to complete bathroom transformations, Homefficient Renovations is ready to help you improve your home.

Request Your Free Estimate Call 865-440-0475