construction

Roofing Square

A unit of measurement equal to 100 square feet, used in the roofing industry to estimate materials.

A roofing square = 100 square feet of roof area. Roofers use this unit to price materials and labor consistently.

How to Calculate

1. Measure roof footprint (length Γ— width)
2. Multiply by pitch factor (e.g., 4/12 pitch = Γ—1.054, 6/12 = Γ—1.118, 8/12 = Γ—1.202)
3. Divide total sq ft by 100 = number of squares

Materials per Square

  • 3-tab shingles: 3 bundles per square
  • Architectural shingles: 3–4 bundles per square
  • Underlayment: 1 roll per 2–4 squares

Related Calculators

Related Terms