What Is a Square of Roofing?
Quick answer: one square = 100 square feet of roof surface. It's the standard unit roofers use for quotes — a 2,000 sq ft footprint house with a moderate pitch needs about 20–24 squares.
- The square defined
- Squares by house size
- Bundles per square
- Pitch and the footprint factor
- Waste and quotes
- Worked example: 2,000 sq ft house
- FAQ
The square defined
A square of roofing is 100 square feet of roof surface — not floor area. Roofers quote materials, labor and waste per square, which is why the unit exists: shingles are packaged to cover a square, and pricing stays in whole numbers.
Squares by house size
The roof surface area is bigger than the footprint once pitch is factored in. A 2,000 sq ft single-story footprint typically measures 2,000–2,400 sq ft of roof, or 20–24 squares. Two-story houses have smaller roofs per square foot of living space.
| House footprint | Roof area (moderate pitch) | Squares |
|---|---|---|
| 1,200 sq ft | 1,200–1,400 | 12–14 |
| 2,000 sq ft | 2,000–2,400 | 20–24 |
| 3,000 sq ft | 3,000–3,600 | 30–36 |
Bundles per square
Three bundles of 3-tab shingles cover one square; architectural (laminated) shingles take 3–4 bundles per square because they're heavier. The bundle label prints the coverage — use it. At 3 bundles per square, 20 squares = 60 bundles.
Pitch and the footprint factor
Roof area = footprint × a pitch factor: 4/12 pitch ≈ 1.06×, 6/12 ≈ 1.12×, 8/12 ≈ 1.20×. Steeper roofs cover more surface for the same footprint. Measure the actual planes when accuracy matters — the roof calculator does the pitch math for you.
Waste and quotes
Add 10% for cuts at valleys, hips and ridge lines. Quotes are usually per square, so knowing your square count lets you compare bids and check material orders — ask for the square count on any roofing estimate.
Worked example: a 2,000 sq ft house, 6/12 pitch
- Footprint = 2,000 sq ft
- Roof area = 2,000 × 1.12 ≈ 2,240 sq ft
- ÷ 100 = 22.4 → 23 squares
- + 10% waste → 25 squares ≈ 75 bundles (3-tab)
FAQ
One square of roofing is 100 square feet of roof surface. It's the standard unit roofers use to quote materials and labor — a 2,000 sq ft house needs about 20–24 squares.
About 20–24 squares, depending on pitch. A 2,000 sq ft footprint typically measures 2,000–2,400 sq ft of roof surface; divide by 100 for squares, then add 10% waste.
Three bundles of standard 3-tab shingles make one square; architectural shingles take 3–4 bundles per square. Check the bundle label for coverage.
Measure the roof surface area (footprint times a pitch factor, or measure each plane), divide by 100 for squares, then add 10% waste.
Because shingles are sold in bundles of 100 sq ft (a square), and quotes, labor and waste are all priced per square. It avoids re-converting every number.