Free Tool
Roofing Squares Calculator: How Many Shingles Do I Need?
Enter your roof's ground footprint and pitch — or its actual area — and get the number of roofing squares, shingle bundles, and waste to order. One square equals 100 square feet.
Roofing Squares Calculator
1 square = 100 ft² · footprint × pitch, or actual roof area
You'll Need
Squares = roof area ÷ 100, plus waste. Footprint mode multiplies by the pitch factor √(rise² + 12²) ÷ 12. Bundles default to 3 per square (typical architectural shingles).
Who this is for
Homeowners & prosBudget a re-roof with confidence
Know how many squares and bundles your roof needs before you call for quotes — so you can sanity-check every bid and understand what you're paying for.
Quote squares and bundles on site
Measure the footprint, pick the pitch, and get squares, bundles, and a priced total in seconds. In ServicePros Hub, the result drops straight into a proposal line.
How the math works
Roofers price by the square — and one square covers 100 square feet of roof.
If you only know the building's ground footprint, the roof itself is larger because it's sloped. We multiply the footprint by a pitch factor — √(rise² + 12²) ÷ 12 — to get the true sloped area. A 6/12 pitch, for example, multiplies the footprint by about 1.118. If you already have the actual roof area, switch the mode and skip the pitch step.
Squares = roof area ÷ 100, plus a waste allowance (12% is typical, more for complex roofs with lots of valleys and hips). Architectural shingles come 3 bundles to a square; the calculator rounds bundles up to whole units.
Roofing squares chart
Quick referenceUse these charts to sanity-check a measurement or a bid. Squares are shown before waste, then with a 12% waste allowance. Bundles assume 3 bundles per square (architectural shingles), rounded up.
Squares by house footprint and pitch
| Ground footprint | 4/12 pitch | 6/12 pitch | 8/12 pitch | Bundles at 6/12 |
|---|---|---|---|---|
| 1,000 ft² | 10.5 / 11.8 | 11.2 / 12.5 | 12.0 / 13.5 | 38 |
| 1,500 ft² | 15.8 / 17.7 | 16.8 / 18.8 | 18.0 / 20.2 | 57 |
| 2,000 ft² | 21.1 / 23.6 | 22.4 / 25.0 | 24.0 / 26.9 | 76 |
| 2,500 ft² | 26.4 / 29.5 | 28.0 / 31.3 | 30.0 / 33.7 | 94 |
| 3,000 ft² | 31.6 / 35.4 | 33.5 / 37.6 | 36.1 / 40.4 | 113 |
Each cell: squares before waste / with 12% waste. A 2,000 ft² footprint at a 6/12 pitch is about 22.4 squares, or 25 squares with waste.
Pitch factor chart
| Pitch | Multiply footprint by | Squares per 1,000 ft² footprint | Bundles per 1,000 ft² (12% waste) |
|---|---|---|---|
| 3/12 | 1.031 | 10.3 | 35 |
| 4/12 | 1.054 | 10.5 | 36 |
| 5/12 | 1.083 | 10.8 | 37 |
| 6/12 | 1.118 | 11.2 | 38 |
| 7/12 | 1.158 | 11.6 | 39 |
| 8/12 | 1.202 | 12.0 | 41 |
| 9/12 | 1.250 | 12.5 | 43 |
| 10/12 | 1.302 | 13.0 | 44 |
| 12/12 | 1.414 | 14.1 | 48 |
Pitch factor = √(rise² + 12²) ÷ 12. Steeper roofs have more surface for the same footprint, so they need more squares.
FAQ
Roofing estimatesWhat is a roofing square?
A roofing square is a unit of roof area equal to 100 square feet. Roofers estimate and price materials and labor by the square, so a 2,000 ft² roof is 20 squares before waste.
How many bundles of shingles are in a square?
Most architectural (dimensional) shingles come 3 bundles per square. Some heavier or specialty shingles run 4 or 5 bundles per square — adjust the "bundles per square" field to match your product.
How do I account for roof pitch?
If you measure the ground footprint, multiply it by the pitch factor √(rise² + 144) ÷ 12 to get the true sloped area. A steeper pitch means more roof area for the same footprint. The calculator applies this automatically in footprint mode.
How much waste should I add for shingles?
A 10–15% waste allowance is typical; 12% is a good default. Add more for cut-up roofs with many valleys, hips, and dormers, and for starter and ridge cap coverage.
How many squares is my roof?
Divide your total sloped roof area by 100. If you only know the footprint, multiply by the pitch factor first. A simple 1,600 ft² footprint at a 6/12 pitch is about 17.9 squares before waste.
How many squares is a 2,000 sq ft house?
It depends on the pitch and overhangs. A 2,000 ft² ground footprint is about 21.1 squares at a 4/12 pitch, 22.4 squares at 6/12 and 24.0 squares at 8/12, before waste. Add 10–15% for waste; at 6/12 with 12% waste that's about 25 squares, or 76 bundles.
How do I convert square feet to roofing squares?
Divide the roof's square footage by 100. 2,450 ft² of roof is 24.5 squares. If you only have the house footprint, multiply it by the pitch factor first (1.118 for a 6/12 roof), then divide by 100.
How many square feet does a bundle of shingles cover?
With 3 bundles per square, one bundle covers about 33.3 ft². Heavier shingles that come 4 or 5 bundles per square cover 25 or 20 ft² per bundle, so check the wrapper.
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