In a roofing square, there are three bundles. A roofing square is the term used to measure roof area, and it equals 100 square feet. Three bundles of shingles cover one square. Each bundle contains about 29 to 33 shingles, depending on the type. Most roofers work in squares because it makes math easy and prices clear. Knowing this helps you plan your roof project the right way.
What Is a Roofing Square?
A roofing square is a unit that measures 100 square feet. This is the standard way roofers measure roof size and materials.
According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet or 26.47 squares. This means most homes need about 26 to 27 squares of material.
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How Many Bundles Do You Need for One Square?
Three bundles equal one square. This is true for most asphalt shingle types used in the United States.
Each bundle holds shingles that cover about 33 square feet. When you put three bundles together, you get 100 square feet, which is one full square. This makes it easy to order the right amount.
What Material Types Use Three Bundles Per Square?
Most common shingles use three bundles per square. According to industry data, asphalt shingles make up about 80% of roofing projects in the United States. Three-tab shingles and architectural shingles both use this 3-bundle rule.
| Shingle Type | Bundles per Square | Cost per Square |
|---|---|---|
| Three-tab asphalt | 3 | $127-$149 |
| Architectural asphalt | 3 | $135-$248 |
| Metal panels | Varies | $300-$510 |
| Wood shingles | 4 | $326-$429 |
How Do You Calculate Total Bundles Needed?
Take your total roof size in square feet and divide by 100. Then multiply by three.
For example, a 1,700 square foot roof equals 17 squares. Seventeen squares times three bundles equals 51 bundles total. According to RubyHome, roof installation costs range from $4 to $40 per square foot, which includes labor and materials. Knowing your bundle count helps you get accurate pricing from roofers.