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How Big Is A Roofing Square

November 28, 2025

2 min read

dilshadakram

A roofing square is 100 square feet. This is the standard unit that roofers use to measure and price roof jobs. If you have a 1,700 square foot roof, that equals 17 squares. Roofers talk about squares instead of total square feet because it makes the math easier. One square covers enough area to shingle a space that is 10 feet by 10 feet.

Why Do Roofers Use Squares?

Roofers use squares as a measurement because it simplifies pricing and planning. Instead of saying a roof costs $4 to $40 per square foot, they can say it costs $400 to $4,000 per square. This makes it faster to give quotes.

The term “square” comes from old building trades. It is still used today across the roofing industry.

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How Many Squares Is Your Roof?

According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet or 26.47 squares. To find your roof size in squares, divide your total square footage by 100. For example, a 1,700 square foot roof is 17 squares.

Most homes have roofs between 15 and 40 squares. Smaller homes might have 12 squares. Larger homes could have 50 or more squares.

What Does a Square Cost?

According to RubyHome, roof installation costs range from $4 to $40 per square foot. That means one square costs $400 to $4,000 installed. The price depends on the material you pick and where you live.

Here are common roofing materials and their costs per square:

MaterialCost Per Square FootCost Per Square (100 sq ft)
Basic asphalt shingles$4.25, $4.95$425, $495
Architectural asphalt shingles$4.50, $8.25$450, $825
Metal roofing$5.50, $17.05$550, $1,705
Slate tiles$12.00, $22.00$1,200, $2,200

Example Roof Cost

Let’s say your home has a 2,000 square foot roof. That is 20 squares. If basic asphalt shingles cost $450 per square, your total cost would be $9,000 (20 squares x $450). According to RubyHome, the average roof replacement cost is $9,526, which matches this example well.

Remember that labor, materials, and local prices all affect the final bill. Getting quotes from three roofers helps you compare costs fairly.

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Contact a qualified professional roofer for expert guidance on roof repair, replacement, or installation.