A square in roofing is 100 square feet. This is the standard unit that roofers use to measure roof size and cost. If your roof is 1,700 square feet, that means you have 17 squares. Roofers charge by the square, so knowing this number helps you understand your roof cost. Most homes have roofs between 20 and 30 squares. Understanding squares makes it easier to get accurate quotes and compare prices.
Why Do Roofers Use Squares?
Roofers use squares because they make math easier. Instead of saying “1,700 square feet,” they say “17 squares.” This simple number helps them calculate labor and material costs faster. According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet or 26.47 squares. This standard measurement has been used for over 100 years in the roofing industry.
Squares also help homeowners compare prices. When you get multiple quotes, contractors will list costs per square. This makes it simple to see which bid is better. Two roofers charging different prices can be easily compared using the square measurement.
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How Do You Calculate Your Roof Size?
To find your roof size in squares, measure your roof’s total square footage. Then divide by 100. For example, if your roof is 2,000 square feet, you have 20 squares. You can also ask your contractor to measure your roof. They use tools to get exact numbers quickly.
Many homeowners use their home’s square footage as a rough estimate. A 2,000 square foot house usually has a roof around 2,200 to 2,400 square feet, depending on roof pitch. Steeper roofs are bigger because they have more surface area.
What Does a Square Cost?
According to RubyHome (2025), roof installation costs range from $4 to $40 per square foot. For a basic asphalt shingle roof, you might pay $4.25 to $4.95 per square foot. This means one square (100 sq. ft.) costs between $425 and $495 for asphalt shingles.
| Material Type | Cost Per Square Foot | Cost Per Square (100 sq. ft.) |
|---|---|---|
| Basic Asphalt Shingles | $4.25-$4.95 | $425-$495 |
| Architectural Asphalt | $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 |
Why Size Matters for Your Budget
Your roof size in squares directly affects your total cost. According to RubyHome (2025), the average roof replacement cost is $9,526. For a 1,700 square foot roof (17 squares), you might pay between $6,800 and $68,000 depending on materials. Labor costs also depend on roof size. Bigger roofs take more time and workers.
Knowing your squares helps you budget better. If a contractor quotes you $500 per square for asphalt shingles on a 20-square roof, that total is $10,000. This makes it easy to plan and save money for your project.
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Contact a qualified roofing solutions for expert guidance on roof repair, replacement, or installation.