To calculate roofing squares, divide your roof size by 100 since one square equals 100 square feet. Most roofing contractors measure roofs in squares instead of total square footage because it makes ordering materials and pricing easier. According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet or 26.47 squares. Learning to calculate squares helps you understand roof costs and compare contractor bids accurately.
What Is a Roofing Square?
A roofing square is simply 100 square feet of roof space. Contractors use this unit of measurement across the entire roofing industry.
Think of it like buying carpet by the yard instead of by the inch. It is easier and faster for professionals.
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How to Measure Your Roof Size
Start by finding the square footage of your roof. You can do this by measuring the length and width of each section of your roof, then multiply length times width. Add all sections together to get total square footage.
For example, if your roof measures 1,700 square feet total, you would have 17 squares. The math is simple: 1,700 divided by 100 equals 17.
Why Contractors Use Squares for Pricing
Roofing material costs are quoted per square. According to RubyHome, roof installation costs range from $4 to $40 per square foot, or $400 to $4,000 per square. When you know your square count, getting accurate price quotes becomes much easier.
Material prices also vary by type. Here is what different materials cost per square:
| Material Type | Cost Per Square |
|---|---|
| Basic Asphalt Shingles | $425, $495 |
| Architectural Asphalt | $450, $825 |
| Metal Roofing | $1,000, $1,705 |
| Concrete Tiles | $1,100, $1,980 |
| Slate Tiles | $1,200, $2,200 |
Real Cost Example
According to RubyHome, the average roof replacement cost is $9,526, with a typical range from $5,868 to $13,217. For a 1,700 square foot roof (17 squares), expect costs between $6,800 and $68,000 depending on materials chosen.
Most homeowners choose asphalt shingles since they are affordable. According to RoofLink, asphalt shingles dominate nearly 73% of U.S. residential roofing. If your 17-square roof uses basic asphalt, you would pay around $7,225 to $8,415 for materials and labor combined.
Understanding squares helps you budget and compare quotes from different contractors. Always ask contractors for their price per square so you can see exactly what you are paying.
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Talk with a local roofing contractor to review your options and get a detailed estimate for your project.