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How Many Square Feet In A Roofing Square

November 28, 2025

2 min read

dilshadakram

A roofing square is 100 square feet. This is the standard unit roofers use to measure roof size. When you hear roofers talk about your roof in squares, they mean groups of 100 square feet. The average U.S. roof size is 2,647 square feet, or about 26.47 squares, according to the National Association of Home Builders. Understanding squares helps you know the real cost of your roof project. Most roof replacements cost between $5,868 and $13,217, but the price depends on how many squares your roof has.

Why Use Roofing Squares?

Roofers use squares to make pricing simple and fast. Instead of saying your roof is 2,000 square feet, they say it is 20 squares.

This makes it easy to compare prices. A contractor might quote you $400 per square for asphalt shingles. That means your 20-square roof costs $8,000 for materials and labor. The pricing system helps homeowners understand what they are paying for.

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How to Calculate Your Roof in Squares

Finding your roof size is simple math. Measure the length and width of your roof from the ground. Multiply length times width. Then divide by 100 to get your square count.

For example, a 1,700 square foot roof equals 17 squares. According to RubyHome, roof installation costs range from $4 to $40 per square foot, which means your 1,700 square foot roof could cost $6,800 to $68,000 depending on materials.

You can also look at your property deed or tax records. Most homes have this information listed.

Material Costs by Square

Different roofing materials have different costs per square. Asphalt shingles are the cheapest. Basic asphalt costs $4.25 to $4.95 per square foot, while architectural asphalt shingles run $4.50 to $8.25 per square foot, according to RubyHome.

Metal roofs cost more upfront but last longer. Standing seam metal panels cost $10.00 to $17.05 per square foot. Slate tiles are the most expensive at $12.00 to $22.00 per square foot. Here is a quick price chart:

MaterialCost Per Square FootCost Per Square (100 sq ft)
Basic Asphalt$4.25, $4.95$425, $495
Architectural Asphalt$4.50, $8.25$450, $825
Metal Roofing$10.00, $17.05$1,000, $1,705
Slate Tiles$12.00, $22.00$1,200, $2,200

What Else Affects Roof Cost?

Your total roof cost depends on more than just squares and materials. Labor, location, and roof shape all matter. According to the U.S. Bureau of Labor Statistics, roofers earn a mean hourly wage of $26.85, which affects labor costs in your area.

Steep roofs take longer to install and cost more. Storm damage or bad weather can also raise your price. Asphalt shingles dominate the market at about 80 percent of all roofing projects, according to RubyHome, so most roofers are experts with this material and can price it quickly.

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If you need help with your roof, reach out to a trusted professional roofer for clear pricing and reliable service.