Technical Free

Roof Squares Calculator

Converts any roof area (measured or calculated) to roofing squares. Roofing industry standard unit — 1 square equals 100 square feet.

Use actual sloped area, not footprint. Need help? Use the Roof Area Calculator.

Results

Exact Squares
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Round Up (Order)
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squares
Bundles (3/sq)
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Bundles (4/sq)
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Standard 3-tab and most architectural shingles use 3 bundles per square. Some heavyweight shingles use 4 bundles per square. Check the manufacturer specs for your specific product.

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How to Use This Calculator

1. Enter your roof area in square feet. This should be the actual sloped area, not the building footprint. If you only have the footprint, use the Roof Area Calculator first to apply the pitch correction.

2. Read the results. The calculator shows exact squares, rounded-up squares for ordering, and the number of bundles needed at both 3 and 4 bundles per square.

3. Order materials. Always use the rounded-up number. Ordering partial squares means buying extra bundles anyway, and you always need a few extra for waste and starter courses.

How Roofing Squares Work

The roofing industry prices everything in squares. One square equals 100 square feet of roof area. When a supplier quotes shingles at $120 per square, that means $120 per 100 sq ft of coverage.

Roofing_Squares = Roof_Area_sqft / 100

Bundles_Needed = Roofing_Squares x 3 (standard shingles)

Labor is also quoted per square. A crew charging $300 per square on a 25-square roof means $7,500 in labor. Knowing your exact square count is the foundation of every roofing estimate.

Frequently Asked Questions

What is a roofing square?
A roofing square is a unit of measurement equal to 100 square feet. It is the standard unit used to price roofing materials and labor. A 2,500 sq ft roof equals 25 squares.
How many bundles of shingles per square?
Standard asphalt shingles require 3 bundles per square (100 sq ft). Some heavier architectural shingles may require 4 bundles per square. Check the manufacturer label for exact coverage per bundle.
How do I convert square feet to roofing squares?
Divide the total roof area in square feet by 100. For example, 3,200 sq ft divided by 100 equals 32 roofing squares. Always round up to the next whole number when ordering materials.

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