Roof Squares Calculator
Convert roof area to roofing squares (1 square = 100 sq ft). Calculate squares, bundles, and nail quantities with waste. Imperial-first with metric conversion. Free, no signup.
Roof Area Calculator
Calculate actual roof surface area from plan dimensions and pitch
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Roofing squares — did you know?
What is a roofing square?
A roofing square is 100 square feet of roof area. It is the standard unit for ordering shingles and estimating US roofing jobs. 1 square = 100 sq ft = 9.29 m². To convert m² to squares: divide by 9.29.
Squares to bundles
Most architectural shingles: 3 bundles per square. 3-tab: 3-4 bundles per square. Premium/luxury: 4-5 bundles. Always check the bundle label — coverage varies by manufacturer.
Calculating squares from plan
First get actual roof area: plan_area × pitch_factor. Then convert to squares: area_sqft ÷ 100. At 1,500 sq ft plan, 6:12 pitch (factor 1.118): 1,500 × 1.118 = 1,677 sq ft = 16.77 → 17 squares.
Waste in squares
Add 10-15% waste to squares before ordering. 17 squares at 12% waste: 17 × 1.12 = 19.04 → 20 squares → 60 bundles. Round up — partial squares are still charged full price.
Formulas used
Squares from area
squares = ceil(roof_area_sqft ÷ 100)
Squares with waste
total = ceil(squares × (1 + waste%))
Bundles
bundles = total_squares × bundles_per_square
m² to squares
squares = m² ÷ 9.29
Frequently asked questions
What is a roofing square?
100 sq ft of roof area. Standard US roofing unit. 1 square = 100 sq ft = 9.29 m².
How many bundles per square?
Most architectural shingles: 3 bundles. 3-tab: 3-4. Premium: 4-5. Check packaging.
How do I convert m² to squares?
Divide by 9.29. 100 m² = 10.77 squares. Round up to 11.
Best free roof squares calculator?
One that converts area to squares, adds waste, and calculates bundles. This tool does all, free.