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Roofing Squares Calculator
Calculate roofing squares and bundles from home size and pitch. Includes waste factor and installed cost estimate for architectural shingles.
Educational calculators — always consult a licensed professional before making financial decisions.
Home footprint ~1,200 sq ft. Roof area (before pitch) is roughly 12 squares at standard pitch.
Pitch multiplier 1.03–1.05. Nearly flat; minimal area increase over footprint.
Two plain sloping sides with no valleys or dormers. Minimal cutting waste.
Installed cost estimate
$6,750 – $10,500
Architectural shingles, installed — adjust for other materials
1 roofing square = 100 sq ft. Standard architectural shingles use 3 bundles per square. Some premium shingles require 4 bundles — verify with your supplier.
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How it works
Enter home size
Input your home's footprint square footage and roof pitch.
Set waste factor
Add 10% for simple roofs, up to 20% for complex hips, valleys, and cut-offs.
Get squares and bundles
See total roofing squares needed and how many shingle bundles to purchase.
Frequently Asked Questions
What is a roofing square?+
A roofing square is a unit of measurement equal to 100 square feet of roof surface. It is the standard unit used by roofing contractors for pricing and material estimation. To calculate squares, divide your total roof area in square feet by 100. A 2,500 sq ft roof equals 25 roofing squares.
How do I calculate roofing squares?+
Calculate roofing squares in three steps: (1) Measure the length and width of each roof plane and multiply to get area. (2) Apply the pitch multiplier (e.g., 1.118 for 6/12 pitch). (3) Add your waste factor (10–20%). Then divide by 100 to get squares. Example: 40 × 30 ft roof, 6/12 pitch = 1,200 × 1.118 × 1.10 = 1,476 sq ft ÷ 100 = 14.8 squares, round up to 15.
How many bundles of shingles per roofing square?+
Standard architectural and 3-tab shingles require 3 bundles per roofing square. Each bundle covers approximately 33 sq ft. Some premium or designer shingles require 4 bundles per square. Always check the product label for coverage — shingle bundle coverage varies by manufacturer and product line.
How much does a roofing square cost installed?+
Installed cost per roofing square ranges widely: 3-tab asphalt shingles cost $350–$550/square, architectural shingles cost $450–$700/square, metal panels cost $700–$1,800/square, and tile costs $900–$1,600/square installed. Pricing includes materials, labor, underlayment, and basic flashing. Tear-off of old shingles adds $100–$150 per square.
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Back to the calculator ↑Roofing Squares Calculator is built and maintained by the RealCostIQ editorial team. Cost ranges and rates are checked against published industry data and contractor quotes, and revised when the underlying figures move. Read our data methodology or more about who builds this. Every calculation runs in your browser — no account, and none of your inputs are stored.
Cost ranges and rates here are checked against contractor quotes and published industry data. If a number still looks off, email Support@RealCostIQ.com and we'll review and fix it.