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Estimate your roof area, material quantities, and costs based on dimensions and pitch.
Material estimates are approximate. Actual quantities may vary due to waste, site conditions, design changes, material dimensions, labor methods and local pricing. Always verify with a qualified contractor or supplier before purchasing materials.
Roof Area = Length × Width × Pitch Factor. Pitch Factor = √(1 + (rise/12)²). Includes waste percentage.
Result: Total area: 1,291 sq ft, Cost: $4,518.50
Measure the vertical rise over 12 inches of horizontal run. A 6/12 pitch means 6 inches rise per foot.
A 10-15% waste factor is standard to account for cuts, overlaps, and mistakes.
No, this estimates material quantities and costs only. Labor varies by region and contractor.
A roofing square is 100 square feet. Divide your total roof area by 100 to get the number of squares needed. Most single-family homes need 20-35 squares depending on their footprint and roof complexity.
Yes, always replace the underlayment when re-roofing. The underlayment provides a secondary waterproof barrier that protects the roof deck from moisture if shingles are damaged or blown off.
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