Roof Cost Calculator
Estimate the total cost of a new roof based on roof size, material, labor, and waste factor.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Roof Cost Calculator
- Enter Roof Area (sq ft) – Input the total square footage of your roof. Use imperial units (square feet).
- Enter Material Cost per sq ft ($) – Provide the cost of roofing materials per square foot (e.g., 3.50).
- Enter Labor Cost per sq ft ($) – Provide the labor cost per square foot (e.g., 2.00).
- Enter Waste Factor (%) – Set a percentage for material waste (default is 10%). Must be between 0 and 100.
- Click "Calculate Cost" – The calculator will show the total estimated cost and a breakdown of materials, labor, and waste.
Note: All inputs must be positive numbers. The result updates only after clicking the button. If you change any input, the result will hide until you recalculate.
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Frequently Asked Questions
The total cost is the sum of material cost (area × material cost per sq ft), labor cost (area × labor cost per sq ft), and waste cost (waste percentage of material and labor sum).
A typical waste factor ranges from 10% to 15% to account for cuts, overlaps, and mistakes.
Yes, as long as you input the correct area and costs per square foot, it works for any roof type.