Shingles Roofing Calculator

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Shingles Roofing Calculator

Enter Your Roof Dimensions and Costs

Estimated Roofing Cost

Understanding Your Shingles Roofing Estimate

Estimating the cost of a new shingles roof involves understanding your roof's size, the cost of materials, and accounting for potential waste. This calculator simplifies that process by breaking down the key components.

Roof Area Calculation

The first step is to determine the total surface area of your roof. For a simple rectangular roof, this is calculated by multiplying the roof's length by its width.

Roof Area (sq ft) = Roof Length (ft) * Roof Width (ft)

Note: This calculator assumes a simple rectangular roof for simplicity. Complex roof shapes (hip roofs, multiple dormers, etc.) may have a larger actual surface area. Professional measurements are always recommended for the most accurate quote.

Squares of Shingles

Roofing materials, including shingles, are typically sold by the "square." One roofing square is equal to 100 square feet (10 ft x 10 ft).

Number of Squares = Roof Area (sq ft) / 100

Accounting for Waste

When installing shingles, there will always be some material waste due to cutting, fitting around edges, and handling. A standard waste factor is usually between 10% and 15%. This calculator allows you to input your estimated waste factor.

Total Squares Needed = Number of Squares * (1 + Waste Factor / 100)

Calculating Total Material Cost

Once you know the total number of squares needed, including waste, you can estimate the material cost by multiplying it by the cost per square of the shingles you choose.

Estimated Shingle Material Cost = Total Squares Needed * Cost Per Square of Shingles ($)

Factors Not Included in This Calculator

This calculator provides an estimate for the cost of shingles material only. It does not include:

  • Labor costs for installation
  • Cost of underlayment, flashing, vents, or drip edges
  • Disposal fees for old roofing materials
  • Permit fees
  • Complexity of the roof design (e.g., steep pitch, number of valleys, dormers)
  • Potential need for roof deck repair or replacement

For an accurate and comprehensive quote, always consult with qualified roofing professionals.

function calculateRoofingCost() { var roofLength = parseFloat(document.getElementById("roofLength").value); var roofWidth = parseFloat(document.getElementById("roofWidth").value); var shingleCostPerSquare = parseFloat(document.getElementById("shingleCostPerSquare").value); var wasteFactor = parseFloat(document.getElementById("wasteFactor").value); var resultElement = document.getElementById("result"); resultElement.innerHTML = ""; // Clear previous results if (isNaN(roofLength) || roofLength <= 0) { resultElement.innerHTML = "Please enter a valid roof length."; return; } if (isNaN(roofWidth) || roofWidth <= 0) { resultElement.innerHTML = "Please enter a valid roof width."; return; } if (isNaN(shingleCostPerSquare) || shingleCostPerSquare < 0) { resultElement.innerHTML = "Please enter a valid cost per square of shingles."; return; } if (isNaN(wasteFactor) || wasteFactor < 0) { resultElement.innerHTML = "Please enter a valid waste factor (e.g., 10 for 10%)."; return; } var roofAreaSqFt = roofLength * roofWidth; var roofAreaSquares = roofAreaSqFt / 100; var totalSquaresNeeded = roofAreaSquares * (1 + wasteFactor / 100); var estimatedMaterialCost = totalSquaresNeeded * shingleCostPerSquare; resultElement.innerHTML = "Estimated Shingle Material Cost: $" + estimatedMaterialCost.toFixed(2) + ""; }

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