Multiple Interest Rate Loan Calculator

.calc-container {
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Roof Replacement Cost Calculator

Flat/Low Slope (0/12 – 3/12)
Medium Slope (4/12 – 8/12)
Steep Slope (9/12 – 12/12)
Very Steep (12/12+)

Asphalt Shingles (Standard) – $4.50/sq ft
Architectural Shingles – $7.00/sq ft
Metal Seam – $12.00/sq ft
Clay/Concrete Tile – $18.00/sq ft
Natural Slate – $25.00/sq ft

How to Estimate Your Roof Replacement Cost

Replacing a roof is one of the most significant investments a homeowner can make. Understanding the factors that drive the total cost can help you budget effectively and evaluate contractor quotes with confidence. Our specific Roof Replacement Cost Calculator takes into account not just the size of your home, but the geometry of your roof and the materials you choose.

1. Calculating Roof Area vs. Floor Area

One common mistake homeowners make is assuming the square footage of their roof equals the square footage of their home’s floor plan. In reality, the roof pitch (steepness) significantly increases the surface area.

• Low Slope: Adds roughly 5-10% to your base footprint.
• Medium Slope: Adds about 20-25%.
• Steep Slope: Can increase surface area by 40% or more.

Additionally, professional roofers always factor in a waste margin (usually 10-15%) to account for cutting shingles to fit valleys, hips, and ridges.

2. Material Costs

The material you select is the largest variable in your total project cost:

• Asphalt Shingles: The most common and affordable option, typically ranging from $4.50 to $7.00 per square foot installed.
• Metal Roofing: Offers longevity and durability but comes at a higher premium, often costing $10.00 to $14.00 per square foot.
• Tile & Slate: Premium materials that can last over 50 years but require structural reinforcement and cost $18.00+ per square foot.

3. The “Tear-Off” Factor

If your existing roof is damaged or if you already have multiple layers of shingles, a “tear-off” is required. This labor-intensive process involves stripping the old material down to the deck. While some local codes allow laying new shingles over old ones, a complete tear-off allows contractors to inspect the underlying wood decking for rot or water damage, ensuring a longer-lasting installation.

Note: This calculator provides a national average estimate. Local labor rates, permit fees, and disposal costs can vary significantly by region. Always get 3-4 detailed quotes from licensed local contractors.

function calculateRoofCost() {
// 1. Get Input Values
var floorArea = document.getElementById(“floorArea”).value;
var pitchMulti = document.getElementById(“roofPitch”).value;
var materialCostPerSqFt = document.getElementById(“roofMaterial”).value;
var includeTearOff = document.getElementById(“tearOff”).checked;
// 2. Validate Inputs
if (floorArea === “” || isNaN(floorArea) || parseFloat(floorArea) <= 0) {
alert("Please enter a valid floor area in square feet.");
return;
}
// 3. Perform Calculations
var baseArea = parseFloat(floorArea);
var multiplier = parseFloat(pitchMulti);
var matCost = parseFloat(materialCostPerSqFt);
// Calculate Actual Roof Surface Area
var roofSurfaceArea = baseArea * multiplier;
// Add 10% Waste Factor (Standard in roofing)
var totalAreaWithWaste = roofSurfaceArea * 1.10;
// Calculate Material & Install Cost
var totalMaterialCost = totalAreaWithWaste * matCost;
// Calculate Tear Off Cost ($2.00 per sq ft approx standard)
var tearOffCost = 0;
if (includeTearOff) {
tearOffCost = totalAreaWithWaste * 2.00;
}
var totalProjectCost = totalMaterialCost + tearOffCost;
// 4. Update UI
// Format numbers to currency/fixed decimals
document.getElementById("displayArea").innerHTML = Math.round(totalAreaWithWaste).toLocaleString() + " sq ft";
document.getElementById("displayMaterial").innerHTML = "$" + totalMaterialCost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
if (includeTearOff) {
document.getElementById("tearOffRow").style.display = "flex";
document.getElementById("displayTearOff").innerHTML = "$" + tearOffCost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
} else {
document.getElementById("tearOffRow").style.display = "none";
}
document.getElementById("displayTotal").innerHTML = "$" + totalProjectCost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Show result box
document.getElementById("resultBox").style.display = "block";
}