Estimated Shingle Roof Materials & Costs
Total Sloped Roof Area: sq ft
Total Roofing Squares: squares
Shingle Bundles Needed: bundles
Estimated Shingle Cost:
Underlayment Rolls Needed: rolls
Estimated Underlayment Cost:
Starter Shingle Bundles Needed: bundles
Estimated Starter Shingle Cost:
Ridge Cap Bundles Needed: bundles
Estimated Ridge Cap Cost:
Roofing Nails Needed: lbs
Estimated Nail Cost:
Total Estimated Material Cost:
function calculateShingleRoof() {
// Get input values
var roofLength = parseFloat(document.getElementById('roofLength').value);
var roofWidth = parseFloat(document.getElementById('roofWidth').value);
var pitchRise = parseFloat(document.getElementById('pitchRise').value);
var pitchRun = parseFloat(document.getElementById('pitchRun').value);
var wasteFactor = parseFloat(document.getElementById('wasteFactor').value);
var shinglesPerSquare = parseFloat(document.getElementById('shinglesPerSquare').value);
var costPerShingleBundle = parseFloat(document.getElementById('costPerShingleBundle').value);
var underlaymentCoverage = parseFloat(document.getElementById('underlaymentCoverage').value);
var costPerUnderlaymentRoll = parseFloat(document.getElementById('costPerUnderlaymentRoll').value);
var eaveLength = parseFloat(document.getElementById('eaveLength').value);
var starterShingleCoverage = parseFloat(document.getElementById('starterShingleCoverage').value);
var costPerStarterBundle = parseFloat(document.getElementById('costPerStarterBundle').value);
var ridgeHipLength = parseFloat(document.getElementById('ridgeHipLength').value);
var ridgeCapCoverage = parseFloat(document.getElementById('ridgeCapCoverage').value);
var costPerRidgeCapBundle = parseFloat(document.getElementById('costPerRidgeCapBundle').value);
var nailsPerSquare = parseFloat(document.getElementById('nailsPerSquare').value);
var costPerLbNails = parseFloat(document.getElementById('costPerLbNails').value);
// Validate inputs
if (isNaN(roofLength) || roofLength <= 0 ||
isNaN(roofWidth) || roofWidth <= 0 ||
isNaN(pitchRise) || pitchRise < 0 ||
isNaN(pitchRun) || pitchRun <= 0 ||
isNaN(wasteFactor) || wasteFactor < 0 ||
isNaN(shinglesPerSquare) || shinglesPerSquare <= 0 ||
isNaN(costPerShingleBundle) || costPerShingleBundle < 0 ||
isNaN(underlaymentCoverage) || underlaymentCoverage <= 0 ||
isNaN(costPerUnderlaymentRoll) || costPerUnderlaymentRoll < 0 ||
isNaN(eaveLength) || eaveLength < 0 ||
isNaN(starterShingleCoverage) || starterShingleCoverage <= 0 ||
isNaN(costPerStarterBundle) || costPerStarterBundle < 0 ||
isNaN(ridgeHipLength) || ridgeHipLength < 0 ||
isNaN(ridgeCapCoverage) || ridgeCapCoverage <= 0 ||
isNaN(costPerRidgeCapBundle) || costPerRidgeCapBundle < 0 ||
isNaN(nailsPerSquare) || nailsPerSquare < 0 ||
isNaN(costPerLbNails) || costPerLbNails < 0) {
alert("Please enter valid positive numbers for all fields.");
document.getElementById('shingleRoofResult').style.display = 'none';
return;
}
// Calculations
var flatArea = roofLength * roofWidth;
var pitchMultiplier = Math.sqrt((pitchRise * pitchRise) + (pitchRun * pitchRun)) / pitchRun;
var slopedArea = flatArea * pitchMultiplier;
var totalSquares = slopedArea / 100;
// Shingles
var shingleBundlesNeeded = Math.ceil(totalSquares * shinglesPerSquare * (1 + wasteFactor / 100));
var totalShingleCost = shingleBundlesNeeded * costPerShingleBundle;
// Underlayment
var underlaymentRollsNeeded = Math.ceil(slopedArea / underlaymentCoverage);
var totalUnderlaymentCost = underlaymentRollsNeeded * costPerUnderlaymentRoll;
// Starter Shingles
var starterBundlesNeeded = Math.ceil(eaveLength / starterShingleCoverage);
var totalStarterCost = starterBundlesNeeded * costPerStarterBundle;
// Ridge Cap Shingles
var ridgeCapBundlesNeeded = Math.ceil(ridgeHipLength / ridgeCapCoverage);
var totalRidgeCapCost = ridgeCapBundlesNeeded * costPerRidgeCapBundle;
// Nails
var nailsNeededLbs = Math.ceil(totalSquares * nailsPerSquare);
var totalNailCost = nailsNeededLbs * costPerLbNails;
// Total Material Cost
var totalMaterialCost = totalShingleCost + totalUnderlaymentCost + totalStarterCost + totalRidgeCapCost + totalNailCost;
// Display results
document.getElementById('displaySlopedArea').innerText = slopedArea.toFixed(2);
document.getElementById('displayTotalSquares').innerText = totalSquares.toFixed(2);
document.getElementById('displayShingleBundles').innerText = shingleBundlesNeeded;
document.getElementById('displayShingleCost').innerText = '$' + totalShingleCost.toFixed(2);
document.getElementById('displayUnderlaymentRolls').innerText = underlaymentRollsNeeded;
document.getElementById('displayUnderlaymentCost').innerText = '$' + totalUnderlaymentCost.toFixed(2);
document.getElementById('displayStarterBundles').innerText = starterBundlesNeeded;
document.getElementById('displayStarterCost').innerText = '$' + totalStarterCost.toFixed(2);
document.getElementById('displayRidgeCapBundles').innerText = ridgeCapBundlesNeeded;
document.getElementById('displayRidgeCapCost').innerText = '$' + totalRidgeCapCost.toFixed(2);
document.getElementById('displayNailsNeeded').innerText = nailsNeededLbs;
document.getElementById('displayNailCost').innerText = '$' + totalNailCost.toFixed(2);
document.getElementById('displayTotalMaterialCost').innerText = '$' + totalMaterialCost.toFixed(2);
document.getElementById('shingleRoofResult').style.display = 'block';
}
Understanding Your Shingle Roof Material Needs
Replacing or installing a new shingle roof is a significant home improvement project. Accurately estimating the materials required is crucial for budgeting and avoiding costly delays. Our Shingle Roof Material & Cost Calculator helps homeowners and contractors get a precise estimate of the shingles, underlayment, starter strips, ridge caps, and nails needed, along with their approximate costs.
How to Measure Your Roof for the Calculator
For the most accurate results, you'll need a few key measurements:
- Roof Length & Width: Measure the total length and width of your roof's footprint. For complex roofs, you might need to break it down into simpler rectangular sections and sum their areas.
- Roof Pitch (Rise/Run): This describes the steepness of your roof. It's expressed as a ratio, like "6/12," meaning the roof rises 6 inches vertically for every 12 inches it extends horizontally. You can often find this by measuring from inside your attic or by using a pitch gauge on the roof's edge.
- Waste Factor: Roofing projects always involve some material waste due to cutting, trimming, and mistakes. A typical waste factor is 10-15%, but it can be higher for complex roofs with many valleys, hips, and dormers.
- Total Eave Length: This is the total linear feet of all the eaves (the lower edges of the roof where water drains off). This measurement is essential for calculating starter shingle requirements.
- Total Ridge/Hip Length: This is the total linear feet of all ridges (the horizontal lines where two roof planes meet at the top) and hips (the angled lines where two roof planes meet at an outside corner). This is needed for ridge cap shingles.
Key Roofing Terms Explained
- Roofing Square: A standard unit of roofing material coverage, equal to 100 square feet. Shingles are typically sold in bundles, with 3 bundles usually making up one roofing square for standard 3-tab shingles. Architectural shingles might vary.
- Underlayment: A protective layer (often felt or synthetic material) installed directly onto the roof deck before shingles. It provides an extra barrier against water penetration.
- Starter Shingles: The first course of shingles installed along the eaves and rake edges. They provide a sealed edge and proper shingle offset.
- Ridge Cap Shingles: Specialized shingles used to cover the peaks (ridges) and angled corners (hips) of the roof, providing a watertight seal and a finished look.
- Roofing Nails: Specific nails designed for roofing, typically galvanized to resist corrosion. The quantity needed depends on local building codes and shingle manufacturer specifications.
How the Calculator Works
Our calculator first determines the total sloped surface area of your roof based on its length, width, and pitch. It then converts this area into "roofing squares." Using your specified waste factor and material coverage rates, it estimates the number of bundles or rolls needed for each component (shingles, underlayment, starter, ridge cap, and nails). Finally, it multiplies these quantities by your provided unit costs to give you a total estimated material cost.
Important Considerations
This calculator provides an estimate for materials only. It does not include labor costs, disposal fees, permits, or other accessories like drip edge, flashing, or ventilation. Always consult with a professional roofing contractor for a precise quote and to ensure compliance with local building codes.