.shingles-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e0e0e0;
border-radius: 8px;
background-color: #fdfdfd;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.shingles-calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 25px;
font-size: 1.8em;
}
.shingles-calculator-container .input-group {
margin-bottom: 18px;
display: flex;
flex-direction: column;
}
.shingles-calculator-container label {
display: block;
margin-bottom: 8px;
font-weight: bold;
color: #555;
font-size: 0.95em;
}
.shingles-calculator-container input[type="number"] {
width: 100%;
padding: 12px;
border: 1px solid #ccc;
border-radius: 5px;
box-sizing: border-box;
font-size: 1em;
color: #333;
transition: border-color 0.3s ease;
}
.shingles-calculator-container input[type="number"]:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}
.shingles-calculator-container button {
width: 100%;
padding: 14px 20px;
background-color: #28a745;
color: white;
border: none;
border-radius: 5px;
font-size: 1.1em;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 20px;
}
.shingles-calculator-container button:hover {
background-color: #218838;
transform: translateY(-1px);
}
.shingles-calculator-container button:active {
transform: translateY(0);
}
.shingles-calculator-container .result-section {
margin-top: 30px;
padding: 20px;
border-top: 1px solid #eee;
background-color: #e9f7ef;
border-radius: 8px;
text-align: center;
}
.shingles-calculator-container .result-section h3 {
color: #28a745;
margin-bottom: 15px;
font-size: 1.5em;
}
.shingles-calculator-container .result-section p {
font-size: 1.1em;
color: #333;
margin-bottom: 10px;
}
.shingles-calculator-container .result-section p strong {
color: #007bff;
font-size: 1.2em;
}
.shingles-calculator-container .error-message {
color: #dc3545;
margin-top: 10px;
text-align: center;
font-weight: bold;
}
.shingles-calculator-container .pitch-input-group {
display: flex;
gap: 10px;
}
.shingles-calculator-container .pitch-input-group > div {
flex: 1;
}
function calculateShingles() {
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 shingleCoverage = parseFloat(document.getElementById('shingleCoverage').value);
var costPerBundle = parseFloat(document.getElementById('costPerBundle').value);
var resultDiv = document.getElementById('shingleResult');
var errorMessageDiv = document.getElementById('errorMessage');
// Reset error message and hide results
errorMessageDiv.style.display = 'none';
resultDiv.style.display = 'none';
// Input validation
if (isNaN(roofLength) || roofLength <= 0 ||
isNaN(roofWidth) || roofWidth <= 0 ||
isNaN(pitchRise) || pitchRise <= 0 ||
isNaN(pitchRun) || pitchRun <= 0 ||
isNaN(wasteFactor) || wasteFactor < 0 ||
isNaN(shingleCoverage) || shingleCoverage <= 0 ||
isNaN(costPerBundle) || costPerBundle < 0) {
errorMessageDiv.textContent = 'Please enter valid positive numbers for all fields.';
errorMessageDiv.style.display = 'block';
return;
}
// 1. Calculate Flat Roof Area (footprint)
var flatRoofArea = roofLength * roofWidth;
// 2. Calculate Pitch Factor
// Formula: sqrt((rise^2) + (run^2)) / run
var pitchFactor = Math.sqrt(Math.pow(pitchRise, 2) + Math.pow(pitchRun, 2)) / pitchRun;
// 3. Calculate Sloped Roof Area
var slopedRoofArea = flatRoofArea * pitchFactor;
// 4. Calculate Total Area Including Waste
var totalAreaIncludingWaste = slopedRoofArea * (1 + (wasteFactor / 100));
// 5. Calculate Number of Bundles Needed (round up)
var bundlesNeeded = Math.ceil(totalAreaIncludingWaste / shingleCoverage);
// 6. Calculate Total Estimated Material Cost
var totalCost = bundlesNeeded * costPerBundle;
// Display results
document.getElementById('flatRoofAreaResult').textContent = flatRoofArea.toFixed(2);
document.getElementById('slopedRoofAreaResult').textContent = slopedRoofArea.toFixed(2);
document.getElementById('totalAreaWasteResult').textContent = totalAreaIncludingWaste.toFixed(2);
document.getElementById('bundlesNeededResult').textContent = bundlesNeeded;
document.getElementById('totalCostResult').textContent = '$' + totalCost.toFixed(2);
resultDiv.style.display = 'block';
}
Shingle Estimate Calculator
Estimating the number of shingles needed for a roof project can be a complex task, but it's crucial for budgeting and avoiding material shortages or excess waste. This calculator simplifies the process by taking into account your roof's dimensions, pitch, and common industry factors like waste and shingle coverage.
Understanding your roof's area is the first step. Most roofs are measured in "squares," where one square equals 100 square feet. Shingles are typically sold in bundles, with three bundles usually making up one square, though this can vary by shingle type and manufacturer.
How to Use the Shingle Estimate Calculator:
- Roof Length (feet): Measure the total length of your roof along the eaves or ridge. For a simple rectangular roof, this is one side's length. For more complex roofs, you might need to break it down into sections and sum the lengths, or calculate the total footprint area.
- Roof Width (feet): Measure the total width of your roof from eave to eave, perpendicular to the length. This represents the base footprint width.
- Roof Pitch Rise (inches): This is the vertical rise of your roof for every 12 inches of horizontal run. For example, a "6/12 pitch" means the roof rises 6 inches for every 12 inches of horizontal distance. Enter only the "rise" number (e.g., 6).
- Roof Pitch Run (inches): This is almost always 12 inches for standard roof pitch measurements.
- Waste Factor (%): A percentage added to account for cuts, starter strips, hip and ridge caps, and potential errors. A typical waste factor is 10-15%, but for complex roofs (many valleys, hips, dormers), it can be higher (15-20%).
- Shingle Coverage per Bundle (sq ft): Check the packaging or manufacturer's specifications for your chosen shingles. Standard 3-tab shingles often cover 33.3 sq ft per bundle, while architectural shingles might vary.
- Cost per Shingle Bundle ($): Enter the average cost per bundle from your supplier for a total cost estimate.
Once you've entered these details, the calculator will provide an estimate of the total square footage, the number of bundles required, and the approximate material cost.
Calculate Your Shingle Needs
Your Shingle Estimate:
Estimated Flat Roof Area: sq ft
Estimated Sloped Roof Area: sq ft
Total Area Including Waste: sq ft
Number of Shingle Bundles Needed: bundles
Total Estimated Material Cost: