Metal Roof Material Calculator
.metal-calc-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e1e1e1;
border-radius: 12px;
background-color: #ffffff;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.metal-calc-header {
text-align: center;
margin-bottom: 30px;
}
.metal-calc-header h2 {
color: #2c3e50;
margin-bottom: 10px;
}
.metal-calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
margin-bottom: 25px;
}
.metal-calc-field {
display: flex;
flex-direction: column;
}
.metal-calc-field label {
font-weight: 600;
margin-bottom: 8px;
color: #34495e;
font-size: 14px;
}
.metal-calc-field input, .metal-calc-field select {
padding: 12px;
border: 1px solid #ced4da;
border-radius: 6px;
font-size: 16px;
}
.metal-calc-button {
grid-column: span 2;
background-color: #27ae60;
color: white;
padding: 15px;
border: none;
border-radius: 6px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.2s;
}
.metal-calc-button:hover {
background-color: #219150;
}
.metal-calc-results {
margin-top: 30px;
padding: 20px;
background-color: #f8f9fa;
border-radius: 8px;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #dee2e6;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
color: #495057;
font-weight: 500;
}
.result-value {
font-weight: 700;
color: #2c3e50;
}
.article-section {
margin-top: 40px;
line-height: 1.6;
color: #333;
}
.article-section h3 {
color: #2c3e50;
border-left: 4px solid #27ae60;
padding-left: 15px;
margin-top: 25px;
}
@media (max-width: 600px) {
.metal-calc-grid {
grid-template-columns: 1fr;
}
.metal-calc-button {
grid-column: 1;
}
}
function calculateMetalRoof() {
var length = parseFloat(document.getElementById("roofLength").value);
var width = parseFloat(document.getElementById("roofWidth").value);
var pitchMult = parseFloat(document.getElementById("roofPitch").value);
var pWidthInch = parseFloat(document.getElementById("panelWidth").value);
var waste = parseFloat(document.getElementById("wasteFactor").value);
var sides = parseInt(document.getElementById("sides").value);
if (isNaN(length) || isNaN(width) || isNaN(pWidthInch) || length <= 0 || width <= 0) {
alert("Please enter valid positive dimensions for length and width.");
return;
}
// Calculate Surface Area
// Note: Width here is rafter length, so pitch is usually already accounted for if measured on the slope
// But if measuring footprint, pitchMult is vital. We apply it to ensure accuracy for slope calculations.
var baseArea = length * width * sides;
var totalArea = baseArea * (1 + (waste / 100));
// Panels calculation (based on horizontal length)
var pWidthFeet = pWidthInch / 12;
var panelsPerSide = Math.ceil(length / pWidthFeet);
var totalPanels = panelsPerSide * sides;
// Linear Feet
var linearFeet = totalPanels * width;
// Squares
var squares = totalArea / 100;
// Screws (approx 85 per square)
var screws = Math.ceil(squares * 85);
// Display results
document.getElementById("resArea").innerText = totalArea.toFixed(2) + " sq ft";
document.getElementById("resSquares").innerText = squares.toFixed(2);
document.getElementById("resPanels").innerText = totalPanels + " panels";
document.getElementById("resLinear").innerText = linearFeet.toFixed(2) + " ft";
document.getElementById("resScrews").innerText = screws + " (approx)";
document.getElementById("metalResults").style.display = "block";
// Smooth scroll to results
document.getElementById("metalResults").scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}