Siding Panel Count Calculator
ANA›Life Services Authority›National Calculator Authority›Siding Panel Count Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Siding Panel Count Calculator
Calculate the number of siding panels needed for your project, accounting for openings and waste.
### Wall Dimensions
Total Wall Width (ft)
Wall Height (ft)
Number of Walls
### Openings (Doors & Windows)
Number of Windows
Avg Window Width (ft)
Avg Window Height (ft)
Number of Doors
Avg Door Width (ft)
Avg Door Height (ft)
### Panel Specifications
Panel Width (in)
Panel Height (in)
Panel Overlap / Exposure (in)
Waste Factor (%)
Calculate
function sidCalc() { var resultDiv = document.getElementById('sid_result');
// --- Gather inputs --- var wallWidth = parseFloat(document.getElementById('sid_wall_width').value); var wallHeight = parseFloat(document.getElementById('sid_wall_height').value); var numWalls = parseInt(document.getElementById('sid_num_walls').value);
var numWindows = parseInt(document.getElementById('sid_num_windows').value) || 0; var winW = parseFloat(document.getElementById('sid_window_width').value) || 0; var winH = parseFloat(document.getElementById('sid_window_height').value) || 0;
var numDoors = parseInt(document.getElementById('sid_num_doors').value) || 0; var doorW = parseFloat(document.getElementById('sid_door_width').value) || 0; var doorH = parseFloat(document.getElementById('sid_door_height').value) || 0;
var panelWidthIn = parseFloat(document.getElementById('sid_panel_width').value); var panelHeightIn = parseFloat(document.getElementById('sid_panel_height').value); var overlapIn = parseFloat(document.getElementById('sid_overlap').value) || 0; var wastePct = parseFloat(document.getElementById('sid_waste').value);
// --- Validation --- var errors = []; if (isNaN(wallWidth) || wallWidth 0."); if (isNaN(wallHeight) || wallHeight 0."); if (isNaN(numWalls) || numWalls = 1."); if (isNaN(panelWidthIn) || panelWidthIn 0."); if (isNaN(panelHeightIn) || panelHeightIn 0."); if (overlapIn >= panelWidthIn) errors.push("Overlap must be less than panel width."); if (isNaN(wastePct) || wastePct 50) errors.push("Waste factor must be between 0 and 50%.");
if (errors.length > 0) { resultDiv.innerHTML = '' + errors.map(function(e){ return ''; }).join('') + ''; return; }
// --- Core calculations --- // Convert panel dimensions to feet var panelWidthFt = panelWidthIn / 12; var panelHeightFt = panelHeightIn / 12; var overlapFt = overlapIn / 12;
// Effective (exposed) panel width after overlap var effectiveWidthFt = panelWidthFt - overlapFt;
// Gross wall area (all walls assumed same size) var grossWallArea = wallWidth * wallHeight * numWalls; // sq ft
// Opening deductions var windowArea = numWindows * winW * winH; var doorArea = numDoors * doorW * doorH; var totalOpeningArea = windowArea + doorArea;
// Net wall area var netWallArea = grossWallArea - totalOpeningArea; if (netWallArea Opening area equals or exceeds total wall area. Please check your inputs.'; return; }
// Panel face area (using effective width for horizontal coverage) var panelFaceArea = effectiveWidthFt * panelHeightFt; // sq ft per panel
// Panels needed before waste var panelsBase = netWallArea / panelFaceArea;
// Apply waste factor var wasteMult = 1 + (wastePct / 100); var panelsTotal = panelsBase * wasteMult;
// Round up to whole panels var panelsFinal = Math.ceil(panelsTotal);
// Coverage per panel (sq ft) var coveragePerPanel = panelFaceArea.toFixed(2);
// --- Display results --- resultDiv.innerHTML = '### Results ' + '' + 'Gross Wall Area' + grossWallArea.toFixed(2) + ' sq ft' + 'Total Opening Area' + totalOpeningArea.toFixed(2) + ' sq ft' + 'Net Wall Area' + netWallArea.toFixed(2) + ' sq ft' + 'Effective Panel Coverage' + coveragePerPanel + ' sq ft/panel' + 'Panels Before Waste' + Math.ceil(panelsBase) + ' panels' + 'Waste Factor' + wastePct + '%' + 'Total Panels Required' + panelsFinal + ' panels' + ''; }
#### Formulas Used
Gross Wall Area = Wall Width × Wall Height × Number of Walls
Opening Area = (Number of Windows × Window W × Window H) + (Number of Doors × Door W × Door H)
Net Wall Area = Gross Wall Area − Opening Area
Effective Panel Width = Panel Width − Overlap
Panel Face Area = Effective Panel Width × Panel Height
Base Panels = Net Wall Area ÷ Panel Face Area
Total Panels = ⌈ Base Panels × (1 + Waste% ÷ 100) ⌉
#### Assumptions & References
- A waste factor of 10% is standard for straight runs; increase to 15–20% for diagonal or complex patterns.
- Opening deductions follow the National Siding Contractors Association guideline of subtracting 100% of opening area for openings larger than 10 sq ft.
- Results are always rounded up to the nearest whole panel to avoid shortages.
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