Canopy Clearance Calculator
ANA›Life Services Authority›National Calculator Authority›Canopy Clearance 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; } }
Canopy Clearance Calculator
Calculate the vertical clearance beneath a canopy, awning, or overhead structure based on its mounting height, slope, and horizontal projection.
Mounting Height at Wall (ft)
Vertical height from ground to the highest point where the canopy is attached.
Horizontal Projection / Depth (ft)
How far the canopy extends outward from the wall.
Canopy Slope (degrees, 0–45°)
Downward angle of the canopy from horizontal (0° = flat).
Canopy Structural Thickness (in)
Thickness of the canopy frame/structure at its lowest edge.
Calculate
function canCalc() { var resultDiv = document.getElementById('can-result');
var mountHeight = parseFloat(document.getElementById('can-mount-height').value); var projection = parseFloat(document.getElementById('can-projection').value); var slopeDeg = parseFloat(document.getElementById('can-slope').value); var thicknessIn = parseFloat(document.getElementById('can-thickness').value);
// --- Validation --- var errors = []; if (isNaN(mountHeight) || mountHeight 45) errors.push("Slope must be between 0° and 45°."); if (isNaN(thicknessIn) || thicknessIn 0) { resultDiv.style.display = 'block'; resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }
// --- Core Formula --- // Drop at outer edge due to slope: // vertical_drop = projection × tan(slope_radians) var slopeRad = slopeDeg * Math.PI / 180; var verticalDrop = projection * Math.tan(slopeRad);
// Height of canopy soffit (underside) at outer edge before thickness: // soffit_height_raw = mount_height − vertical_drop var soffitHeightRaw = mountHeight - verticalDrop;
// Subtract structural thickness (convert inches → feet): var thicknessFt = thicknessIn / 12; var clearance = soffitHeightRaw - thicknessFt;
// IBC / ADA minimum pedestrian clearance = 7 ft (84 in) var minClearance = 7.0; var compliant = clearance >= minClearance;
if (clearance ' + 'Vertical Drop at Outer Edge' + '' + verticalDrop.toFixed(3) + ' ft (' + (verticalDrop12).toFixed(2) + ' in)' + 'Soffit Height (before thickness)' + '' + soffitHeightRaw.toFixed(3) + ' ft' + 'Structural Thickness Deduction' + '' + thicknessIn.toFixed(2) + ' in (' + thicknessFt.toFixed(3) + ' ft)' + '' + 'Clear Height at Outer Edge' + '' + clearance.toFixed(3) + ' ft (' + clearanceIn.toFixed(2) + ' in)*' + '' + '' + statusText + '
'; }
#### Formula
Step 1 — Vertical drop at outer edge:
vertical_drop = projection × tan(slope°)
Step 2 — Soffit height at outer edge (before thickness):
soffit_height = mount_height − vertical_drop
Step 3 — Net clear height (clearance):
clearance = soffit_height − (thickness_in ÷ 12)
All distances in feet; slope converted to radians for trigonometry.
#### Assumptions & References
- IBC 2021 §1003.3 requires a minimum 80 in (6.67 ft) headroom in walking surfaces; many jurisdictions enforce 84 in (7 ft) for exterior canopies and awnings.
- ADA Standards §307.4 requires protruding objects to provide at least 80 in (6.67 ft) of vertical clearance.
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