Event Venue Capacity Calculator
ANA›Life Services Authority›National Calculator Authority›Event Venue Capacity 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; } }
Event Venue Capacity Calculator
Estimate the maximum guest capacity of an event venue based on total floor area and the chosen seating or standing arrangement style.
Total Usable Floor Area (sq ft)
Event Layout / Arrangement Style
Standing / Cocktail Reception (6 sq ft/person) Theater / Auditorium Style (8 sq ft/person) Classroom / Conference Style (15 sq ft/person) Banquet / Round Tables (12 sq ft/person) Boardroom / U-Shape (25 sq ft/person) Custom (enter sq ft per person)
Custom Space per Person (sq ft)
Circulation & Service Space (%)
Percentage of floor area reserved for aisles, stage, bar, buffet, etc.
Local Fire Code Maximum Capacity (optional)
If provided, the result will be capped at this legal limit.
Calculate Capacity
(function() { var layoutSelect = document.getElementById('eve-layout'); var customGroup = document.getElementById('eve-custom-group');
layoutSelect.addEventListener('change', function() { customGroup.style.display = (this.value === 'custom') ? 'block' : 'none'; });
var LAYOUT_SQFT = { standing : 6, theater : 8, classroom : 15, banquet : 12, boardroom : 25 };
var LAYOUT_LABELS = { standing : 'Standing / Cocktail Reception', theater : 'Theater / Auditorium Style', classroom : 'Classroom / Conference Style', banquet : 'Banquet / Round Tables', boardroom : 'Boardroom / U-Shape', custom : 'Custom' };
window.eveCalc = function() { var resultDiv = document.getElementById('eve-result'); resultDiv.style.display = 'block'; resultDiv.className = 'calc-result';
/ --- Read inputs --- / var floorArea = parseFloat(document.getElementById('eve-floor-area').value); var layout = document.getElementById('eve-layout').value; var circulation = parseFloat(document.getElementById('eve-circulation').value); var fireCode = document.getElementById('eve-fire-code').value; var customSqft = parseFloat(document.getElementById('eve-custom-sqft').value);
/ --- Validation --- / if (isNaN(floorArea) || floorArea 60) { resultDiv.className += ' calc-error'; resultDiv.innerHTML = '⚠ Circulation percentage must be between 0% and 60%.'; return; } if (layout === 'custom') { if (isNaN(customSqft) || customSqft 0 sq ft).'; return; } }
var sqftPerPerson = (layout === 'custom') ? customSqft : LAYOUT_SQFT[layout]; var fireCapacity = (fireCode !== '' && !isNaN(parseFloat(fireCode))) ? Math.floor(parseFloat(fireCode)) : null;
/ --- Core Formula --- Net Usable Area = Total Floor Area × (1 − Circulation% / 100) Raw Capacity = floor( Net Usable Area / sqft_per_person ) Final Capacity = min(Raw Capacity, Fire Code Limit) [if fire code provided] / var netArea = floorArea * (1 - circulation / 100); var rawCapacity = Math.floor(netArea / sqftPerPerson); var finalCapacity = rawCapacity; var fireCapped = false;
if (fireCapacity !== null && rawCapacity > fireCapacity) { finalCapacity = fireCapacity; fireCapped = true; }
if (finalCapacity ';
var rows = [ ['Total Floor Area', floorArea.toLocaleString() + ' sq ft'], ['Layout Style', LAYOUT_LABELS[layout]], ['Space per Person', sqftPerPerson + ' sq ft/person'], ['Circulation & Service', circulation + '% (' + (floorArea * circulation / 100).toFixed(0) + ' sq ft reserved)'], ['Net Usable Area', netArea.toFixed(1) + ' sq ft'], ['Density Classification', densityLabel], ['Calculated Raw Capacity', rawCapacity.toLocaleString() + ' persons'], ];
if (fireCapacity !== null) { rows.push(['Fire Code Limit', fireCapacity.toLocaleString() + ' persons']); }
rows.forEach(function(r, i) { var bg = (i % 2 === 0) ? '#f9f9f9' : '#ffffff'; html += '' + '' + r[0] + '' + '' + r[1] + '' + ''; });
html += '';
/ Highlighted final answer / html += ''; html += 'Maximum Recommended Capacity: ' + finalCapacity.toLocaleString() + ' persons'; if (fireCapped) { html += '⚠ Capped by local fire code limit of ' + fireCapacity.toLocaleString() + ' persons.'; } html += '';
/ Practical tips / html += ''; html += 'Practical Tips:'; html += ''; html += ''; html += ''; html += ''; html += '';
resultDiv.innerHTML = html; }; })();
#### Formula
Net Usable Area (sq ft) = Total Floor Area × (1 − Circulation% ÷ 100) Raw Capacity (persons) = ⌊ Net Usable Area ÷ Space per Person (sq ft/person) ⌋ Final Capacity = min(Raw Capacity, Fire Code Limit) [if fire code is provided] Space-per-person benchmarks: Standing/Cocktail = 6 sq ft • Theater = 8 sq ft • Banquet = 12 sq ft • Classroom = 15 sq ft • Boardroom/U-Shape = 25 sq ft
#### Assumptions & References
- Space-per-person benchmarks are derived from the International Building Code (IBC) Table 1004.5 and industry-standard event planning guidelines.
- The circulation allowance (default 20%) accounts for aisles, emergency egress paths, service areas, stages, bars, and buffet tables — adjust based on your specific floor plan.
- The IBC mandates a minimum of 5 sq ft per person for standing/concentrated use and 15 sq ft per person for business/conference use as legal minimums.
- Calculations assume a rectangular, unobstructed floor plan. Deduct area for fixed pillars, stages, permanent bars, or irregular geometry before entering the usable floor area.
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