Emergency Shelter Capacity Calculator
ANA›Life Services Authority›National Calculator Authority›Emergency Shelter 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; } }
Emergency Shelter Capacity Calculator
Calculate the maximum number of occupants an emergency shelter can safely accommodate based on floor area, sleeping arrangement type, and applicable safety standards (SPHERE/FEMA guidelines).
Total Usable Floor Area (m²)
Sleeping Arrangement
Floor Mats / Ground Sleeping Cots / Single Beds Bunk Beds (Double) Family Partitioned Units
Safety Standard
SPHERE Standard (3.5 m² per person) FEMA Standard (2.8 m² per person) Minimum Emergency (2.0 m² per person)
Common Area Percentage (%) corridors, bathrooms, kitchen
Number of Emergency Exits
Max Persons Per Exit (fire code)
Calculate Capacity
function emeCalc() { // --- Gather inputs --- var floorArea = parseFloat(document.getElementById('eme-floor-area').value); var sleepingType = document.getElementById('eme-sleeping-type').value; var standard = document.getElementById('eme-standard').value; var commonPct = parseFloat(document.getElementById('eme-common-area').value); var numExits = parseInt(document.getElementById('eme-num-exits').value); var exitCap = parseInt(document.getElementById('eme-exit-capacity').value);
var resultDiv = document.getElementById('eme-result'); resultDiv.style.display = 'block';
// --- Validation --- var errors = []; if (isNaN(floorArea) || floorArea 60) errors.push("Common area percentage must be between 0% and 60%."); if (isNaN(numExits) || numExits 0) { resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }
// --- Space standard (m² per person) --- var spacePerPerson; var standardLabel; if (standard === 'sphere') { spacePerPerson = 3.5; standardLabel = 'SPHERE (3.5 m²/person)'; } else if (standard === 'fema') { spacePerPerson = 2.8; standardLabel = 'FEMA (2.8 m²/person)'; } else { spacePerPerson = 2.0; standardLabel = 'Minimum Emergency (2.0 m²/person)'; }
// --- Sleeping arrangement density multiplier --- // Bunk beds effectively double usable sleeping density; // family units require more space per group. var sleepingMultiplier; var sleepingLabel; if (sleepingType === 'floor') { sleepingMultiplier = 1.0; sleepingLabel = 'Floor Mats (×1.0)'; } else if (sleepingType === 'cot') { sleepingMultiplier = 0.9; // cots need slightly more clearance sleepingLabel = 'Cots / Single Beds (×0.9)'; } else if (sleepingType === 'bunk') { sleepingMultiplier = 1.8; // bunk beds nearly double capacity sleepingLabel = 'Bunk Beds (×1.8)'; } else { sleepingMultiplier = 0.75; // family partitions use more space per person sleepingLabel = 'Family Partitioned Units (×0.75)'; }
// --- Step 1: Net sleeping area --- // Net sleeping area = Total floor area × (1 - common area fraction) var commonFraction = commonPct / 100; var netSleepingArea = floorArea * (1 - commonFraction);
// --- Step 2: Space-based capacity --- // Capacity_space = floor( netSleepingArea / spacePerPerson × sleepingMultiplier ) var capacitySpace = Math.floor((netSleepingArea / spacePerPerson) * sleepingMultiplier);
// --- Step 3: Exit-based capacity (fire/egress limit) --- // Capacity_exit = numExits × exitCap var capacityExit = numExits * exitCap;
// --- Step 4: Final capacity = min of both constraints --- var finalCapacity = Math.min(capacitySpace, capacityExit);
// Ensure non-negative if (finalCapacity '; html += 'Total Floor Area' + floorArea.toFixed(1) + ' m²'; html += 'Common Area Deduction (' + commonPct + '%)−' + (floorArea * commonFraction).toFixed(1) + ' m²'; html += 'Net Sleeping Area' + netSleepingArea.toFixed(1) + ' m²'; html += 'Space Standard Applied' + standardLabel + ''; html += 'Sleeping Arrangement Multiplier' + sleepingLabel + ''; html += 'Space-Based Capacity' + capacitySpace + ' persons'; html += 'Exit-Based Capacity (' + numExits + ' exits × ' + exitCap + ')' + capacityExit + ' persons'; html += '✅ Maximum Safe Capacity' + finalCapacity + ' persons'; html += 'Limiting Factor' + limitingFactor + ''; html += '';
html += '#### Support Requirements (SPHERE) '; html += ''; html += 'Toilets / Latrines Needed (1 per 20 persons)' + toiletsNeeded + ' units'; html += 'Minimum Water Supply' + waterLitersPerDay.toLocaleString() + ' L/day'; html += '';
resultDiv.innerHTML = html; }
#### Formulas Used
Net Sleeping Area: Net Area (m²) = Total Floor Area × (1 − Common Area %)
Space-Based Capacity: Cspace = ⌊ (Net Area ÷ Space Standard) × Sleeping Multiplier ⌋
Exit-Based Capacity (Egress): Cexit = Number of Exits × Max Persons Per Exit
Final Safe Capacity: Cfinal = min(Cspace, Cexit)
Sleeping Multipliers: Floor Mats = 1.0 | Cots = 0.9 | Bunk Beds = 1.8 | Family Units = 0.75
Sanitation (SPHERE): 1 toilet per 20 persons Water (SPHERE): 15 L per person per day
#### Assumptions & References
- SPHERE Handbook (2018): Minimum 3.5 m² covered floor area per person in collective shelters; 1 toilet per 20 persons; 15 L water/person/day.
- FEMA P-361 / IS-120: 2.8 m² (30 sq ft) per person as a working standard for mass care shelters in the United States.
- Minimum Emergency Standard: 2.0 m² per person — used only in acute crisis phases; not recommended for stays exceeding 72 hours.
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