Home Square Footage Treatment Coverage Calculator
ANA›Life Services Authority›National Calculator Authority›Home Square Footage Treatment Coverage 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; } }
Home Square Footage Treatment Coverage Calculator
Determine how much treatment product (paint, sealant, pesticide, fertilizer, etc.) you need based on your home's square footage and the product's coverage rate.
Room / Area Length (feet)
Room / Area Width (feet)
Additional Square Footage (optional, e.g. irregular areas)
Product Coverage Rate (sq ft per unit)
Check your product label. Example: 1 gallon of paint covers ~400 sq ft.
Number of Coats / Applications
Waste / Overage Buffer (%)
Industry standard is 10–15% for waste and touch-ups.
Unit Label (optional, e.g. gallons, bags, bottles)
Calculate
function homCalc() { var resultDiv = document.getElementById('hom-result'); resultDiv.style.display = 'block'; resultDiv.className = 'calc-result';
var length = parseFloat(document.getElementById('hom-length').value); var width = parseFloat(document.getElementById('hom-width').value); var extraSqft = parseFloat(document.getElementById('hom-extra-sqft').value) || 0; var coverageRate = parseFloat(document.getElementById('hom-coverage-rate').value); var coats = parseInt(document.getElementById('hom-coats').value) || 1; var wastePct = parseFloat(document.getElementById('hom-waste').value) || 0; var unitLabel = document.getElementById('hom-unit-label').value.trim() || 'units';
// --- Validation --- if (isNaN(length) || length 100) { resultDiv.className += ' calc-result-error'; resultDiv.innerHTML = '⚠ Waste buffer must be between 0% and 100%.'; return; } if (extraSqft ' + 'Base Area (L × W + Extra)' + '' + baseSqft.toFixed(2) + ' sq ft' + 'Total Area (with ' + coats + ' coat' + (coats > 1 ? 's' : '') + ')' + '' + totalSqftNeeded.toFixed(2) + ' sq ft' + 'Raw ' + unitLabel + ' Needed' + '' + rawUnits.toFixed(3) + ' ' + unitLabel + '' + 'With ' + wastePct + '% Waste Buffer' + '' + unitsWithBuffer.toFixed(3) + ' ' + unitLabel + '' + '' + '✓ Units to Purchase (rounded up)' + '' + unitsCeiling + ' ' + unitLabel + '' + '' + '' + 'Each unit covers ' + sqftPerUnit.toLocaleString() + ' sq ft. ' + 'Purchasing ' + unitsCeiling + ' ' + unitLabel + ' will cover up to ' + (unitsCeiling * sqftPerUnit).toLocaleString() + ' sq ft ' + '(' + (unitsCeiling * sqftPerUnit - totalSqftNeeded).toFixed(1) + ' sq ft surplus after buffer).' + '
'; }
#### Formula
Base Area = (Length × Width) + Additional Sq Ft Total Area Needed = Base Area × Number of Coats Raw Units = Total Area Needed ÷ Coverage Rate (sq ft per unit) Units with Buffer = Raw Units × (1 + Waste% ÷ 100) Units to Purchase = ⌈ Units with Buffer ⌉ (ceiling / round up)
#### Assumptions & References
- Coverage rate is taken directly from the product label (e.g., 1 gallon of interior paint covers ~350–400 sq ft per coat per the Paint Quality Institute).
- Units are always rounded up (ceiling function) because partial units cannot typically be purchased.
- Reference: EPA guidelines recommend following label directions exactly for pesticide application rates (EPA Pesticide Labels).
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