Concrete Coating Coverage and Cost Calculator
ANA›Life Services Authority›National Calculator Authority›Concrete Coating Coverage and Cost 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; } }
Concrete Coating Coverage and Cost Calculator
Estimate the amount of concrete coating (paint, epoxy, sealer, or stain) required and the total material cost for your project based on surface area, product spread rate, number of coats, and price per unit.
Surface Length (ft)
Surface Width (ft)
Spread Rate (sq ft per gallon)
Check product label — typical range: 200–400 sq ft/gal
Number of Coats
Waste / Overage Factor (%)
Recommended: 10% for smooth surfaces, 15–20% for textured
Price per Gallon ($)
Calculate
function conCalc() { var resultDiv = document.getElementById('con-result');
var length = parseFloat(document.getElementById('con-length').value); var width = parseFloat(document.getElementById('con-width').value); var spread = parseFloat(document.getElementById('con-spread').value); var coats = parseFloat(document.getElementById('con-coats').value); var waste = parseFloat(document.getElementById('con-waste').value); var price = parseFloat(document.getElementById('con-price').value);
// --- Validation --- var errors = []; if (isNaN(length) || length 10 || coats !== Math.floor(coats)) errors.push("Number of Coats must be a whole number between 1 and 10."); if (isNaN(waste) || waste 50) errors.push("Waste Factor must be between 0% and 50%."); if (isNaN(price) || price 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }
// --- Core Formulas --- // 1. Total surface area var area = length * width; // sq ft
// 2. Net gallons needed (before waste) // gallons_net = (area × coats) / spread_rate var gallonsNet = (area * coats) / spread;
// 3. Gallons with waste factor // gallons_total = gallons_net × (1 + waste% / 100) var gallonsTotal = gallonsNet * (1 + waste / 100);
// 4. Round up to whole gallons to purchase var gallonsToBuy = Math.ceil(gallonsTotal);
// 5. Total cost // cost = gallons_to_buy × price_per_gallon var totalCost = gallonsToBuy * price;
// 6. Cost per sq ft var costPerSqFt = totalCost / area;
// --- Output --- resultDiv.style.display = 'block'; resultDiv.innerHTML = '### Results ' + '' + 'Surface Area' + area.toFixed(1) + ' sq ft' + 'Net Gallons Needed (no waste)' + gallonsNet.toFixed(2) + ' gal' + 'Gallons with ' + waste + '% Waste Factor' + gallonsTotal.toFixed(2) + ' gal' + 'Gallons to Purchase (rounded up)' + gallonsToBuy + ' gal' + 'Total Material Cost$' + totalCost.toFixed(2) + '' + 'Cost per Sq Ft$' + costPerSqFt.toFixed(3) + ' / sq ft' + ''; }
#### Formulas Used
1. Surface Area Area (sq ft) = Length × Width
2. Net Gallons Required Gallonsnet = (Area × Number of Coats) ÷ Spread Rate
3. Gallons with Waste Factor Gallonstotal = Gallonsnet × (1 + Waste% ÷ 100)
4. Gallons to Purchase Gallonsbuy = ⌈ Gallonstotal ⌉ (ceiling — always round up)
5. Total Cost Cost ($) = Gallonsbuy × Price per Gallon
6. Cost per Square Foot Cost/sq ft = Total Cost ÷ Area
#### Assumptions & References
- Gallons are always rounded up to the nearest whole gallon to ensure full coverage — partial gallons are not typically sold.
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