Hardwood Floor Refinishing Coverage Calculator
ANA›Life Services Authority›National Calculator Authority›Hardwood Floor Refinishing 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; } }
Hardwood Floor Refinishing Coverage Calculator
Estimate the amount of stain, polyurethane finish, and sandpaper needed to refinish your hardwood floors based on room dimensions and product coverage rates.
Room Length (ft)
Room Width (ft)
Waste Factor (%)
Stain Coverage (sq ft / quart)
Polyurethane Finish Coverage (sq ft / quart)
Number of Finish Coats
Sandpaper Sheet Coverage (sq ft / sheet)
Sanding Passes
Calculate
function harCalc() { var length = parseFloat(document.getElementById('har-length').value); var width = parseFloat(document.getElementById('har-width').value); var waste = parseFloat(document.getElementById('har-waste').value); var stainCov = parseFloat(document.getElementById('har-stain-cov').value); var finishCov = parseFloat(document.getElementById('har-finish-cov').value); var finCoats = parseFloat(document.getElementById('har-finish-coats').value); var sandCov = parseFloat(document.getElementById('har-sand-cov').value); var sandPasses = parseFloat(document.getElementById('har-sand-passes').value);
var resultDiv = document.getElementById('har-result');
// --- Validation --- if (isNaN(length) || length Please enter a valid Room Length (must be > 0).'; return; } if (isNaN(width) || width Please enter a valid Room Width (must be > 0).'; return; } if (isNaN(waste) || waste 50) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Waste Factor must be between 0% and 50%.'; return; } if (isNaN(stainCov) || stainCov Stain Coverage must be > 0.'; return; } if (isNaN(finishCov) || finishCov Finish Coverage must be > 0.'; return; } if (isNaN(finCoats) || finCoats 6) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Number of Finish Coats must be between 1 and 6.'; return; } if (isNaN(sandCov) || sandCov Sandpaper Sheet Coverage must be > 0.'; return; } if (isNaN(sandPasses) || sandPasses 6) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Sanding Passes must be between 1 and 6.'; return; }
// --- Core Calculations ---
// Base area (sq ft) var baseArea = length * width;
// Effective area with waste factor // effectiveArea = baseArea * (1 + waste/100) var effectiveArea = baseArea * (1 + waste / 100);
// Stain // quartsStain = effectiveArea / stainCov (one coat of stain) var quartsStainRaw = effectiveArea / stainCov; var quartsStain = Math.ceil(quartsStainRaw * 4) / 4; // round up to nearest 0.25 qt var gallonsStain = quartsStain / 4;
// Polyurethane Finish // quartsFinish = (effectiveArea * finCoats) / finishCov var quartsFinishRaw = (effectiveArea * finCoats) / finishCov; var quartsFinish = Math.ceil(quartsFinishRaw * 4) / 4; var gallonsFinish = quartsFinish / 4;
// Sandpaper // sheetsNeeded = ceil((effectiveArea * sandPasses) / sandCov) var sheetsNeeded = Math.ceil((effectiveArea * sandPasses) / sandCov);
// Helper: format gallons/quarts nicely function formatVolume(quarts) { var gal = Math.floor(quarts / 4); var qt = quarts % 4; if (gal > 0 && qt > 0) { return gal + ' gal + ' + qt.toFixed(2) + ' qt'; } else if (gal > 0) { return gal + ' gallon' + (gal !== 1 ? 's' : ''); } else { return quarts.toFixed(2) + ' quart' + (quarts !== 1 ? 's' : ''); } }
// --- Output --- var html = '### Results '; html += ''; html += 'ItemAmount'; html += 'Base Floor Area' + baseArea.toFixed(1) + ' sq ft'; html += 'Effective Area (with ' + waste + '% waste)' + effectiveArea.toFixed(1) + ' sq ft'; html += 'Stain Needed (1 coat)' + quartsStain.toFixed(2) + ' qt (' + formatVolume(quartsStain) + ')'; html += 'Polyurethane Finish Needed (' + finCoats + ' coat' + (finCoats > 1 ? 's' : '') + ')' + quartsFinish.toFixed(2) + ' qt (' + formatVolume(quartsFinish) + ')'; html += 'Sandpaper Sheets Needed (' + sandPasses + ' pass' + (sandPasses > 1 ? 'es' : '') + ')' + sheetsNeeded + ' sheets'; html += '';
// Purchase recommendations (round up to whole quarts / gallons) var buyStainGal = Math.ceil(gallonsStain); var buyFinishGal = Math.ceil(gallonsFinish); html += 'Purchase Recommendation: Buy at least ' + buyStainGal + ' gallon' + (buyStainGal !== 1 ? 's' : '') + ' of stain and ' + buyFinishGal + ' gallon' + (buyFinishGal !== 1 ? 's' : '') + ' of polyurethane finish.
';
resultDiv.style.display = 'block'; resultDiv.innerHTML = html; }
#### Formulas Used
Base Area (sq ft) = Length (ft) × Width (ft)
Effective Area (sq ft) = Base Area × (1 + Waste Factor / 100)
Stain Needed (quarts) = Effective Area ÷ Stain Coverage (sq ft/qt) — rounded up to nearest ¼ quart
Finish Needed (quarts) = (Effective Area × Number of Coats) ÷ Finish Coverage (sq ft/qt) — rounded up to nearest ¼ quart
Sandpaper Sheets = ⌈ (Effective Area × Sanding Passes) ÷ Sheet Coverage (sq ft/sheet) ⌉
#### Assumptions & References
- Default stain coverage: 125 sq ft per quart (one coat), per Minwax and Varathane product specifications.
- Default polyurethane finish coverage: 125 sq ft per quart per coat, consistent with major brand datasheets (Minwax, Bona).
- Industry standard recommendation is 3 coats of finish for residential hardwood floors (NWFA guidelines).
- Default sandpaper sheet coverage: 50 sq ft per sheet for drum/orbital sander sheets (typical 8″×19″ drum sander sheet).
- Default 3 sanding passes: coarse (36–60 grit), medium (80 grit), fine (100–120 grit) — per NWFA sanding standards.
- A 10% waste factor is recommended to account for edges, corners, and irregular room shapes.
- Reference: National Wood Flooring Association (NWFA) — Installation Guidelines & Sand and Finish Guidelines.
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