Stucco Mix Ratio Calculator

ANA›Life Services Authority›National Calculator Authority›Stucco Mix Ratio 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; } }

Stucco Mix Ratio Calculator

Calculate the quantities of cement, sand, lime, and water needed for your stucco project based on coat type, area, and thickness.

Coat Type

Scratch Coat (1:2.5:0.5 — Cement:Sand:Lime) Brown Coat (1:3:0.5 — Cement:Sand:Lime) Finish Coat (1:1.5:1 — Cement:Sand:Lime) Custom Ratio

Custom Ratio (Cement : Sand : Lime)

:

:

Surface Area (sq ft)

Coat Thickness (inches)

Scratch: 3/8" | Brown: 3/8" | Finish: 1/8"

Waste Factor (%)

Output Unit

Cubic Feet 60 lb Bags (Cement)

Calculate

function stuUpdateRatio() { var coat = document.getElementById('stu-coat-type').value; var customRow = document.getElementById('stu-custom-row'); var thickness = document.getElementById('stu-thickness'); if (coat === 'custom') { customRow.style.display = 'flex'; customRow.style.flexDirection = 'column'; } else { customRow.style.display = 'none'; } if (coat === 'scratch') thickness.value = '0.375'; else if (coat === 'brown') thickness.value = '0.375'; else if (coat === 'finish') thickness.value = '0.125'; }

function stuCalc() { var resultDiv = document.getElementById('stu-result'); resultDiv.style.display = 'block';

// --- Inputs --- var coat = document.getElementById('stu-coat-type').value; var area = parseFloat(document.getElementById('stu-area').value); var thickness = parseFloat(document.getElementById('stu-thickness').value); var waste = parseFloat(document.getElementById('stu-waste').value); var unit = document.getElementById('stu-unit').value;

// --- Validation --- if (isNaN(area) || area ⚠ Please enter a valid surface area greater than 0.'; return; } if (isNaN(thickness) || thickness 2) { resultDiv.innerHTML = '⚠ Thickness must be between 0.0625 and 2 inches.'; return; } if (isNaN(waste) || waste 50) { resultDiv.innerHTML = '⚠ Waste factor must be between 0% and 50%.'; return; }

// --- Ratios --- var cRatio, sRatio, lRatio; if (coat === 'scratch') { cRatio = 1; sRatio = 2.5; lRatio = 0.5; } else if (coat === 'brown') { cRatio = 1; sRatio = 3.0; lRatio = 0.5; } else if (coat === 'finish') { cRatio = 1; sRatio = 1.5; lRatio = 1.0; } else { cRatio = parseFloat(document.getElementById('stu-cement-ratio').value); sRatio = parseFloat(document.getElementById('stu-sand-ratio').value); lRatio = parseFloat(document.getElementById('stu-lime-ratio').value); if (isNaN(cRatio) || cRatio ⚠ Please enter valid custom ratios (cement > 0, sand > 0, lime ≥ 0).'; return; } }

// --- Core Formula --- // Step 1: Gross volume of stucco needed (cubic feet) // Volume (cf) = Area (sf) × Thickness (in) / 12 var grossVolumeCF = area * (thickness / 12);

// Step 2: Apply waste factor // Adjusted Volume = Gross Volume × (1 + waste% / 100) var adjustedVolumeCF = grossVolumeCF * (1 + waste / 100);

// Step 3: Account for volume reduction due to mixing (dry materials compact ~33%) // Dry material volume needed = Adjusted Volume / 0.67 var dryVolumeCF = adjustedVolumeCF / 0.67;

// Step 4: Total ratio parts var totalParts = cRatio + sRatio + lRatio;

// Step 5: Individual material volumes (cf) var cementCF = (cRatio / totalParts) * dryVolumeCF; var sandCF = (sRatio / totalParts) * dryVolumeCF; var limeCF = (lRatio / totalParts) * dryVolumeCF;

// Step 6: Water — water-to-cement ratio ~0.5 by weight; cement density ~94 lb/cf // Water (gallons) = cementCF × 94 lb/cf × 0.5 / 8.34 lb/gal var waterGal = (cementCF * 94 * 0.5) / 8.34;

// Step 7: Convert cement to 60 lb bags if needed // 1 cf cement ≈ 94 lb → bags = cementCF × 94 / 60 var cementBags = (cementCF * 94) / 60;

// Step 8: Sand in tons (density ~100 lb/cf) var sandLbs = sandCF * 100; var sandTons = sandLbs / 2000;

// Step 9: Lime in lbs (density ~40 lb/cf) var limeLbs = limeCF * 40;

// --- Format --- function fmt(n, d) { return n.toFixed(d !== undefined ? d : 2); }

var coatLabel = coat === 'scratch' ? 'Scratch Coat' : coat === 'brown' ? 'Brown Coat' : coat === 'finish' ? 'Finish Coat' : 'Custom Mix'; var ratioStr = cRatio + ' : ' + sRatio + ' : ' + lRatio + ' (Cement : Sand : Lime)';

var cementDisplay = unit === 'bags'
? '' + fmt(cementBags, 1) + ' bags (60 lb bags) of Portland Cement'
'' + fmt(cementCF) + ' ft³ of Portland Cement (' + fmt(cementBags, 1) + ' × 60 lb bags)';

resultDiv.innerHTML = '### Results — ' + coatLabel + ' ' + '' + 'MaterialQuantity' + 'Mix Ratio' + ratioStr + '' + 'Surface Area' + fmt(area, 0) + ' ft²' + 'Coat Thickness' + fmt(thickness, 4) + '" (' + fmt(thickness/12, 4) + ' ft)' + 'Gross Stucco Volume' + fmt(grossVolumeCF) + ' ft³' + 'Adjusted Volume (incl. ' + fmt(waste,0) + '% waste)' + fmt(adjustedVolumeCF) + ' ft³' + 'Portland Cement' + cementDisplay + '' + 'Sand' + fmt(sandCF) + ' ft³ ≈ ' + fmt(sandTons, 2) + ' tons (' + fmt(sandLbs, 0) + ' lbs)' + 'Hydrated Lime' + fmt(limeCF) + ' ft³ ≈ ' + fmt(limeLbs, 0) + ' lbs' + 'Water' + fmt(waterGal, 1) + ' gallons (w/c ratio = 0.50)' + '' + 'ⓘ Dry volume inflated by ÷0.67 to account for compaction during mixing. Adjust water on-site for desired workability.

'; }

#### Formulas Used

1. Gross Volume (ft³) Vgross = Area (ft²) × Thickness (in) ÷ 12

2. Adjusted Volume (with waste) Vadj = Vgross × (1 + Waste% ÷ 100)

3. Dry Material Volume (compaction factor) Vdry = Vadj ÷ 0.67 Dry materials reduce ~33% in volume when mixed with water.

4. Individual Material Volumes Vcement = (C ÷ (C+S+L)) × Vdry Vsand = (S ÷ (C+S+L)) × Vdry Vlime = (L ÷ (C+S+L)) × Vdry

5. Cement Bags (60 lb) Bags = Vcement × 94 lb/ft³ ÷ 60 lb/bag

6. Water (gallons) Water = Vcement × 94 lb/ft³ × 0.50 ÷ 8.34 lb/gal Water-to-cement ratio = 0.50 by weight.

#### Assumptions & References

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References

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