Paint Dilution and Mixing Ratio Calculator
ANA›Life Services Authority›National Calculator Authority›Paint Dilution and Mixing 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; } }
Paint Dilution and Mixing Ratio Calculator
Calculate how much thinner to add for a desired dilution ratio, or determine proportions when mixing multiple paint colors together.
Calculator Mode
Dilution (Paint + Thinner) Color Mixing (Multiple Paints)
Paint Amount
Unit
ml L fl oz gal
Dilution Input Method
Ratio (Paint : Thinner) Dilution Percentage (%)
Paint Parts
Thinner Parts
Dilution Percentage (% thinner relative to paint)
e.g. 10% means add 10 ml thinner per 100 ml paint
Target Total Volume
ml L fl oz gal
- Add Color − Remove Color
Enter ratio parts for each color (e.g. 2, 1, 1 gives 50%, 25%, 25%)
Calculate
#### Formulas Used
Dilution by Ratio (Paint : Thinner = P : T):
Dilution by Percentage (D%):
Color Mixing:
#### Assumptions & References
(function() { var colorCount = 3;
function toMl(val, unit) { if (unit === 'ml') return val; if (unit === 'L') return val * 1000; if (unit === 'oz') return val * 29.5735; if (unit === 'gal') return val * 3785.41; return val; }
function fromMl(val, unit) { if (unit === 'ml') return val; if (unit === 'L') return val / 1000; if (unit === 'oz') return val / 29.5735; if (unit === 'gal') return val / 3785.41; return val; }
function fmt(n, decimals) { decimals = decimals === undefined ? 2 : decimals; return parseFloat(n.toFixed(decimals)).toLocaleString(undefined, {maximumFractionDigits: decimals}); }
function unitLabel(unit) { return unit === 'oz' ? 'fl oz' : unit; }
window.paiToggleMode = function() { var mode = document.getElementById('pai-mode').value; document.getElementById('pai-dilution-section').style.display = mode === 'dilution' ? '' : 'none'; document.getElementById('pai-mixing-section').style.display = mode === 'mixing' ? '' : 'none'; document.getElementById('pai-result').style.display = 'none'; };
window.paiToggleDilutionMethod = function() { var method = document.getElementById('pai-dilution-method').value; document.getElementById('pai-ratio-inputs').style.display = method === 'ratio' ? '' : 'none'; document.getElementById('pai-percent-input').style.display = method === 'percent' ? '' : 'none'; };
function buildColorRows() { var container = document.getElementById('pai-colors-container'); container.innerHTML = ''; var colors = ['Red','Blue','Yellow','White','Black','Green','Orange','Purple','Brown','Cyan']; for (var i = 0; i Color ' + (i+1) + ' Name' + 'Ratio Parts' + ''; container.appendChild(row); } }
window.paiAddColor = function() { if (colorCount >= 10) { alert('Maximum 10 colors allowed.'); return; } colorCount++; buildColorRows(); };
window.paiRemoveColor = function() { if (colorCount 900) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Dilution percentage seems unrealistically high (max 900%).
'; return; } thinnerMl = paintMl * (dPct / 100); totalMl = paintMl + thinnerMl; paintPct = (paintMl / totalMl) * 100; thinnerPct = (thinnerMl / totalMl) * 100; var rP = 1, rT = dPct / 100; ratioStr = '1 : ' + fmt(rT, 3); }
var thinnerOut = fromMl(thinnerMl, unit); var totalOut = fromMl(totalMl, unit); var ul = unitLabel(unit);
resultDiv.style.display = 'block'; resultDiv.innerHTML = '### Dilution Results ' + '' + 'Paint Amount' + '' + fmt(paintRaw) + ' ' + ul + '' + 'Thinner to Add' + '' + fmt(thinnerOut) + ' ' + ul + '' + 'Total Mixture' + '' + fmt(totalOut) + ' ' + ul + '' + 'Mix Ratio (Paint:Thinner)' + '' + ratioStr + '' + 'Paint in Mixture' + '' + fmt(paintPct) + '%' + 'Thinner in Mixture' + '' + fmt(thinnerPct) + '%' + '' + '' + 'Tip: For spray guns, typical dilution is 10–20%. For airbrushes, 50–100%. Always test on a scrap surface first.' + '';
} else { // MIXING MODE var totalRaw = parseFloat(document.getElementById('pai-total-volume').value); var mixUnit = document.getElementById('pai-mix-unit').value;
if (isNaN(totalRaw) || totalRaw ' + '' + '' + names[j] + '' + '' + fmt(ratios[j], 3) + '' + '' + fmt(volOut) + ' ' + ulMix + '' + '' + '' + '' + '' + fmt(pct, 1) + '%' + ''; }
// Simplify ratio string var gcdVal = ratios.reduce(function(a, b) { a = Math.round(a * 1000); b = Math.round(b * 1000); while (b) { var t = b; b = a % b; a = t; } return a / 1000; }); var ratioSimple = ratios.map(function(r) { return fmt(r / gcdVal, 2); }).join(' : ');
resultDiv.style.display = 'block'; resultDiv.innerHTML = '### Color Mixing Results ' + 'Simplified Ratio: ' + ratioSimple + ' | Total Volume: ' + fmt(totalRaw) + ' ' + ulMix + '
' + '' + '' + 'Color' + 'Parts' + 'Volume' + 'Proportion' + '' + rows + '' + '' + 'Note: Mix colors thoroughly. Actual color appearance depends on pigment strength and opacity of each paint.' + ''; } };
// Initialize color rows on load buildColorRows(); })();
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