Alcohol Dilution Calculator
ANA›Life Services Authority›National Calculator Authority›Alcohol Dilution 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; } }
Alcohol Dilution Calculator
Calculate how much water (or diluent) to add to a high-strength alcohol solution to reach a desired lower concentration.
Initial Volume (mL)
Initial Concentration (% ABV)
Desired Final Concentration (% ABV)
Calculate
function alcCalc() { const resultDiv = document.getElementById('alc-result'); const v1 = parseFloat(document.getElementById('alc-v1').value); const c1 = parseFloat(document.getElementById('alc-c1').value); const c2 = parseFloat(document.getElementById('alc-c2').value);
// --- Validation --- if (isNaN(v1) || isNaN(c1) || isNaN(c2)) { resultDiv.innerHTML = 'Please fill in all three fields.'; return; } if (v1 Initial volume must be greater than 0.'; return; } if (c1 100) { resultDiv.innerHTML = 'Initial concentration must be between 0.001% and 100%.'; return; } if (c2 100) { resultDiv.innerHTML = 'Desired concentration must be between 0.001% and 100%.'; return; } if (c2 >= c1) { resultDiv.innerHTML = 'Desired concentration must be less than the initial concentration. You cannot dilute upward.'; return; }
// --- Core Formula: C1·V1 = C2·V2 → V2 = (C1·V1) / C2 --- const v2 = (c1 * v1) / c2; // final total volume (mL) const waterToAdd = v2 - v1; // volume of water to add (mL)
// --- Useful extras --- const pureAlcohol = (c1 / 100) * v1; // mL of pure alcohol present const dilutionFactor = c1 / c2;
resultDiv.innerHTML = '### Results ' + '' + 'Water to Add' + waterToAdd.toFixed(2) + ' mL' + 'Final Total Volume' + v2.toFixed(2) + ' mL' + 'Pure Alcohol Present' + pureAlcohol.toFixed(2) + ' mL' + 'Dilution Factor' + dilutionFactor.toFixed(4) + '×' + 'Initial → Final ABV' + c1.toFixed(2) + '% → ' + c2.toFixed(2) + '%' + ''; }
#### Formula
Based on the conservation of solute principle:
C₁ × V₁ = C₂ × V₂
Solving for the final volume:
V₂ = (C₁ × V₁) / C₂
Water to add:
Vwater = V₂ − V₁ = V₁ × (C₁/C₂ − 1)
Where C₁ = initial ABV (%), V₁ = initial volume (mL), C₂ = desired ABV (%), V₂ = final volume (mL).
#### Assumptions & References
- Concentrations are expressed as % ABV (Alcohol By Volume) — the standard used in distilling and spirits production.
- The diluent is assumed to be pure water (0% ABV).
- The formula assumes ideal mixing. In practice, mixing ethanol and water produces a slight volume contraction (~2–3% at mid-range concentrations) due to hydrogen bonding. For high-precision distilling, use the OIML International Alcoholometric Tables or TTB gauging tables.
- Temperature is assumed to be 20 °C (68 °F), the standard reference temperature for ABV measurement.
- Reference: OIML R 22 — International Alcoholometric Tables; US TTB (Alcohol and Tobacco Tax and Trade Bureau) Gauging Manual.
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