Grape Harvest Sugar to ABV Estimator
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.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; } }
Grape Harvest Sugar to ABV Estimator
Estimate the potential alcohol by volume (ABV) of your wine from grape must sugar content measured in Brix, Baumé, or Specific Gravity. Uses industry-standard conversion formulas used by winemakers worldwide.
Sugar Measurement Unit
Brix (°Bx) Baumé (°Bé) Specific Gravity (SG)
Sugar Content (°Bx)
Fermentation Efficiency (%)
Typical range: 90–100%. Accounts for incomplete fermentation or residual sugar.
Calculate
function graUpdatePlaceholder() { var unit = document.getElementById('gra-unit').value; var label = document.getElementById('gra-sugar-label'); var input = document.getElementById('gra-sugar'); if (unit === 'brix') { label.textContent = 'Sugar Content (°Bx)'; input.placeholder = 'e.g. 24'; input.step = '0.1'; input.min = '0'; input.max = '40'; } else if (unit === 'baume') { label.textContent = 'Sugar Content (°Bé)'; input.placeholder = 'e.g. 13.5'; input.step = '0.1'; input.min = '0'; input.max = '25'; } else { label.textContent = 'Specific Gravity (SG)'; input.placeholder = 'e.g. 1.100'; input.step = '0.001'; input.min = '1.000'; input.max = '1.200'; } input.value = ''; }
function graCalc() { var unit = document.getElementById('gra-unit').value; var sugarVal = parseFloat(document.getElementById('gra-sugar').value); var efficiency = parseFloat(document.getElementById('gra-efficiency').value); var resultDiv = document.getElementById('gra-result');
// --- Input Validation --- if (isNaN(sugarVal)) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Please enter a valid sugar content value.'; return; } if (isNaN(efficiency) || efficiency 100) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Fermentation efficiency must be between 50% and 100%.'; return; }
var brix;
// --- Unit Conversion to Brix --- if (unit === 'brix') { if (sugarVal 40) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Brix must be between 0 and 40 °Bx for typical grape must.'; return; } brix = sugarVal; } else if (unit === 'baume') { if (sugarVal 25) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Baumé must be between 0 and 25 °Bé for typical grape must.'; return; } // Brix ≈ Baumé × 1.8 (standard winemaking approximation) brix = sugarVal * 1.8; } else { if (sugarVal 1.200) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Specific Gravity must be between 1.000 and 1.200 for typical grape must.'; return; } // Brix from SG: Brix = (SG - 1) / 0.004 (simplified) // More accurate: Brix = 261.3 × (1 - 1/SG) [Plato approximation] brix = 261.3 * (1 - 1 / sugarVal); }
// --- Potential ABV Calculation --- // Standard formula: Potential ABV (%) = Brix × 0.55 // More precise winemaking formula (Boulton et al.): // Potential ABV = (Brix / (258.6 - (Brix / 1.0665))) × 76.08 // This accounts for the density change during fermentation. var potentialABV = (brix / (258.6 - (brix / 1.0665))) * 76.08;
// Apply fermentation efficiency var actualABV = potentialABV * (efficiency / 100);
// Residual sugar estimate (g/L) — sugar not converted // Approx: 1 °Brix ≈ 10 g/L sugar in must var residualSugarGL = brix * 10 * (1 - efficiency / 100);
// Sugar in g/L (approximate): 1 °Brix ≈ 10 g/L var sugarGL = brix * 10;
// Wine style classification var style = ''; if (actualABV ' + 'Equivalent Brix' + brixDisplay + ' °Bx' + 'Equivalent Specific Gravity' + sgDisplay + '' + 'Equivalent Baumé' + baumeDisplay + ' °Bé' + 'Approximate Sugar Content' + sugarGL.toFixed(0) + ' g/L' + 'Potential ABV (100% efficiency)' + potentialABV.toFixed(2) + '%' + 'Estimated Actual ABV (' + efficiency + '% efficiency)' + actualABV.toFixed(2) + '%' + 'Estimated Residual Sugar' + residualSugarGL.toFixed(1) + ' g/L' + 'Wine Style' + style + '' + 'Ripeness Assessment' + ripeness + '' + ''; }
#### Formulas Used
1. Brix from Specific Gravity (Plato approximation): Brix = 261.3 × (1 − 1 / SG)
2. Brix from Baumé: Brix = Baumé × 1.8
3. Potential ABV from Brix (Boulton et al. winemaking formula): Potential ABV (%) = [Brix ÷ (258.6 − Brix ÷ 1.0665)] × 76.08
4. Actual ABV with fermentation efficiency: Actual ABV (%) = Potential ABV × (Efficiency ÷ 100)
5. Approximate sugar content: Sugar (g/L) ≈ Brix × 10
6. Residual sugar: Residual Sugar (g/L) ≈ Sugar (g/L) × (1 − Efficiency ÷ 100)
#### Assumptions & References
- Reference: Boulton, R.B., Singleton, V.L., Bisson, L.F., & Kunkee, R.E. (1996). Principles and Practices of Winemaking. Springer.
- Reference: Iland, P., Bruer, N., Edwards, G., Weeks, S., & Wilkes, E. (2004). Chemical Analysis of Grapes and Wine. Patrick Iland Wine Promotions.
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