Wood Moisture Content Calculator
ANA›Life Services Authority›National Calculator Authority›Wood Moisture Content 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; } }
Wood Moisture Content Calculator
Calculate the moisture content (MC) of wood using the oven-dry method — the standard technique used in lumber, forestry, and woodworking industries.
Wet Weight (Wwet)
grams (or any consistent unit)
Oven-Dry Weight (Wdry)
grams (or any consistent unit)
Moisture Content Basis
Dry Basis (standard / oven-dry basis) Wet Basis (green weight basis)
Calculate
function wooCalc() { const resultDiv = document.getElementById('woo-result'); resultDiv.style.display = 'block';
const wetWeight = parseFloat(document.getElementById('woo-wet-weight').value); const dryWeight = parseFloat(document.getElementById('woo-dry-weight').value); const method = document.getElementById('woo-method').value;
// --- Input Validation --- if (isNaN(wetWeight) || isNaN(dryWeight)) { resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = '⚠ Please enter both wet weight and oven-dry weight.'; return; } if (wetWeight wetWeight) { resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = '⚠ Oven-dry weight cannot exceed wet weight. Wood loses mass when dried.'; return; } if (wetWeight === dryWeight) { resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = '⚠ Wet and dry weights are equal — moisture content is 0%. The wood appears to be already dry.'; return; }
// --- Core Calculations --- const waterMass = wetWeight - dryWeight;
let mc, basisLabel; if (method === 'dry') { // Dry-basis MC (most common in wood science / lumber industry) mc = (waterMass / dryWeight) * 100; basisLabel = 'Dry Basis (Oven-Dry)'; } else { // Wet-basis MC (used in some agricultural / green-wood contexts) mc = (waterMass / wetWeight) * 100; basisLabel = 'Wet Basis (Green Weight)'; }
// --- Wood Classification --- let classification, classColor, classNote; if (method === 'dry') { if (mc Moisture Content (${basisLabel})${mc.toFixed(2)}% Water Mass Removed${waterMass.toFixed(4)} units Wet Weight${wetWeight.toFixed(4)} units Oven-Dry Weight${dryWeight.toFixed(4)} units MC — Dry Basis${mcDry.toFixed(2)}% MC — Wet Basis${mcWet.toFixed(2)}%
Wood Classification ${classification}
${classNote}
`; }
#### Formulas Used
Dry-Basis Moisture Content (standard — ASTM D4442):
MCdry (%) = [(Wwet − Wdry) / Wdry] × 100
Wet-Basis Moisture Content:
MCwet (%) = [(Wwet − Wdry) / Wwet] × 100
Where:
- Wwet = Original (wet/green) weight of the wood sample
- Wdry = Weight after oven-drying to constant mass (typically at 103 ± 2°C)
- Wwet − Wdry = Mass of water evaporated
Conversion between bases:
MCwet = MCdry / (1 + MCdry/100) | MCdry = MCwet / (1 − MCwet/100)
#### Assumptions & References
- The oven-dry method is the gold standard: samples are dried at 103 ± 2°C until constant mass is achieved (typically 24–48 hours).
- Dry-basis MC is the industry standard in lumber, timber engineering, and wood science (ASTM D4442, ISO 3130).
- Wet-basis MC is used in some agricultural, pulp/paper, and green-wood contexts.
- The fiber saturation point (FSP) is approximately 25–30% MC (dry basis) for most wood species — above this, free water exists in cell cavities.
- Typical equilibrium moisture content (EMC) for interior wood in temperate climates: 6–9% (dry basis).
- References: ASTM D4442-20 (Direct Moisture Content Measurement), ISO 3130:1975 (Wood — Determination of moisture content), USDA Forest Products Laboratory Wood Handbook (2021).
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