Collection Item Value Estimator

ANA›Life Services Authority›National Calculator Authority›Collection Item Value Estimator

.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; } }

Collection Item Value Estimator

Estimate the current market value of a collectible item based on its purchase price, age, condition, rarity, and category-specific appreciation rates.

Original Purchase Price ($)

Age of Item (years)

Category

Coins & Currency (5% / yr) Stamps (7% / yr) Sports Cards (8% / yr) Comic Books (9% / yr) Vintage Toys (6% / yr) Fine Art (10% / yr) Antique Furniture (7% / yr) Vinyl Records (8% / yr) Watches & Jewelry (6% / yr) General Collectibles (5% / yr)

Condition

Mint / Gem Mint (×1.50) Near Mint (×1.20) Excellent (×1.00) Very Good (×0.80) Good (×0.60) Fair / Poor (×0.40)

Rarity Score (1 = Common, 10 = Extremely Rare)

Provenance / Authentication Bonus (%)

Estimate Value Your estimated value will appear here.

function colCalc() { var resultDiv = document.getElementById('col-result');

var purchasePrice = parseFloat(document.getElementById('col-purchase-price').value); var age = parseFloat(document.getElementById('col-age').value); var annualRate = parseFloat(document.getElementById('col-category').value); var conditionMult = parseFloat(document.getElementById('col-condition').value); var rarity = parseFloat(document.getElementById('col-rarity').value); var provenance = parseFloat(document.getElementById('col-provenance').value);

// --- Validation --- if (isNaN(purchasePrice) || purchasePrice Please enter a valid purchase price greater than 0.'; return; } if (isNaN(age) || age Please enter a valid age (0 or more years).'; return; } if (isNaN(rarity) || rarity 10) { resultDiv.innerHTML = 'Rarity score must be between 1 and 10.'; return; } if (isNaN(provenance) || provenance 100) { resultDiv.innerHTML = 'Provenance bonus must be between 0% and 100%.'; return; }

/ * Formula: * * 1. Base Appreciated Value: * baseValue = purchasePrice × (1 + annualRate)^age * * 2. Rarity Multiplier (logarithmic scale, 1–10 → 1.0×–2.0×): * rarityMult = 1 + ln(rarity) / ln(10) * * 3. Condition Adjustment: * conditionedValue = baseValue × conditionMult * * 4. Rarity Adjustment: * rarityAdjusted = conditionedValue × rarityMult * * 5. Provenance / Authentication Bonus: * estimatedValue = rarityAdjusted × (1 + provenance / 100) /

var baseValue = purchasePrice * Math.pow(1 + annualRate, age); var rarityMult = 1 + Math.log(rarity) / Math.log(10); var conditioned = baseValue * conditionMult; var rarityAdjusted = conditioned * rarityMult; var estimatedValue = rarityAdjusted * (1 + provenance / 100);

var totalGain = estimatedValue - purchasePrice; var totalGainPct = ((estimatedValue - purchasePrice) / purchasePrice) * 100;

function fmt(n) { return n.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2}); }

var gainColor = totalGain >= 0 ? '#27ae60' : '#c0392b'; var gainSign = totalGain >= 0 ? '+' : '';

resultDiv.innerHTML = 'Estimated Current Value: $' + fmt(estimatedValue) + '' + 'Total Gain / Loss: ' + gainSign + '$' + fmt(totalGain) + ' (' + gainSign + fmt(totalGainPct) + '%)' + '' + 'Original Purchase Price$' + fmt(purchasePrice) + '' + 'Base Appreciated Value (after ' + age + ' yr @ ' + (annualRate100).toFixed(0) + '%/yr)$' + fmt(baseValue) + '' + 'After Condition Adjustment (×' + conditionMult.toFixed(2) + ')$' + fmt(conditioned) + '' + 'After Rarity Adjustment (×' + rarityMult.toFixed(3) + ', rarity=' + rarity + ')$' + fmt(rarityAdjusted) + '' + 'After Provenance Bonus (+' + provenance + '%)$' + fmt(estimatedValue) + '*' + ''; }

#### Formula

Step 1 – Base Appreciated Value: baseValue = purchasePrice × (1 + annualRate)age Step 2 – Rarity Multiplier (logarithmic, 1–10 → 1.00×–2.00×): rarityMult = 1 + ln(rarityScore) / ln(10) Step 3 – Condition Adjustment: conditionedValue = baseValue × conditionMultiplier Step 4 – Rarity Adjustment: rarityAdjusted = conditionedValue × rarityMult Step 5 – Provenance / Authentication Bonus: estimatedValue = rarityAdjusted × (1 + provenanceBonus / 100)

#### Assumptions & References

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References

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