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.
Your estimated value will appear here.
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
- This tool provides an estimate only. Actual market value depends on current demand, recent comparable sales, and professional appraisal.