ROI (Return on Investment)

ROI, or return on investment, measures the percentage gain or loss you have made on a card relative to what you originally paid for it. The formula is straightforward: subtract your purchase cost from the current value (or sale price), divide by the purchase cost, and multiply by 100. A card bought for $50 that is now worth $75 represents a 50% ROI. A card bought for $100 that has dropped to $80 represents a -20% ROI.

Tracking ROI is essential for collectors who view their cards as financial assets. While many people collect for the joy of it, understanding your returns helps you make informed decisions about which cards to hold, which to sell, and where to allocate future spending. It also reveals patterns in your buying behavior. You might discover that certain types of cards, such as sealed products, chase cards from new sets, or specific grading tiers, consistently deliver better returns than others.

CardDeckr’s portfolio tracker calculates ROI automatically for every card in your collection, provided you log your purchase price. The dashboard shows individual card ROI, portfolio-wide ROI, and historical performance over time. This turns your collection into a transparent investment portfolio where you can identify your best performers, cut your losses on declining cards, and make data-driven decisions about your TCG spending.