Free tool
Comic investment ROI calculator
Purchase price, current value, years held. Get your total and annualised ROI, compared against S&P 500 over the same period.
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Comic investment ROI is calculated as ((current value − purchase price) / purchase price) × 100, annualised over the holding period. Historical top key issues returned 15–30% annualised over 10 years. Modern speculation books often underperform stocks over the same period.
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Frequently Asked Questions
Top Silver/Bronze Age keys have beaten the S&P 500 over long holding periods. Modern speculation books underperform on average. Sample bias — survivorship — is real: most modern key issues peak on announcement and fade.
Yes. If you graded a book post-purchase, the full cost basis is purchase price + grading fees. The tool above doesn't ask for fees — add them to purchase price manually for accuracy.
Track ROI across every investment book in your collection
My Comics Collection logs purchase price per issue and compares it to current value — see ROI per book, per series, and for the whole collection.
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