Investment Calculators
Make data-driven decisions with interactive tools for sports card investing.
Grading ROI Calculator
Determine if grading your cards is profitable. Calculate net profit and ROI based on card value and expected grade.
💡 Use when: Should I grade this card?
Box Break-even Calculator
Calculate the expected value (EV) of opening a sealed box. Determine if ripping is worth it at current prices.
💡 Use when: Is this box worth opening?
Sealed Hold vs Rip Calculator
Compare long-term holding sealed boxes against immediate ripping. Project appreciation and make strategic decisions.
💡 Use when: Should I hold or rip my sealed?
Break Spot EV Calculator
What the room pays versus what the box holds, and the breaker’s break-even spot price after platform fees. Both sides of one break.
💡 Use when: Is this break spot worth it?
Stream Comp Overlay
Show live comps on your Whatnot or eBay Live stream from your phone — an OBS browser source fed by real market data.
💡 Use when: Comps on stream, hands-free
Break Receipts
Turn a break into a shareable, live-updating receipt: paid vs. Wildcard EV vs. actual pulls, every value from market comps.
💡 Use when: Prove how the break went
How to Use These Tools
- Grading ROI: Enter your card's current value and expected grade to see if grading costs justify the price increase.
- Box Break-even: Input box cost and expected hit rate to calculate if opening the box has positive expected value.
- Hold vs Rip: Compare long-term sealed appreciation against immediate ripping to determine your best strategy.
💡 Tip: Combine multiple calculators for comprehensive investment analysis. Use results alongside market research for best decisions.
Skip the arithmetic once a week
The calculators above run one box at a time. The Monday digest runs the same math over the whole catalog and emails the five sealed boxes priced furthest under the value of the cards inside. Free, no account.
One confirmation link, then one email on Monday mornings. Nothing else, and unsubscribe in one click from any of them. Want alerts on one card instead? Watch a card →
Learn More
Want deeper insights? Check out our investment guides and blog articles.