Sale price is not profit
A $100 sale is $100 of revenue, not $100 of earnings. The card had an acquisition cost, the marketplace may charge selling fees, and getting it to the buyer costs money. Profit is what remains after the relevant costs.
This calculator estimates: sold price − card cost − shipping you pay − (sold price × entered fee percentage). It does not automatically look up an eBay fee rate or account for every adjustment.
Start with the card’s cost basis
For this estimate, cost is the amount assigned to acquiring the card. If you bought one card for $40, start there. If it came from a lot, allocate part of the lot’s cost to that card rather than treating it as free. The sports card cost basis guide walks through both situations.
Use your actual selling fees
For eBay sports card sales, use the fee information from your seller records rather than assuming a universal percentage. Fees may depend on the category, account, transaction, and other charges. Fixed charges and fee bases can make an estimate differ from the final statement.
If you know the total dollar fee, divide it by the sale price and multiply by 100 to get an effective percentage for this estimate. For example, a $13.25 total fee on a $100 sale is 13.25%. A blank fee field means fees are not included.
Count shipping and additional expenses
Enter shipping you pay, including the label and packing supplies. Buyer-paid shipping is not automatically added to revenue by this tool. Make sure your inputs represent the sale you want to estimate, and avoid counting the same cost twice.
Promoted listing charges, grading, storage, show fees, returns, refunds, and other business costs can also affect your results. This calculator has no separate additional-expenses field: subtract any costs not already counted from the estimate when reviewing the sale. Taxes and other adjustments are excluded.
A $100 sale does not leave $100
A card sells for $100. You paid $40 for it and spend $5 on shipping and supplies. An illustrative fee input of 13.25% gives $13.25 in fees; this is not a standard eBay rate.
$100 − $40 − $5 − $13.25 = $41.75 estimated profit
If that sale also incurred an additional $2 expense not included above, the remaining amount would be $39.75. Any other adjustments still need to be reconciled.
Turn individual estimates into useful records
Keep the purchase record, sale record, and supporting fee and shipping detail together. Then you can review the whole business, not just the sales that looked good at first glance. See how to track sports card inventory for a practical workflow.