Reseller Profit Calculator
Free · eBay and Whatnot rates built in, last verified July 2, 2026
The math that decides whether a flip works
Every flip is the same equation: what the buyer pays, minus what the platform takes, minus what you spent. People get in trouble by only looking at the first number. A $30 sale sounds good until fees take $4.50, the label takes $5, and the item cost $15. You worked for $5.50.
The two numbers worth watching are margin and ROI. Margin keeps your listings honest: if you're keeping less than a third of revenue, the item probably wasn't worth listing. ROI keeps your sourcing honest: cash that turns into 3x when it comes back builds a business; cash that turns into 1.2x builds a storage problem.
And because fees and shipping are mostly fixed, profit is really decided at the buy. That's the whole argument for checking sold prices before money leaves your pocket, not after.
Run this math on a whole shelf at once
Flippr estimates profit for every item in a photo: real eBay sold comps, your cost defaults, fee math included. Set your costs once in Preferences and the aisle does the rest.
Get Flippr freeCommon questions
How do I calculate reselling profit?
Revenue (sale price + shipping collected) minus marketplace fees, item cost, shipping label, and other costs like supplies or gas. That's the number that matters. Sale price alone tells you nothing.
What's a good profit margin for reselling?
Most experienced resellers aim for 50%+ margin or a 2-3x return on the cash they put in. A $2 thrift find selling for $15 clears both bars easily; a $20 buy selling for $30 usually doesn't after fees and shipping.
What's the difference between margin and ROI?
Margin is profit as a share of revenue: how much of the sale you keep. ROI is profit as a share of the cash you spent: how hard your money worked. Sourcing decisions should lean on ROI; a cheap item with modest margin can still be a great return.
Can I estimate profit before I buy an item?
Yes, that's exactly what Flippr does. Scan a shelf and it shows estimated profit per item using real eBay sold comps and your default costs, so the profitable items stand out before money leaves your pocket.
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