Doing retail arbitrage? Buy on one marketplace, resell on another, and see your real profit and ROI after fees, promotions, shipping, and sales tax.
Fee estimates use the primary tier rate from each platform's public schedule. Tiered pricing, promotion rates, and buyer-fee ranges vary — always confirm current rates with the platform before listing.
Kickflip is a retail arbitrage calculator. Retail arbitrage is buying an item in one place — a clearance rack, a thrift store, an underpriced auction — and reselling it where the same item is worth more. The idea is simple; the arithmetic is not, because both sides of the trade carry costs that never show up on the listing page.
Say you find a pair of sneakers for $80 with $9 shipping and 7% sales tax. Your real cost is not $80, it is about $94.60. List them at $150 on eBay in a standard category and the final value fee is 13.6% of the total sale plus a $0.40 per-order fee — and that fee is charged on the item price plus buyer shipping plus tax, not the item price alone. Add a $12 label and a 4% Promoted Listings ad rate and the $70 spread you thought you had is closer to $20. That is the number that decides whether the flip was worth doing.
The calculator above runs that math for you across both platforms, shows the buying and selling fee stacks side by side, and reports profit in dollars alongside margin as a percentage. Turn on target margin to work in reverse: name the return you want and it solves for the sale price — or the maximum you can pay — to get there.
Buying an item at one price and reselling it somewhere the same item sells for more. Your profit is the spread between the two prices, minus every fee, shipping cost and tax on both sides of the trade.
The calculator carries published fee schedules for more than 20 marketplaces, including eBay, Mercari, Poshmark, Depop, Grailed, StockX, GOAT, Etsy, Vinted, Reverb, Whatnot, Facebook Marketplace, OfferUp and private sales.
Yes. Paste an auction link and it pulls the current price rather than the buy-it-now, and target margin mode gives you a maximum bid so you know when to stop.
New to this? Start with the retail arbitrage guide and calculator.