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Reseller fee & profit calculator for eBay, Poshmark, Mercari & Depop. See your real net — or price backward from target profit. Stop guessing what you'll actually keep. This calculator shows your real net profit on eBay, Poshmark, Mercari and Depop after every seller fee — in one popup, one click from any tab. WHAT IT DOES • Net profit, fast. Enter your list price, shipping, item cost and (eBay) sales tax — see the fee breakdown, what the marketplace pays you, your net, margin and ROI. • Reverse mode. Type the profit you want to keep and it solves the exact price to list at — including the tricky fee boundaries (like Poshmark's $15 jump) where two prices can hit the same net. • Compare view. One item, all four marketplaces, side by side, sorted by what you keep. The winner changes with price and who pays shipping. • Break-even. Instantly see the price that just covers fees, shipping and your item cost. 2026 FEES, VERIFIED Every rule comes straight from the official marketplace fee pages and carries a last-verified date you can click to check: • eBay — 13.6% in most categories (+ per-order fee), with category overrides for sneakers, trading cards, handbags, jewelry, books and more. It even accounts for eBay charging its fee on shipping AND sales tax — the part most calculators miss. • Poshmark — flat $2.95 under $15, 20% at $15+, shipping label included. • Mercari — flat 10%, no separate seller processing fee. • Depop — 0% commission for US sellers, 3.3% + $0.45 processing, optional Boosted Listings +8%. PRIVATE BY DESIGN • Works fully offline. The fee data is bundled in the extension — no network calls. • Collects nothing. No account, no login, no tracking. Your numbers stay on your device. • Never connects to your marketplace accounts. FREE The whole calculator is free. No paywall on any single calculation. This extension is an independent tool and is not affiliated with, endorsed by, or sponsored by eBay, Poshmark, Mercari or Depop. All trademarks belong to their respective owners. Estimates only — not financial or tax advice. Marketplace fees can change; always confirm against the official pages (linked inside).