Seller Fee Desk

Seller Fee Desk is a set of free fee, net payout and profit calculators for people who sell online. Enter one price and it shows each platform's fees, each charged on the amount that platform really uses (item price, buyer-paid shipping, sales tax), and what lands in your account on eBay, Poshmark, Mercari, Depop, Etsy, Whatnot, Facebook and Amazon, ranked by what you keep.

There are 24 tools in all: a calculator per marketplace (including StockX and GOAT, TikTok Shop, Vinted and Grailed), profit and price-to-list calculators, a sales report analyzer, instant transfer fees for PayPal, Venmo, Cash App and Apple Cash, a dim weight calculator, a 1099-K checker and a tax set-aside calculator. Every fee rule links to the platform's own page with the date it was verified, and a fee change log lists confirmed changes with their sources.

The tools need no account and run in the browser; the numbers you type stay there. Results are estimates, not tax or financial advice, and the site is not affiliated with any platform it covers.