What each marketplace charges a seller on one unit, computed from its own published rate cards and traced to the row the figure came from. No login, no modelling, no estimates where the card is silent.
The referral fee, the FBA fee and the profit left on one unit, for any category Amazon publishes a rate for.
Calculate your fees →The final value fee, the per order fee and the store subscription rates, on eBay's own marketplaces.
Calculate your fees →Shopify Payments rates and the third-party transaction fee, by plan.
Calculate your fees →Referral fees and Walmart Fulfillment Services (WFS) fees for Marketplace sellers.
Calculate your fees →Price the same unit on two or three marketplaces side by side: what each one charges fee by fee, what is left after costs, and how long each takes to pay you.
Compare fees →Every marketplace takes a share of each sale, and no two take it the same way. A fee calculator exists because the share is not a single percentage: it depends on the category, the price, who ships the unit, how heavy it is and which plan the account is on. Sellers reach for one when they are pricing a product, deciding whether a product is worth listing at all, or working out why a line that looked profitable in a spreadsheet is not profitable in the payout.
Amazon charges a referral fee per category and, where it ships the unit, a fulfilment fee selected by size tier and weight. eBay charges a final value fee, a per order fee, and insertion fees once a seller is past their allowance. Walmart charges a referral fee and, on Walmart Fulfillment Services, a fulfilment fee by weight. Shopify charges no referral fee at all and takes its share through payment processing, with a third-party transaction fee where another gateway is used. A figure that is right on one of them is not close on another, which is why each has its own calculator here rather than one page with a switch.
The platform with the lowest fees is not always the one that leaves the most profit, and the one that leaves the most profit is not always the one that pays soonest. A low-fee channel that holds funds for two weeks costs a seller working capital that a higher-fee channel paying weekly does not. Those are different questions and a per-unit fee answers only the first, so the comparison view above is being built to put all three beside each other.
Published rate cards and seller documentation, extracted per platform with the source URL and the date it was checked recorded against every row. Nothing is modelled, predicted or averaged: where a card is silent the figure is reported as not computed rather than filled in. The Amazon FBA fee calculator is the first one live, covering the US and UK stores.