About

The marketplace fee calculator built for resellers

PlatformFeeCalculator is a free, independent tool that helps online sellers see exactly what eBay, Etsy, and Poshmark take from each sale — and what actually lands in your pocket.

Runs in your browser

No server round-trip. Your numbers never leave your device.

No sign-up, ever

No account, no email capture. Just open it and type.

Verified against source

Every rate is checked against each platform's own published fee schedule.

Public correction log

Every rate fix is logged on the fee change log — nothing is corrected quietly.

Why we built it

Most fee calculators either bury the math behind a sign-up wall, show a number without telling you what went into it, or — worst of all — round-trip your inputs through a server. We wanted a calculator you can trust on a phone, in a hurry, while listing an item. So we built one that runs entirely in the browser, swaps to your local fee schedule automatically, and shows every line of the math in one card.

Who it’s for

Closet resellers pricing a bundle on Poshmark. eBay flippers modelling a 13.6% final value fee against their shipping cost. Etsy shop owners checking whether offsite ads are eating their margin. New sellers comparing platforms before they commit. Anyone who has ever asked “wait, how much did I actually make on that?”

How it works

The site is a small set of statically generated pages — one per platform — plus a pure JavaScript calculator. Your inputs never leave the browser. We read your locale to pre-select the right currency, and the matching localized fee schedule loads alongside it (US, UK, EU, Canada, Australia). Numbers refresh the moment you stop typing.

What we don’t do

No sign-up, no account, no email harvesting.
No server-side storage of your numbers — every calculation runs in your browser.
No affiliate deal ever changes a fee rate or a result — the math above is the math, full stop.

Two things we do run: Google Analytics and Google AdSense, like almost every free tool on the web, to keep the lights on without a paywall. Neither can see the numbers you type into the calculator — that math never leaves your browser — but we’d rather say so plainly than have you find out from a browser extension. On a couple of pages, we point to specific paid tools we think are genuinely worth a seller's time — right now that's eRank for Etsy SEO and Easyship for shipping — using affiliate links, clearly marked where they appear. Neither has any influence on a single fee number on this site: those recommendations are picked because we'd make the same one with no link attached, not the other way around.

Who keeps this accurate

This site is written and maintained by DSN. DSN researches each platform’s published fee schedule directly from its official seller centre, builds the calculation logic for it, and is the one who updates the numbers — and the “verified” date you see on every calculator — whenever a platform changes its rates.

Public fee change log Real replies, not a ticket queue

Found a number that looks off, or a platform we’re missing? Send DSN a note — every message gets a reply from a person, not a ticketing queue. Past corrections are logged publicly on the fee change log.

How we stay accurate

Fee schedules are kept in a single table inside the code, with a date stamp in the rule’s note and a “last updated” hint in the UI. Each platform’s standard rate is documented in the public seller centre — if a platform changes a number, we update it in one place and the whole site reflects it. The calculator is intentionally a model, not a billing system: always verify with the platform’s official seller centre before making decisions.

Get in touch

Spotted a wrong number, want a new platform, or have feedback? Send us a note — we read every message.