The marketplace fee calculator built for resellers

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 13.35% 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 advertising, no third-party trackers, no cross-site scripts.
• No server-side storage of your numbers — everything is local.
• No affiliate kickbacks skewing the recommendations.

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.