What we do
Fee Math builds calculators for people who sell online: makers on Etsy, Amazon and eBay sellers, and sellers on Ukrainian marketplaces. Each calculator takes a price and your costs and shows every marketplace fee as a separate line, with the rate behind it, and the profit that remains.
The goal is simple: you should know what a sale earns before you set the price, not after the payout arrives.
How we work
- Rates are taken from the marketplaces’ own fee pages and every calculator shows the date they were last checked, with links to the sources.
- Where a figure depends on your product or contract, the calculator asks you to enter it instead of guessing.
- The formulas are covered by automated tests, and calculations run in your browser, so the prices and costs you type are not sent to us.
- The full process is described on the methodology page.
Independence
Fee Math is not affiliated with, endorsed by or sponsored by Etsy, Amazon, eBay, Prom.ua, Rozetka, Nova Poshta or any other company named on the site. Marketplace names are used only to describe which fees a calculator covers.
The site is free to use. It may show advertising to cover hosting and development costs. Advertising never changes the rates or results shown by a calculator.
Found a mistake?
Marketplaces change fees often. If a rate looks out of date or a result does not match your statement, please write to contact@fee-math.com. Corrections are checked against the official source and published with a new update date. More ways to reach us are on the contact page.