Table of contents
SellerSum
Free fee & profit calculators for eBay, Etsy, PayPal, Stripe, Square and resale marketplaces — updated whenever fees change.
Seller Sum is a set of 13 free calculators that work out what a marketplace takes from a sale and what you actually keep. There's one for eBay, Etsy, PayPal, Stripe, Square, Whatnot, Depop, Poshmark and Mercari, plus margin, markup and food cost, and a hub that compares every marketplace's cut side by side.
Every rate comes from the marketplace's own published fee page. Each calculator shows the date the rate was last checked and links to the source, so you can confirm the number yourself. Where a marketplace publishes its own worked example, the calculator reproduces it to the cent.
A changelog records every fee change with the date it landed, and you can get one email when any tracked marketplace moves its rates.
No signup, no paywall.
