SellerCounter is a free set of fee calculators for people who sell on online marketplaces. It shows exactly what each platform takes from a sale, so you can price with confidence.
Why SellerCounter exists
Marketplace fees change often, and every platform counts them differently. In 2026 alone, Depop raised its Boosting fee from 8% to 12%, and Whatnot replaced its flat 8% commission with sales tiers.
Most fee calculators are a side project for a software company, and they can fall behind when fees change. SellerCounter has one job: getting the numbers right and keeping them current.
What makes it different
- Every fee is dated and sourced. Each calculator shows when we last checked its fees, with a link to the platform’s own fee page.
- The costs others skip. Mercari’s fee on shipping, Depop Boosting, VAT on UK Whatnot fees, Instant Pay cash-outs and whole Whatnot shows are all included.
- The math is shown. Every line of a result explains how it was worked out.
- It works backwards too. “What price do I need?” finds the lowest price that makes the profit you want.
- No sign-up, nothing sent to us. Calculators run in your browser, and the numbers you type stay there.
- A public record of fee changes. Every change we make is dated in our fee changelog.
Read how we calculate fees for the details.
Who runs SellerCounter
SellerCounter is run by Abdullah Saeed. I’ve been selling on Amazon for more than five years, and over that time I’ve learned how much a platform’s fees decide whether a sale is really worth it. I built SellerCounter for sellers who are new to selling online, or starting on a marketplace they haven’t used before, so they can see their real numbers before they list.
How SellerCounter is funded
SellerCounter is free and independent. It isn’t affiliated with Depop, Whatnot, Mercari or any other marketplace, and no platform pays us. In future we may show ads or recommend tools through affiliate links. If we do, they’ll be clearly labeled, and they’ll never change a calculator’s results.
Get in touch
Spotted a wrong fee, or want a calculator for a platform we don’t cover yet? Email info@sellercounter.com. Fee corrections go to the top of the list.