About SellerFees

Marketplace fees are the tax nobody quotes you upfront. A "great price" on paper becomes a different number after commission, payment processing, and fixed charges — and the structures themselves move every year. Sellers deserve the real payout number, the full line-item breakdown, and a straight answer about how fresh the rates are.

That is what SellerFees does: one calculator per marketplace, every fee line itemized, and an as-of date stamped on every result alongside a link to the platform's official fee page. When a structure changes — Whatnot re-tiered commissions in September 2026, Mercari restructured in January 2025 — the calculators get updated and re-stamped. Honest math beats confident math.

The site is independent and not affiliated with any marketplace. Nothing is uploaded — the calculations run in your browser. And nothing pretends to be your invoice: for a real order, the platform's transaction record is always the final word.