Marketplace fee calculators
Know exactly what each platform takes before you list. Every calculator shows its last-verified date and links to the official fee policy — because marketplace fees change, and stale numbers cost you money.
- Whatnot Fee Calculator 8% commission + 2.9% + $0.30 processing. See your exact payout.
- StockX Fee Calculator Seller level 1–4 transaction fees + 3% processing, updated for 2026.
- Poshmark Fee Calculator Flat $2.95 under $15, 20% above. Calculate your earnings instantly.
Why another fee calculator?
Most fee calculators were built once and abandoned — they still show 2023 rates. Ours work differently: every rate lives in a versioned data file with its effective date and official source, and we monitor platform fee announcements weekly. When Whatnot or StockX changes a rate, the calculators update within days, not years.
More platforms are coming — eBay, Etsy, Mercari, Depop — plus a cross-platform comparison tool that shows your net payout on every marketplace side by side for the same item.
🔒 Everything is calculated in your browser — nothing you type is sent to a server