Model Mercari’s public 10% seller-fee baseline on item price + buyer-paid shipping, then see payout before costs, true net profit, break-even listing price, and target-profit price.
Mercari lists Buyer Protection as a buyer-side fee. This calculator focuses on seller proceeds and seller-controlled pricing.
Mercari’s public help text says the 10% seller fee applies to item price plus buyer-paid shipping, so shipping collected still creates fee drag.
If one sale effectively absorbs the whole transfer, enter $3. If you batch multiple sales into one payout, enter your allocated per-sale amount instead.