How to use these calculators
A marketplace listing should not be priced from product cost alone. First account for percentage fees, fixed seller charges, shipping and advertising on each order. Then test whether expected returns erase that contribution. The return model uses a separate unrecoverable loss estimate to avoid treating a return as a normal completed sale.
A worked scenario
Minimum cent-rounded break-even listing price: $32.96; expected contribution with returns: $14.70/order.
Returns and seller fees affect different stages of the decision. Keep the assumptions explicit and avoid using a universal platform rate.
How to plan this decision
- Separate fee types
Confirm which fees scale with price and which are fixed per order.
- Calculate realistic return losses
Use net unrecoverable cost after resale and refunds, not the sticker price automatically.
- Test lower margins
Increase fee rates or return shares to see when an apparently safe price becomes fragile.
Read the detailed worked guide →
Start with the formula
Learn why margin and markup produce different percentages and how to use each one when setting prices.
Read Margin vs. Markup: the Difference That Changes Your Pricing →