Free Marketplace Profit calculator with clear step-by-step results.
Returns are the item most often left out of marketplace profit maths. Refunded orders lose their revenue entirely but only half their cost of goods on average, because much returned stock is resaleable - while shipping and advertising are sunk regardless.
Revenue kept
Kept = units x price x (1 - return rate)
Net profit
Profit = kept revenue - platform fees - cost of goods - shipping - advertising
Because much of it comes back saleable. Apparel and unsealed items lose more, sealed hard goods less - adjust the assumption if your category is unusual.
Yes if it is attributable to these units. If it also builds brand or drives off-platform sales, allocate only the share attributable to this listing.