Amazon FBA looks appealing because Amazon handles storage, packing, and shipping — but that convenience comes with a long list of fees that can quietly eat your margin. Referral fees, fulfillment fees, storage costs, and potential long-term storage penalties all combine to determine your actual FBA profit margin, and that number is often very different from what sellers expect when they first calculate their product cost.
This is why experienced Amazon sellers run every product through a proper FBA calculator before committing to inventory. A product that looks profitable at a glance can become a break-even item — or a loss — once fulfillment fees and seasonal storage rates are factored in, especially for bulky or slow-moving inventory. If you’re also selling through Amazon’s own storefront model rather than FBA specifically, our Amazon revenue calculator can help you compare the two approaches.
Before you send your next shipment into an Amazon warehouse, run the numbers with our free Amazon FBA calculator to see your real profit per unit. It’s also worth comparing this against other channels using our Etsy fee calculator if you’re selling across multiple marketplaces.