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Calculate your Amazon FBA fees, referral fees, storage costs, and net profit per unit instantly.
Your net profit on each Amazon FBA unit is calculated by subtracting the referral fee, FBA fulfillment fee, monthly storage fee, and your product cost from the selling price. Size tier classification determines the fulfillment fee, while your product category sets the referral fee percentage.
Net Profit = Selling Price - Referral Fee - FBA Fee - Storage Fee - Product CostSelling on Amazon through Fulfillment by Amazon can be highly profitable, but only if you understand the full cost structure before listing your products. FBA fees include referral fees, fulfillment fees, monthly storage fees, and potential long-term storage surcharges. Our free Amazon FBA Calculator breaks down every cost so you can see exactly how much you keep on each sale. Enter your product details, dimensions, weight, and category to get an instant profit estimate with a visual breakdown of where your revenue goes.
Amazon charges three main fees on every FBA sale. The referral fee is a percentage of the selling price that varies by category, typically fifteen percent for most categories and eight percent for personal computers and consumer electronics. The FBA fulfillment fee covers picking, packing, and shipping your product to the customer, and it depends on the item's size tier and weight. Small standard-size items under six ounces start at around three dollars and twenty-two cents, while large oversize items can cost significantly more. Finally, monthly inventory storage fees are charged per cubic foot of warehouse space your products occupy, with rates increasing during the peak holiday season from October through December.
Start by optimizing your product packaging to reduce dimensions and weight, since even small reductions can drop your item into a lower size tier and save dollars per unit on fulfillment fees. Monitor your inventory levels closely to avoid long-term storage fees, which Amazon charges on units stored for more than 365 days. Use Amazon's Inventory Performance Index to identify slow-moving stock and run promotions to clear it before surcharges kick in. Negotiate better landed costs with your suppliers as your sales volume increases. Consider enrolling in the Small and Light program for items priced under twelve dollars, which offers reduced fulfillment fees for qualifying lightweight products.
Fulfillment by Amazon handles storage, packing, shipping, and customer service, making it ideal for sellers who want a hands-off approach and access to Prime eligibility. However, FBA fees can eat into margins on low-priced or heavy items. Fulfillment by Merchant lets you control shipping costs and logistics, which can be more profitable for oversized products, slow-moving inventory, or items with thin margins. Many successful Amazon sellers use a hybrid approach, fulfilling high-volume fast-selling products through FBA for the Prime badge and conversion boost, while handling niche or heavy items through FBM to protect margins. Use this calculator to model your FBA costs and compare them against your own fulfillment expenses to determine the best strategy for each product in your catalog.