Calculate referral fees, FBA fulfillment costs, storage, and net profit margin for every product.
Referral + FBA fulfillment + storage · 2026
FBA = standard-size non-apparel. Storage at $0.87/cu ft avg.
Amazon FBA represents one of the more complex fee structures among major selling platforms, layering referral fees, fulfillment charges, and storage costs in ways that aren't always intuitive until you've sold through a full inventory cycle. The trade-off for this complexity is access to Prime-eligible shipping and Amazon's logistics network — a combination that can meaningfully boost conversion rates for the right products, provided the fees are properly accounted for in your pricing from day one.
Amazon's referral fee ranges from as low as 6% for computers up to 20% for jewelry, with most general merchandise sitting at 15%. This single variable can determine whether a product is genuinely profitable on the platform. A $40 item in the Computers category pays $2.40 in referral fees; the identical price point in the Jewelry category pays $8.00 — a $5.60 difference that, multiplied across hundreds of units, can be the entire difference between a viable product line and one that quietly loses money every month.
Consider a 10-ounce kitchen gadget priced at $25, falling under Home & Kitchen (12% referral fee). The referral fee comes to $3.00. Based on its weight, it falls into the 8–16oz standard size tier, incurring a $4.75 FBA fulfillment fee. Add roughly $0.76 in average monthly storage costs, and total Amazon fees reach approximately $8.51 — barely over a third of the sale price. If your product cost (manufacturing plus shipping to Amazon's warehouse) is $7, your remaining profit is roughly $9.49, a healthy 38% margin once all platform costs are accounted for.
Two storage-related charges catch many new FBA sellers off guard. First, storage fees nearly triple during the October–December peak season (from $0.87 to $2.40 per cubic foot for standard items), reflecting the warehouse space premium during the holiday shopping surge. Second, inventory that sits unsold for more than 365 days incurs a long-term storage surcharge of up to $6.90 per cubic foot — a penalty designed to discourage sellers from using Amazon's warehouses as long-term storage for slow-moving stock. Both of these costs are entirely avoidable with proactive inventory management, but they can significantly erode margins for sellers who don't actively monitor their sell-through rate.
The formula that matters most for any FBA seller is straightforward in concept but easy to get wrong in practice: Profit = Sale Price − Referral Fee − FBA Fulfillment Fee − Storage Fee − Product Cost − Inbound Shipping. Many new sellers calculate margin using only product cost against sale price, entirely omitting Amazon's fees from the equation — a mistake that can make an apparently profitable product line actually break even or lose money once the full fee structure is applied. Our calculator above handles this complete calculation automatically, but understanding each component helps you make sourcing and pricing decisions before you've committed to inventory.
For most product categories, the Prime badge and associated trust significantly increase conversion rates compared to standalone e-commerce, often enough to offset Amazon's higher fees compared to platforms like Shopify or Etsy. The calculation tends to favor FBA most clearly for products with reasonable margins and consistent demand — thin-margin products or highly seasonal items deserve more careful modeling before committing to FBA's fee structure at scale.
| Category | Referral Fee | Min Fee |
|---|---|---|
| Computers | 6% | $0.30 |
| Consumer Electronics | 8% | $0.30 |
| Home & Kitchen | 12% | $0.30 |
| Most categories | 15% | $0.30 |
| Clothing & Accessories | 17% | $0.30 |
| Jewelry | 20% | $0.30 |
| Size Tier | Weight | FBA Fee |
|---|---|---|
| Small standard | ≤4 oz | $3.22 |
| Standard | 4–8 oz | $3.86 |
| Standard | 8–16 oz | $4.75 |
| Standard | 16–32 oz | $6.21 |