Calculate Amazon FBA fees including fulfillment, monthly storage, referral fees, and net profit per unit for any product category and size tier.
Selling on Amazon via Fulfillment by Amazon (FBA) means Amazon picks, packs, and ships your products, but the convenience comes at a cost. FBA fees consist of three main components: a fulfillment fee based on the size and weight of your item, a monthly inventory storage fee based on volume occupied in Amazon's warehouses, and a referral fee that is a percentage of your total sale price.
This calculator breaks down all three fee types for a single unit so you can see exactly how much Amazon takes from each sale. Enter your product's sale price, cost, weight, dimensions, and category to get an accurate estimate of your FBA fees and net profit per unit.
Understanding FBA fees is essential for setting profitable prices. Many new sellers underestimate the total cost of FBA, leading to razor-thin margins or losses. Use this calculator before sourcing any product to ensure it meets your profit targets.
FBA fees vary by product size, weight, and category, making them hard to estimate manually. This calculator lets you model different scenarios instantly — change the sale price, try a different category, or see how dimensions affect your fulfillment fee. It is an essential tool for product research, pricing decisions, and profit forecasting.
Referral Fee = Sale Price × Category Rate (8‒15%) Fulfillment Fee = Based on size tier and weight (e.g., $3.22 small standard, $5.40+ large standard) Monthly Storage Fee = (Length × Width × Height / 1728) × $0.87 (Jan–Sep) or $2.40 (Oct–Dec) Total FBA Fees = Referral Fee + Fulfillment Fee + Monthly Storage Fee Net Profit = Sale Price − Cost − Total FBA Fees
Result: Net Profit: $13.83 per unit | Total Fees: $8.16
A product selling at $29.99 in the Home & Kitchen category (15% referral) with $8 cost and 1.2 lb weight: Referral fee = $29.99 × 15% = $4.50. Fulfillment fee = $3.49 (small standard). Storage fee = ~$0.17/month. Total fees = $8.16. Net profit = $29.99 − $8.00 − $8.16 = $13.83, or a 46.1% margin.
The FBA fee structure is designed to cover Amazon's costs for warehousing and shipping your products. The referral fee is Amazon's commission, similar to what any marketplace charges. The fulfillment fee covers the labor and shipping cost of picking, packing, and delivering the item to the customer. The storage fee covers the warehouse space your inventory occupies.
One of the most impactful decisions FBA sellers make is product sizing. The jump from Small Standard to Large Standard can add $2–$3 per unit in fulfillment fees. Sellers who can redesign packaging to fit within smaller dimensions often see significant profit improvements. Consider collapsible designs, vacuum-sealed packaging, or multi-packs that optimize the cubic space.
Smart sellers ship inventory to Amazon just before peak demand and remove slow sellers before October to avoid Q4 storage surcharges. Tools like Inventory Performance Index (IPI) scoring help track and optimize how efficiently you use Amazon's warehouse space.
FBA fees consist of three parts: a referral fee (percentage of sale price, varies by category), a fulfillment fee (based on size and weight of item), and a monthly storage fee (based on cubic feet of warehouse space occupied). Together, these typically total 25–40% of the sale price.
Amazon classifies products into tiers: Small Standard (up to 15×12×0.75 in, ≤12 oz), Large Standard (up to 18×14×8 in, ≤20 lb), Small Oversize, Medium Oversize, Large Oversize, and Special Oversize. Each tier has a different fulfillment fee. Keeping your product in a smaller tier saves significant money.
Most successful FBA sellers target a net margin of 20–30% after all fees. Products with margins below 15% are risky because small price changes or fee increases can wipe out profits. Higher-priced items ($25+) tend to have healthier margins.
Yes. Monthly storage fees increase during Q4 (October–December) from about $0.87/cubic foot to $2.40/cubic foot. Amazon also adjusts fulfillment fees annually, usually in January or February. Always check the latest Amazon fee schedule.
Beyond the three core fees, sellers may incur long-term storage fees (for inventory over 181 days), removal/disposal fees, labeling fees, and unplanned service fees. Keeping inventory lean and properly prepared minimizes these extras.
Choose lightweight, compact products to stay in the Small Standard tier. Optimize packaging to reduce dimensional weight. Avoid slow-moving inventory to prevent long-term storage fees. Bundle low-cost items to increase average sale price relative to fixed per-unit fees.