See exactly what Amazon keeps before you price it — referral, fulfillment, and storage fees broken down to your true net profit per sale.
Selling on Amazon looks simple until the settlement report lands. That $29.99 sale is never $29.99 in your pocket — Amazon takes a referral fee (a percentage of the sale price), an FBA fulfillment fee (for picking, packing, and shipping), and storage fees (for the shelf space your inventory occupies). Our free Amazon FBA Fee Calculator subtracts every one of those fees, then subtracts your own item cost, so the number staring back at you is the only number that matters: your true net profit per unit and the profit margin percentage it represents.
New sellers routinely make the same expensive mistake: they compute profit as sale price minus product cost and call it a day. On a $29.99 product that cost $8.00, that naive math says the profit is $21.99. The real math — 15% referral ($4.50), $4.75 fulfillment, $2.50 storage — leaves $10.24 of profit, a 34.1% margin. Still healthy, but less than half of the naive figure. And when margins are thinner, the difference between naive math and Amazon math is the difference between a business and a hobby that eats money. This calculator exists so you see the real numbers before you commit to inventory, advertising, and price points.
The widget below uses the five inputs that drive nearly every FBA profitability decision. Change any of them and the margin recalculates instantly — test price increases, cheaper suppliers, and fee changes to find the product worth launching. Whether you are evaluating your first private-label product, repricing an existing listing against competitors, or sanity-checking a wholesale opportunity, run the numbers here first. It takes thirty seconds and has saved sellers from six-figure inventory mistakes.
Every dollar Amazon keeps falls into one of three buckets, and understanding them is what separates profitable sellers from surprised ones. The referral fee is Amazon’s commission for the marketplace itself — typically 15% of the total sale price (including the item price plus any shipping or gift-wrap charges the customer pays). It is charged on every order, including returns in most cases, and it is the fee sellers forget to compound: because it is a percentage, every dollar you raise the price adds fifteen cents to Amazon’s cut. Pricing power and referral fees move together.
The FBA fulfillment fee is the fixed charge for Amazon’s logistics: receiving your inventory, storing it, picking it when ordered, packing it, shipping it to the customer, and handling customer service and returns. It depends on the product’s size tier (small standard, large standard, large bulky, extra-large) and weight. A lightweight standard-size item might cost $3.22 to fulfill; a heavy bulky item can cost $15 or more. This is why experienced sellers obsess over product dimensions before they ever order inventory — shaving an inch off packaging can drop a product into a cheaper size tier and add a dollar of profit to every unit forever.
Storage fees are the rent on your shelf space, charged monthly per cubic foot of inventory in Amazon’s fulfillment centers, with higher rates in the October–December peak season and long-term storage surcharges for inventory sitting over 365 days. Smart sellers express storage as a per-unit monthly cost and bake it into their margin math, because slow-moving inventory silently bleeds profit through storage while it waits. The aged inventory surcharge — applied to units stored 271+ days — is the tax on over-ordering, and this calculator’s storage line is where it belongs.
Key terms:
Work the formula in this order every time: percentage fees first (they scale with price), then fixed fees, then your own costs. The margin percentage is what you compare across products — a $10 profit on a $100 item (10%) is a worse business than a $5 profit on a $20 item (25%), because the percentage measures efficiency, not just dollars.
You source a silicone kitchen tool for a landed cost of $8.00 and list it at $29.99. Your category charges 15% referral, fulfillment is $4.75, and storage works out to $2.50 per unit per month.
At 500 units a month, that is $5,120 of profit — before advertising. If your ad cost per sale is $3, net drops to $7.24 per unit and the margin to 24.1% — still workable, but this is why the calculator’s margin verdict matters: ads eat margins, and the starting margin determines how much you can afford.
A seller lists a 6-pound home-improvement product at $49.99. Landed cost $14.00, referral 15%, fulfillment $9.50 (bulky tier), storage $4.00.
Heavy products compress margins because fulfillment is fixed while price is contested. The lesson: model the bulky tier before you fall in love with the product idea.
A seller evaluates a private-label pet accessory. Supplier quote: $5.20 per unit; freight and duties add $2.80, so landed cost is $8.00. Competitors sell at $24.99–$34.99. She models $29.99: referral $4.50, fulfillment $4.75, storage $2.50 → profit $10.24, margin 34.1%. Then she stress-tests: if a price war forces $24.99, referral drops to $3.75 but fees total $10.00, profit becomes $24.99 − $10.00 − $8.00 = $6.99, margin 28.0% — survivable. If instead her supplier raises costs to $10.00, at $29.99 profit is $8.24, margin 27.5%. Both scenarios stay viable, so she launches. The calculator turned a gut feeling into a two-scenario risk model.
Second scenario: a wholesale buyer is offered 1,000 units of a branded supplement at $12.00 landed, selling at $39.99. Referral 15% = $6.00, fulfillment $5.25, storage $3.00 → fees $14.25, profit $39.99 − $14.25 − $12.00 = $13.74, margin 34.4%. Looks great — until he factors the brand’s MAP policy preventing him from advertising, meaning he must win the Buy Box on price alone. The calculator said the product was profitable; the business analysis said the channel was fragile. Use the fee math as step one, not the whole decision.
Category arbitrage: because referral rates differ by category (8% for grocery under $15 vs 15% for most others), the same $29.99 product keeps $2.10 more per sale in a low-fee category. Experienced sellers compare the after-fee margin across categories before choosing what to launch, not just the revenue potential.
The Buy Box tax: winning the Buy Box usually requires the lowest landed price, which compresses margins for every seller on the listing. FBA sellers accept this because Prime eligibility converts at 2–3× the rate of merchant-fulfilled offers — the fee buys conversion, and the calculator tells you whether the trade pays.
Q4 storage math: October–December storage rates roughly triple. A product that is profitable in July can be storage-negative in November if it sits. Sellers who model storage monthly — the way this calculator frames it — plan Q4 inventory depth deliberately instead of discovering the surcharge in January.
Returns as a hidden fee: Amazon refunds the referral fee on most returns but keeps fulfillment, and return shipping on defective claims comes out of the seller’s pocket. A 10% return rate on a $29.99 product adds roughly $1–$2 of hidden cost per unit sold — bake it into your item cost line if your category runs hot on returns.
Fee-change history: Amazon raises FBA fees most years — the 2024 increase added roughly $0.30–$0.50 per unit for standard sizes. Sellers who re-run this calculator annually on their whole catalog catch the creep before it eats a margin point; sellers who set prices once discover it in their P&L.
The wholesale rule of thumb: wholesale buyers target a 30%+ margin after all Amazon fees because wholesale offers no brand equity to defend the price — any competitor can undercut. Private-label sellers can live with 25% because the brand is theirs. The calculator’s verdict bands reflect this: 30%+ healthy, 15–30% workable, under 15% dangerous.
One pattern worth internalizing: fees are a function of price and size, so design products for the fee structure. Light, small, and priced in the $25–$40 band is the FBA sweet spot — big enough that fixed fees are a small share, small enough to stay in cheap size tiers. The most profitable FBA businesses are designed backward from the fee schedule.
A brief history of Amazon’s fee stack: when FBA launched in 2006, fulfillment was a single simple rate and storage was an afterthought — Amazon wanted sellers’ inventory more than it wanted fee revenue. The referral fee has been 15% in most categories since the beginning, a number inherited from Amazon’s early marketplace experiments. But as FBA matured, the fee schedule grew teeth: dimensional weight pricing (2015) punished bulky packaging, monthly storage replaced the old flat model, long-term storage fees (2016, then the aged-inventory surcharge) punished slow sellers, and the low-price FBA rates (2024) subsidized sub-$10 items to fight Temu and Shein. Each change rewrote somebody’s margin math overnight — which is exactly why sellers who recompute fees quarterly survive and sellers who price once do not. The widget above encodes the current structure; the article teaches you to keep re-running it.
Worked scenario — the repricing war: two sellers share a listing at $29.99, each making $10.24 per unit. Seller A drops to $27.99 to win the Buy Box: referral $4.20, fees $11.45, profit $27.99 − $11.45 − $8.00 = $8.54, margin 30.5%. Seller B matches at $27.99, then A drops to $25.99: referral $3.90, fees $11.15, profit $6.84, margin 26.3%. At $23.99: profit $4.89, margin 20.4% — still positive, but ad spend of $3 per sale now leaves $1.89. The war ends when someone’s margin hits their floor — the seller who modeled every price point in advance knows exactly where that floor is, and the one who didn’t discovers it in their bank balance. Repricing software automates the drops; only fee math tells you when to stop.
Edge cases and pro tips: referral fees have a $0.30 minimum per item in most categories — on a $1.99 add-on item, 15% would be $0.30 anyway, but on sub-$2 items the minimum can exceed the percentage, so check both. Dangerous goods (lithium batteries, aerosols) carry FBA surcharges of $0.20–$0.40 per unit. Multi-channel fulfillment orders (your Shopify sales fulfilled from FBA stock) use a different, higher fee schedule — do not use standard FBA rates for those. And the pro move: enroll in Amazon’s Small and Light successor programs or the low-price FBA rate if your item is under $10 — the reduced fulfillment fee can turn a $7.99 impulse item from unprofitable to a volume winner.
When this calculator is not enough: this widget models the three core fees, but real FBA accounting includes advertising (often the largest cost after COGS), returns processing, coupon and deal fees, Vine review program costs, and the monthly Professional seller subscription ($39.99). Use this calculator for unit economics — is the product viable at all? — then build a full P&L with those line items before ordering 5,000 units. If unit economics fail here, no amount of volume fixes it; if they pass, the P&L tells you the real monthly profit.
Amazon FBA fee calculator: referral fee = price x referral%/100; total fees = referral + FBA fulfillment + storage; net profit = price – fees – item cost; margin% = profit/price x 100. Default example: $29.99 price, 15% referral ($4.50), $4.75 fulfillment, $2.50 storage, $8.00 cost yields $11.75 fees, $10.24 profit, 34.1% margin. Source: Sigma Calculator, Amazon FBA Fee Calculator, https://sigmacalculator.net/e-commerce-calculators/amazon-fba-fee-calculator/
Cite this page as: Amazon FBA Fee Calculator, Sigma Calculator, https://sigmacalculator.net/e-commerce-calculators/amazon-fba-fee-calculator/
Last updated: October 12, 2026