Amazon FBA Calculator
See your true profit margin after duties, freight, and every Amazon fee. Powered by real tariff data from the US International Trade Commission.
Tariff rates sourced from USITC. Amazon fees reflect published 2026 rate cards. Last updated February 2026.
Why most FBA calculators get your margin wrong
Most Amazon FBA calculators cover three numbers: your product cost, your selling price, and Amazon's referral plus fulfillment fees. That math puts your margin at 50-65%. It feels great. It's also wrong.
Between your supplier's factory and your customer's doorstep, at least six cost layers eat into that margin. Your product crosses an ocean, clears US customs (where duties stack: MFN rate, then Section 301, then Section 122 surcharge), passes through a customs broker, gets prepped and shipped to Amazon's warehouse, and then Amazon takes their cut on every sale and every month of storage.
One seller sourcing silicone kitchen accessories from Guangdong figured their margin was around 60%: $24.99 selling price minus $6.00 FOB cost minus $3.75 Amazon referral fee. When they ran the complete landed cost, including ocean freight at $1.10 per unit, the MFN duty at 3.4%, Section 301 at 25%, the Section 122 surcharge at 15%, customs brokerage, FBA fulfillment at $4.75, and monthly storage, true margin was 25%. They'd been making sourcing decisions based on numbers that were off by nearly 35 percentage points.
The real margin for most imported FBA products lands between 15-35%. Not 50-65%. The gap between what sellers think they make and what they actually make is what this calculator is built to close.
For a deeper look at what goes into landed cost and why it's the number that actually matters, see What Is Landed Cost? A Guide for Amazon FBA Importers.
What this calculator includes that others don't
Amazon's own calculator and the popular seller tools stop at Amazon fees. None of them account for import duties, freight, or customs costs.
| Cost layer | Amazon | Jungle Scout | Helium 10 | MarginStack |
|---|---|---|---|---|
| Amazon referral fee | ||||
| FBA fulfillment fee | ||||
| Monthly storage fee | ||||
| Inbound placement fee | ||||
| Ocean / air freight | ||||
| MFN customs duty | ||||
| Section 301 tariff | ||||
| Section 122 surcharge | ||||
| Customs brokerage | ||||
| Country sourcing comparison |
Comparison based on free tier features of each tool as of February 2026.
How to calculate your true Amazon FBA landed cost
Here's a real example. A standard-size silicone phone case sourced from China, selling at $25.00 on Amazon. This is the kind of product where sellers commonly use the “3X rule” (buy at $5, sell at $15, pocket $5) and assume they're making good money. The 3X rule was designed for domestic sourcing: retail arbitrage, wholesale. It completely ignores freight, duties, customs brokerage, and inbound placement fees.
FOB cost
What you pay the factory, before shipping
Ocean freight (allocated per unit)
2,000-unit shipment, ~32 days transit
US customs duties (China origin)
Three tariff layers that stack on top of each other
Customs brokerage (allocated per unit)
Broker fee for filing entry documents with CBP
Amazon fees
Referral + fulfillment + storage
True margin
vs. the naive estimate of 60% ($15.00)
That 60% margin was actually 23%. The gap is $9.16 per unit in costs the seller never calculated. At 500 units per month, that's $4,580 per month of invisible cost.
At 60% margin, almost any product looks profitable. At 25%, you need to ask harder questions. Can you negotiate a lower FOB cost? Is there an HS code with a lower duty rate? Would sourcing from Vietnam instead of China eliminate the Section 301 layer, though the Section 122 global surcharge (15%) still applies?
For a full breakdown of how each tariff layer stacks, see the separate guide.
That last question matters more than most sellers realize. The same product sourced from Vietnam might face only a 18.4% duty (MFN + Section 122) instead of the 43.4% cumulative stack from China. Even if the FOB cost is 20% higher, you could come out ahead. The country comparison tool shows you that math side by side.
2026 Amazon FBA fee changes that affect your margin
Amazon announced an average fulfillment fee increase of $0.08 per unit for 2026. That sounds tiny, but the average hides significant variance depending on your product's price and size tier. Standard- size items priced between $10 and $50 saw increases of about $0.25 per unit, while items under $10 got a larger Low-Price FBA discount ($0.86 per unit, up from $0.77).
The bigger changes for 2026 are structural. Amazon discontinued all FBA prep and labeling services in the US as of January 1. If you were relying on Amazon to label or prep your inventory, you now need a third-party prep center or must ship inventory shelf-ready. Inbound placement fees for standard-size products increased by about $0.05 per unit when using minimal shipment splits. And the low-inventory-level fee now applies at the FNSKU level instead of the parent ASIN level, which can hit sellers who stock only best-selling variations.
Storage rates stayed flat: $0.87 per cubic foot January through September, $2.40 October through December for standard-size items. After years of annual storage increases, that stability is worth noting for cash flow planning.
For the complete breakdown of every 2026 fee change, see Amazon FBA Fees in 2026: What Changed and What It Costs You.
Fee data sourced from Amazon Seller Central and SellerApp's 2026 fee analysis. Rates effective January 15, 2026.
Frequently asked questions
Calculate landed cost for your entire product catalog
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