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 come from the live USITC schedule. The worked example below was generated from it on 13 September 2026. Amazon fees reflect published 2026 rate cards.
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 every duty layer in force stacks on the FOB value: MFN Base Duty, Section 232 (National Security), Section 301 (Forced Labor) and Section 301 (China lists)), 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.
Take the 500ml stainless steel vacuum insulated flask from China in the worked example below. Counting only the factory price and the referral fee, its margin looks like 56%. With freight, MFN Base Duty and Section 301 (Forced Labor), customs brokerage, FBA fulfillment and storage, the true margin is 33.0% (rates as of 24 July 2026). Decisions made on the first number are off by 23 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 Base Duty | ||||
| Section 232 (National Security) | ||||
| Section 301 (Forced Labor) | ||||
| Section 301 (China lists) | ||||
| 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 worked example, produced by this calculator from the live US tariff schedule on 13 September 2026: a 500ml stainless steel vacuum insulated flask (HTS 9617.00.10) sourced from China, selling at $34.99 on Amazon. This is the kind of product where sellers commonly use the “3X rule” and assume they're making good money. The 3X rule was designed for domestic sourcing: retail arbitrage, wholesale. It ignores freight, duties and customs brokerage.
FOB cost
What you pay the factory, before shipping
Freight to Amazon
Allocated per unit across a 500-unit shipment
US customs (China origin)
Duty layers charged on the FOB value, plus the broker who files the entry
Amazon fees
Referral, fulfillment, surcharge and storage
True margin
vs. 56% ($19.74) counting only FOB and the referral fee
Duty rates as of 24 July 2026. Freight and Amazon fees come from the calculator's own rate tables.
That 56% margin was actually 33.0%. The gap is $8.18 per unit in costs the seller never calculated. Across a 500-unit shipment, that's $4,090.07 of invisible cost.
At 56% margin, almost any product looks profitable. At 33.0%, you need to ask harder questions. Can you negotiate a lower FOB cost? Is your tariff code the right one? Would a different sourcing country change which duty layers apply?
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 from another country can carry a different set of duty layers, and even with a higher FOB cost 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
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