Amazon FBA Fees Calculator
By Herzel MishelFounder, AgentisLast reviewed
Amazon FBA economics look simple on the surface and get brutal fast. The referral fee is 15 percent of the selling price in most categories. The fulfillment fee depends on size and weight and can run anywhere from 3 to 15 dollars per unit. Storage fees accrue monthly and spike in Q4. Long-term storage fees kick in after 180 days. Returns processing applies to eligible categories. And none of those are the hidden costs: advertising to stay visible in search, the new inbound placement fee, and the referral fee being charged on shipping revenue. This calculator gives you a quick, honest read on per-unit FBA economics. Enter your selling price, referral fee percentage, FBA fulfillment fee, monthly storage fee, product cost, and units per month, to see referral fees, total FBA fees, net per unit, margin percentage, and monthly profit after all Amazon costs.
Inputs
Results
Referral Fee per Unit
$5.25
Total Amazon Fees per Unit
$11.50
Net Profit per Unit
$15.50
Margin %
44.29%
Monthly Profit
$46,500
What the Result Means
Brands that succeed on Amazon FBA typically need a 60 to 70 percent starting gross margin (before FBA fees) just to clear a 15 to 20 percent net margin after the full Amazon tax. A product with a 40 percent pre-FBA gross margin will almost certainly lose money on Amazon once advertising is factored in. The most common failure mode is founders comparing the FBA margin number (before ad spend) to their Shopify direct margin (after everything) and concluding that Amazon is more profitable. It is not. Amazon is a volume channel with a fixed 25 to 35 percent total cost of sale for most mid-market sellers. The right question is not whether Amazon is profitable in isolation, but whether the incremental Amazon volume adds enough contribution to be worth the inventory capital, the operational complexity, and the platform risk. For most DTC brands, Amazon works as a secondary channel at 20 to 35 percent of revenue, rarely as the primary channel.
How It's Calculated
Referral fee per unit is Selling Price multiplied by the Referral Fee Percentage divided by 100. Most Amazon categories charge 15 percent, but grocery charges 8 percent, consumer electronics 8 percent, and jewelry 20 percent; check the current category rate card before trusting the default. Total Amazon fees per unit is the referral fee plus the FBA fulfillment fee plus the FBA storage fee. Net per unit is Selling Price minus Total Amazon Fees minus Product Cost. Margin percentage is Net per Unit divided by Selling Price, expressed as a percentage. Monthly profit is Net per Unit multiplied by Units per Month. This model does not include Amazon PPC advertising spend (which for competitive categories can add 15 to 25 percent of revenue), the inbound placement fee (added in 2024 for sellers who do not split shipments optimally), long-term storage fees (which apply to inventory held over 180 days), or returns processing fees. The true all-in Amazon cost is typically 8 to 12 percentage points higher than what this calculator shows once advertising is included. Use it as the optimistic floor, not the expected case.
The Gap This Calculator Reveals
FBA fees are predictable per-unit economics. The harder margin problem is your non-Amazon channel: the Shopify Plus DTC site where discounting, freight zones, and COGS drift can quietly destroy the margin you are trying to reinvest into Amazon inventory. Agentis does not touch your Amazon listings; it protects the DTC margin that funds them. By checking every Shopify Plus order against a profit floor within 60 seconds and flagging or holding the losers before they ship, it helps the DTC channel deliver the gross profit you budgeted, so you can fund Amazon inventory and advertising without running into a cash wall.
Sources
Frequently Asked Questions
What is the average Amazon FBA fee?
All-in, most mid-market FBA sellers pay 25 to 35 percent of selling price in combined Amazon fees (referral, fulfillment, storage, returns). The referral fee is 15 percent of selling price in most categories, though grocery and consumer electronics charge 8 percent and jewelry 20 percent, so check the current category rate card. Categories with large or heavy products can exceed 40 percent. The fulfillment fee depends on size and weight and runs anywhere from 3 to 15 dollars per unit, which is why bulky products cross the 40 percent line. Add 15 to 25 percent for advertising and the true cost of doing business on Amazon is 40 to 60 percent of revenue. This calculator sums referral, fulfillment, and storage fees per unit and subtracts landed product cost; enter your own price and fees to see where your SKU lands in that band.
Is Amazon FBA profitable for mid-market brands?
Only for products with high enough starting margins (60 to 70 percent pre-FBA) and defensible pricing power. The reason is arithmetic: combined referral, fulfillment, storage, and returns fees run 25 to 35 percent of selling price for most mid-market sellers, and advertising adds another 15 to 25 percent of revenue in competitive categories. A product that starts at 60 to 70 percent gross margin can clear a 15 to 20 percent net margin after that stack; a product at 40 percent pre-FBA margin almost certainly cannot. Commodity products with thin margins almost always lose money on Amazon once advertising is included. The most common mistake is comparing the FBA margin before ad spend to a Shopify direct margin after everything and concluding Amazon is more profitable. Model the math before you scale. This calculator shows the optimistic floor because it excludes PPC; run your SKU through it and then subtract your expected advertising percentage before deciding whether to scale.
What fees does this calculator not include?
Amazon PPC advertising, inbound placement fees, long-term storage fees (180+ days), and returns processing. PPC is the largest omission: in competitive categories, advertising to stay visible in search can add 15 to 25 percent of revenue. The inbound placement fee was added in 2024 for sellers who do not split shipments optimally, and long-term storage applies to inventory held over 180 days. Amazon also charges the referral fee on shipping revenue, which the per-unit model here does not separate out. The calculator includes the referral fee, the FBA fulfillment fee per unit, and the monthly storage fee per unit, and treats the result as the optimistic floor rather than the expected case. Add another 8 to 15 percentage points of revenue to get the realistic all-in cost. Take the margin percentage this tool returns, subtract your actual advertising share of revenue, and use that figure as your working Amazon margin.
Should I prioritize Amazon or Shopify?
For most mid-market DTC brands, Shopify is the margin channel and Amazon is the volume channel. Shopify margins are typically 10 to 20 points higher per order, but Amazon delivers incremental volume and customer acquisition. Amazon carries a fixed 25 to 35 percent total cost of sale for most mid-market sellers before advertising, which is the structural reason its per-order margin trails Shopify. The right question is not whether Amazon is profitable in isolation, but whether the incremental volume adds enough contribution to justify the inventory capital, operational complexity, and platform risk. For most DTC brands, Amazon works as a secondary channel at 20 to 35 percent of revenue, rarely as the primary one. Run both with clear contribution margin targets per channel. Use this calculator for the Amazon side and the Shopify Plus fees calculator for the other, then compare net per unit across both.
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