The numbers-first guide to launching an FBA business — what fees to expect, what margins are realistic, and how to model profitability before placing your first inventory order.
The #1 mistake new FBA sellers make: falling in love with a product idea, ordering 500 units, then discovering the margins don't work after Amazon takes its fees. The FBA fee structure (referral fee + fulfillment fee + storage) typically consumes 30-40% of your sale price before COGS. Model this before you spend a dollar.
Enter your product price, COGS, and category to see exact FBA net profit per unit.
Amazon FBA Calculator →Successful FBA products in 2025 share a predictable profile. Before committing to any product, verify all five criteria:
Amazon FBA fees come in layers that most guides don't fully explain upfront. For a $35 product in the general merchandise category:
Total Amazon costs: roughly $11.61-$14.61. If your COGS is $10, you need to price at $35 minimum just to break even — before profit. This is why the $20-$60 price band with $7-$15 COGS is the reliable profit zone.
The minimum viable FBA starting budget is $3,000-$5,000. This covers: initial inventory order of 200-300 units ($1,500-$4,000 depending on product), Amazon Professional seller account ($39.99/month), product photography ($200-$500), UPC barcodes ($30), and first 30-60 days of PPC ($300-$600). Under $2,000, product options are severely constrained and PPC budget is inadequate to launch properly.
Plan for your cash to be tied up in inventory for 60-90 days before you see meaningful return. Many sellers underestimate this cash cycle and run out of working capital before the business can breathe.
Amazon's algorithm rewards products with reviews. New listings with 0 reviews rarely appear above page 3, even with heavy PPC. Your launch goal is 15-30 honest reviews in the first 30-45 days. The legitimate strategy: use Amazon's Request a Review button (automated via tools like Jungle Scout), and participate in the Vine program (invite-only, provides reviews from vetted reviewers for a fee of $200). Do not buy fake reviews — Amazon's detection is sophisticated and account bans are permanent.
Every FBA business has a unit economics equation. If that equation doesn't produce 20%+ net margin at your target price point, scaling the business just scales the losses. The calculator tells you this in 30 seconds. The market tells you after 6 months and $8,000 in inventory.
Run the numbers on 10 product ideas. The ones with viable margins in your niche category move forward to research. The ones that don't — no matter how interesting — get filtered before you invest time or money.