How to Use the Amazon FBA
Amazon FBA can be incredibly lucrative — but the fee structure is also notoriously complex. Between referral fees (8–15%+), FBA fulfillment fees, monthly storage fees, and PPC advertising, your real profit per unit can be dramatically different from your gross margin. This Amazon FBA Profit Calculator accounts for every fee Amazon charges and shows you your true net margin and ROI before you invest in inventory.
Step-by-Step Guide
- 1
Enter your selling price — your listing price on Amazon.
- 2
Enter your product cost (COGS) — what you pay your supplier, including inbound shipping to Amazon.
- 3
Add the FBA fulfillment fee — find this in Amazon's FBA Revenue Calculator or Seller Central based on product dimensions and weight.
- 4
Set the referral fee % — typically 15% for most categories (8% for electronics, up to 45% for some accessories).
- 5
Add any monthly storage fees allocated per unit.
- 6
Enter your PPC spend per unit — Amazon Sponsored Products spend ÷ units sold.
- 7
Add prep center, labeling, or other per-unit costs.
- 8
Review net margin, ROI, break-even ROAS, and total profit.
Amazon FBA Formula
Net Profit = Selling Price − Product Cost − FBA Fee − Referral Fee − Storage Fee − PPC Per Unit − Other Costs Referral Fee = Selling Price × Referral Fee % Break-Even ROAS = Total Cost Per Unit ÷ PPC Spend Per Unit
Worked Example
Selling price: $34.99. Product cost: $8. FBA fee: $3.22. Referral fee: 15% = $5.25. Storage: $0.50. PPC per unit: $4. Total Costs = $8 + $3.22 + $5.25 + $0.50 + $4 = $20.97 Net Profit = $34.99 − $20.97 = $14.02 Net Margin = ($14.02 ÷ $34.99) × 100 = 40.1% ROI = ($14.02 ÷ $20.97) × 100 = 66.9%
Understanding your result
Calculator results depend entirely on the information entered. For the most useful estimate, use current and accurate figures and include all costs that apply to your specific situation.
Frequently Asked Questions
What are typical Amazon FBA fees?
FBA fees consist of fulfillment fees (size/weight-based, roughly $3–$7 for standard items), referral fees (8–15% of selling price depending on category), and storage fees ($0.75–$2.40/cubic foot/month depending on season).
What is a good profit margin for Amazon FBA?
A net margin of 20–30%+ is healthy for Amazon FBA. Many successful sellers target 30–50% margins to buffer against fee increases, storage costs, and PPC competition. Margins below 15% leave little room for error.
How do I find my FBA fulfillment fee?
Use Amazon's FBA Revenue Calculator (available free in Seller Central) or the FBA Fee Preview report. Fees are based on your product's weight and dimensions in its shipping packaging.
Should I include PPC in my FBA profit calculation?
Yes — PPC is a real cost of selling on Amazon. Divide your total monthly Sponsored Products spend by units sold in that period to get your PPC cost per unit. Many sellers forget this and overestimate their true margin.
What is break-even ROAS for Amazon PPC?
Amazon PPC break-even ROAS = Total Cost Per Unit (excluding PPC) ÷ Selling Price. It tells you the minimum revenue your ads must generate per dollar spent to avoid losing money on PPC-driven sales.