Amazon ROI Calculator
Compare FBA vs FBM side-by-side, accounting for referral, storage, returns, and PPC.
Product & Sourcing
Fulfillment Details
Marketing & Reserves
Amazon ROI comparison
Comparing FBA vs FBM channels...
Amazon FBA Results
Net Profit:
$0.00
FBA Margin: 0%
FBA ROI: 0%
Amazon FBM Results
Net Profit:
$0.00
FBM Margin: 0%
FBM ROI: 0%
Side-by-Side Comparison
| Metric | FBA | FBM |
|---|---|---|
| Gross Price | $0.00 | $0.00 |
| Referral Fee | $0.00 | $0.00 |
| Fulfillment Fee | $0.00 | N/A |
| Storage Fee | $0.00 | N/A |
| PPC ad spend (ACOS) | $0.00 | $0.00 |
| Returns reserve | $0.00 | $0.00 |
| COGS + Ship in/out | $0.00 | $0.00 |
Amazon FBA vs FBM ROI Calculator
Compare referral fees, standard fulfillment, storage costs, and return ratios to calculate Amazon ROI.
Amazon Selling Economics: FBA vs FBM
Selling on Amazon offers massive reach, but requires navigating Amazon's complex fee matrix. Sellers must choose between Fulfillment by Amazon (FBA) and Fulfillment by Merchant (FBM). FBA charges handling, picking, and cubic storage fees, while FBM shifts fulfillment costs directly to your team or third-party logistics (3PL) providers. To make the right decision, you must compare the two side-by-side using real-world item dimensions and referral rates.
FBA vs FBM Profit Formulas:
- Amazon Referral Fee: Typically $8\%$ to $15\%$ of the product's total selling price, depending on the category.
- FBA Fulfillment Fee: Set fee based on unit size weight tier (Standard, Large Standard, Oversize).
- FBA Storage Fee: Calculated per cubic foot, with peak surcharges from October to December.
- FBM Fulfillment Cost: Average packaging material + actual shipping carrier fee.
- Net ROI: $\text{ROI} = \left(\frac{\text{Net Profit}}{\text{COGS} + \text{Amazon Fees} + \text{Inbound Shipping}}\right) \times 100$
Key Takeaways
- FBA is usually more cost-effective for small, lightweight, fast-turning items.
- Monthly Amazon storage fees quadruple during the holiday peak season (October - December).
- Do not forget the Professional Seller Subscription fee ($39.99/mo) in your broad overhead budget.