Inputs to review
- Selling price and supplier cost
- Referral fee percentage
- Unit weight and packed dimensions
- FBM shipping and packing costs
- Optional FBA fee override
What the estimate shows
- Profit per unit for FBA and FBM
- ROI and margin for each method
- Which method leaves more profit
How to read the comparison
The FBA column uses a planning estimate of the Amazon fulfillment fee from your size and weight, plus inbound shipping, storage, and returns. The FBM column uses the shipping and packing cost you enter. If you already know your FBA fee from Amazon's Revenue Calculator, type it in the override field.
FBM often wins for large, heavy, or slow-selling items, and FBA often wins for small, fast-moving ones. Your own carrier rates decide it, so enter real numbers rather than defaults.
Limits of a web estimate
This is a planning tool, not an official quote. Fee schedules change, category fees vary, and the calculator does not include advertising or prep costs unless you add them to your supplier cost. Confirm the final fee in Amazon's tools before buying.
Check these before trusting the FBA vs FBM result
Measure the packed product, not the bare item, because size tier and billing weight drive the FBA fee. Then replace the default FBM shipping with a real quote from your carrier for a typical destination.
Run the comparison again with a lower selling price. A method that only wins at the highest price is fragile, and the lower-price result shows how much room you have.
- Use packed size and weight, not product size.
- Use a real carrier quote for FBM.
- Re-run at a lower selling price.
Common questions
Frequently asked questions
Is FBA or FBM more profitable?
It depends on the product. Compare profit per unit using your real shipping, packing, and storage costs, as this calculator does.
Does this calculator use real Amazon fees?
It uses a planning estimate from the size and weight you enter. You can override it with the exact FBA fee from Amazon.
Do I need an account?
No. It is free and runs in your browser.
Ready to check a listing?
Put the assumptions to work.
Bring the visible listing facts and your own costs into a product audit before you commit to inventory.