Amazon Margin Calculator
FBA fees and margin.
Loading tool…
About Amazon Margin Calculator
The Amazon Margin Calculator helps FBA and third-party sellers work out the real profit on a product. Enter your sale price, product cost, Amazon referral fee percentage, FBA or fulfilment fee, and any other costs, and it instantly shows your net profit per unit alongside profit margin, ROI, and total fees.
It's completely free with no sign-up. Everything runs entirely in your browser, so nothing you type is ever uploaded or stored. Use it to sanity-check pricing, compare suppliers, or decide whether a product is worth listing before you commit.
Frequently asked questions
- How is Amazon profit margin calculated?
- Net profit is your sale price minus product cost minus total fees, where fees are the referral fee (sale price times the referral percentage) plus the FBA/fulfilment fee plus any other costs. Margin is net profit divided by sale price, and ROI is net profit divided by product cost.
- What referral fee percentage should I use?
- Amazon referral fees vary by category and are most commonly around 15%, which is the default here. Some categories are 8% to 17%, so check the referral rate for your specific product category for an exact figure.
- Does this include FBA fees?
- Yes. There's a dedicated FBA/fulfilment fee field (defaulting to $3.50) so you can add Amazon's pick, pack, and ship charge. Use the 'other costs' field for extras like shipping to Amazon, storage, or advertising cost per unit.
- What's the difference between margin and ROI?
- Margin measures profit as a share of your selling price (profit divided by price), while ROI measures profit against what you spent to buy the product (profit divided by cost). ROI is usually the higher number and is handy for judging how hard your money is working.
- Is this calculator free to use?
- Yes, it's 100% free with no account, no sign-up, and no limits on how many calculations you can run.
- Is my data uploaded or stored anywhere?
- No. All calculations happen locally in your browser. Your prices, costs, and fees are never sent to a server, saved, or shared.