Free Amazon FBA Profit & Margin Calculator
Type your sale price, cost of goods, FBA fee, and referral fee to see real net profit per unit, profit margin, and ROI after every Amazon fee. Use it to decide whether a product is worth sourcing. Free, no login, all math runs in your browser.
How to calculate Amazon FBA profit
Start with your sale price and subtract everything Amazon and your supply chain take: COGS, the FBA fulfillment fee, the referral fee (a percentage of price), inbound shipping, storage, and a returns allowance. What is left is your net profit per unit before advertising.
Margin vs ROI
Profit margin is profit as a percentage of your sale price. ROI is profit as a percentage of the cash you put into the unit (COGS plus inbound shipping). A cheap-to-source product can have a modest margin but a strong ROI.
What is a good Amazon profit margin?
Many sellers target 15–30% net margin after fees but before ad spend, leaving room to advertise and still profit. Thin-margin products leave little cushion for PPC — which is exactly where sellers quietly lose money.
Frequently Asked Questions
- Are these fee numbers exact?
- The math is exact for what you enter, but FBA and referral fees are estimates until you pull the real figures from Seller Central. RedHen syncs the actual fees Amazon billed you so your profit is the real number.
- Does this include advertising cost?
- No — it shows profit before ads, so you can see whether a product is worth selling at all. Use the free break-even ACoS calculator next to find your maximum ad spend.
- Can I track this on every product automatically?
- Yes. RedHen tracks true net profit per product across your whole catalog, flat fee, never a percentage of sales. Start a 14-day free trial at rrw-ads.com/pricing.