At 300 units a month that is about $3,057 in monthly profit. Referral and FBA fees vary by category, size and weight, so use Amazon's current fee schedule for exact numbers. Every fee field above is editable.
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Your real Amazon FBA profit is what is left after every fee and cost comes out of the selling price. Take your price, subtract your product cost, inbound shipping, the referral fee, the FBA fulfillment fee and storage, and what remains is your margin. The calculator above runs that math instantly so you can see whether a product is actually worth selling before you order inventory.
Three fees do most of the damage to an FBA margin. The first is the referral fee, a commission Amazon takes on every sale as a percentage of the selling price. It is commonly 15%, but it ranges roughly from 8% to 20% across categories, and some categories apply a minimum referral fee per item. The second is the FBA fulfillment fee, a flat per-unit charge based on the item's size and weight that pays for Amazon picking, packing and shipping the order. The third is the monthly storage fee, charged per cubic foot of inventory, which climbs sharply in the fourth quarter and again if your stock ages into long-term storage. On top of those, you still carry your own product cost and the inbound shipping to send units into Amazon's warehouses.
The formula is just subtraction done in order. Start with the selling price. Take away the referral fee, which is the referral percentage times the price. Take away the fulfillment fee and the per-unit storage. That gives you total Amazon fees. Now subtract your product cost and inbound shipping as well, and you have net profit per unit. Profit margin is that profit divided by the selling price; ROI is the same profit divided by what you put into the unit, meaning product cost plus inbound shipping. ROI matters because it tells you how fast your cash comes back: a unit that costs $9.50 all-in and returns $10 in profit recycles your money far quicker than one with a thin margin, even at the same price. Run a few products through the calculator and you will quickly see which ones clear your threshold.
There are four levers. Pricing is the fastest: even a small price increase often drops straight to the bottom line, so test where demand holds. Sourcing is the biggest long-term win, since shaving your COGS through better suppliers, larger order quantities or freight negotiation compounds on every unit you ever sell. Dimensions and weight quietly control your fulfillment and storage fees, so smaller, lighter, better-packed products in a lower size tier keep more of each sale. Finally, driving external traffic changes the equation entirely: shoppers you bring from Google, content and AI search land on your listing ready to buy, which lifts conversion and can improve your organic rank inside Amazon, so you depend less on costly Amazon ads. That last lever is where an SEO program pays back, by sending qualified demand to your listings at a fraction of pay-per-click cost.
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