Amazon FBA Profit Calculator
Calculate your true Amazon FBA profit, margin, and ROI after referral and fulfillment fees.
Your numbers
Net profit per unit
- Sale price
- $35.00
- Product cost
- −$8.00
- Inbound shipping
- −$1.50
- Referral fee
- −$5.25
- FBA fee
- −$5.50
- Storage fee
- −$0.50
- Net profit
- $14.25
On Amazon, your selling price is not your revenue. By the time Amazon takes its referral fee, its FBA fulfillment fee, and storage costs — and you subtract your product and inbound shipping — a $35 product can net far less than sellers expect. This guide shows exactly which fees apply, how to calculate your real profit, and why margin and ROI tell you two different things.
What fees does Amazon FBA charge?
Every FBA sale carries several costs:
- Referral fee — Amazon's commission, a percentage of the sale price (most categories are 15%, with a $0.30 minimum).
- FBA fulfillment fee — a flat per-unit charge for picking, packing, and shipping, based on the item's size and weight tier.
- Monthly storage fee — charged per cubic foot of inventory, higher in Q4.
- Product cost (COGS) and inbound shipping to Amazon's warehouses — your own costs.
How to calculate Amazon FBA profit
Work it from the sale price down. Take a $35 product that costs you $8, with $1.50 inbound shipping, a 15% referral fee, a $5.50 fulfillment fee, and $0.50 storage:
| Line | Amount |
|---|---|
| Sale price | $35.00 |
| Referral fee (15%) | −$5.25 |
| FBA fulfillment fee | −$5.50 |
| Storage | −$0.50 |
| Product cost | −$8.00 |
| Inbound shipping | −$1.50 |
| Net profit | $14.25 |
That's a 40.7% margin and a 150% ROI on the $9.50 you have tied up in each unit. The calculator above does this instantly as you change any input.
Margin vs. ROI — why both matter
These answer different questions:
- Margin = profit ÷ sale price. It tells you how much of each sale you keep — useful for pricing and comparing products.
- ROI = profit ÷ (your cost). It tells you how hard your cash is working — useful for deciding what to restock.
A product can have a thin margin but excellent ROI if it's cheap to source and turns over quickly. Smart FBA sellers watch both.
How to improve your FBA profit
- Cut the fulfillment tier. Smaller, lighter packaging can drop you into a cheaper size band — sometimes the single biggest lever.
- Negotiate COGS with suppliers as volume grows.
- Avoid long-term storage fees by keeping inventory lean and turning it over, especially before Q4 surcharges.
- Raise the price where the listing supports it — even $1 often flows almost entirely to profit, since fees rise only by the referral percentage.
- Check the referral percentage for your exact category — a few categories are below 15%.
The bottom line
Budget for roughly referral (≈15%) + fulfillment + storage on top of your product and inbound costs, then confirm with the calculator. Track margin and ROI, and treat the fulfillment size tier as a design constraint — shrinking the box is often worth more than shaving cents off COGS.
Frequently asked questions
How much does Amazon FBA take per sale?
Amazon takes a referral fee (usually 15% of the sale price) plus an FBA fulfillment fee based on the item’s size and weight, plus monthly storage. On a $35 item that’s often $11+ before your own product and shipping costs.
What is the Amazon referral fee?
The referral fee is Amazon’s commission on each sale — a percentage of the price. Most categories are 15%, with a $0.30 minimum. A few categories are lower; always check the rate for your specific category.
How much are FBA fulfillment fees?
The fulfillment fee is a flat per-unit charge for picking, packing, and shipping, set by the item’s size and weight tier. Smaller, lighter products pay less — which is why packaging size is one of the biggest levers on FBA profit.
How do I calculate FBA profit?
Start with the sale price, then subtract the referral fee, FBA fulfillment fee, storage, your product cost, and inbound shipping. What remains is your net profit. The calculator above does this instantly for any inputs.
What is a good FBA profit margin?
Many sellers target a 20–35% net margin and an ROI above 50–100%. Thinner margins can still work if the product is cheap to source and sells quickly, because ROI — not just margin — drives how fast your cash compounds.
What’s the difference between margin and ROI on Amazon?
Margin is profit divided by the sale price (how much of each sale you keep). ROI is profit divided by your cost (how hard your cash works). A product can have a low margin but high ROI, or vice versa — track both.
How can I reduce my Amazon FBA fees?
Shrink packaging to drop into a cheaper fulfillment tier, keep inventory lean to avoid storage and long-term storage fees, negotiate lower product costs at volume, and confirm you’re in the lowest applicable referral category.
Are there hidden Amazon FBA costs?
Beyond referral and fulfillment fees, watch for long-term storage fees, removal/disposal fees, returns processing, and advertising (PPC). Build a buffer into your numbers so these don’t erase your margin.