Amazon FBA Profit Calculator
FBA profit per unit is your selling price minus the landed cost of the product and every Amazon charge against that sale: the category referral fee, the FBA fulfillment fee, monthly storage allocated per unit, and your advertising cost per unit sold. This calculator subtracts that full stack and returns net profit, net margin, return on investment, and the break-even price below which the SKU loses money. Enter your own numbers below; the fields load with a worked example already filled in.
Calculate profit per unit
How the profit calculation works
The arithmetic is a single subtraction chain, but the order matters because one of the fees is a percentage of price rather than a fixed amount:
- Referral fee = selling price × referral rate. This is charged on the total sales price on every sale, whether Amazon or you fulfills it.
- Total cost per unit = landed product cost + referral fee + FBA fulfillment fee + storage per unit + advertising per unit + other costs.
- Net profit = selling price − total cost per unit.
- Net margin = net profit ÷ selling price. This is the number to compare against the 8-15% band that most private-label businesses run on.
- Return on investment = net profit ÷ landed product cost. This is the number that tells you how fast your working capital compounds across reorder cycles.
- Break-even price = (all fixed per-unit costs) ÷ (1 − referral rate). Dividing rather than simply adding the referral fee matters because a lower price also lowers that fee, so the break-even point is not just cost plus fees.
Two inputs are routinely understated. Advertising per unit should be blended across all units sold, not just ad-attributed ones, because organic sales are subsidized by the ad spend that drives rank. Storage per unit should reflect your actual turn rate: a SKU that sits for three months carries three months of storage, and the October to December peak rate runs far above the off-peak rate, as covered on the storage and aged inventory calculator.
Worked example: a $24.99 kitchen SKU
These are the values the calculator loads with, so you can see the method and the widget agree. Figures are illustrative.
- Selling price $24.99, landed cost $8.20, referral rate 15%, FBA fulfillment fee $6.10, storage $0.12 per unit, advertising $2.90 per unit.
- Referral fee: $24.99 × 0.15 = $3.75.
- Total cost per unit: $8.20 + $3.75 + $6.10 + $0.12 + $2.90 = $21.07.
- Net profit: $24.99 − $21.07 = $3.92 per unit.
- Net margin: $3.92 ÷ $24.99 = 15.7%. Return on investment: $3.92 ÷ $8.20 = 47.8%.
- Break-even price: ($8.20 + $6.10 + $0.12 + $2.90) ÷ 0.85 = $20.38. Any promotion below that price sells at a loss even before returns.
The lesson in the last line: a "20% off" coupon taking this SKU to $19.99 does not shave 20% off profit, it erases all of it. Model deals with the deal and coupon impact calculator before scheduling them.
Frequently asked questions
What is a good profit margin for an Amazon FBA product?
Most established private-label sellers operate on 8-15% net margin after every fee and advertising cost. Below 8% a single fee increase or a returns spike can push the SKU into a loss, and above 20% you are usually either in a low-competition niche or under-investing in advertising.
What is the difference between profit margin and ROI on Amazon?
Margin is profit divided by selling price and tells you how much of each sale you keep. ROI is profit divided by your product cost and tells you how hard your cash is working. A $30 item with $4 profit has a 13% margin, but if it only cost $6 to land, the ROI is 67%.
Does this calculator include Amazon advertising costs?
Yes. The advertising field takes your blended ad cost per unit sold, which is total ad spend divided by total units sold, not just units attributed to ads. Leaving advertising out is the most common reason a SKU looks profitable in a spreadsheet and loses money in the settlement report.
Why is my actual Amazon profit lower than this calculator shows?
The usual gaps are returns and reimbursement shortfalls, long-term storage and aged inventory surcharges, removal or disposal orders, and coupon or deal fees not entered here. Compare the result against a full settlement report period rather than a single order to catch those.
What referral fee percentage should I enter?
Referral fees are set by category and commonly run 8-15%, with 15% applying to many consumer categories. Check the referral fee table in Seller Central for your exact category, because some categories use tiered rates that change above or below a price threshold.
Sources
- Amazon Seller Central: referral fee schedule, FBA fulfillment fees, and the Revenue Calculator (primary source for your exact per-ASIN fees).
- Seller Signal analysis. All example figures above are illustrative planning values, not current published rates.