Amazon FBA Calculator

Price change	Price	Profit / order	Net margin
-20%	$31.99	$5.49	17.17%
-10%	$35.99	$8.89	24.71%
Current	$39.99	$12.29	30.74%
+10%	$43.99	$15.69	35.67%
+20%	$47.99	$19.09	39.78%

Price	Free, no sign-up
Input	Price, landed cost, FBA fee, ad cost, referral %
Output	Referral fee, net profit per unit, margin, break-even price
Runs	Entirely in your browser

What is Amazon FBA Calculator?

Amazon FBA economics are decided by three numbers: the referral fee (usually 15% of the sale price, with category variations), the FBA fulfilment fee (set by size tier and weight), and your landed cost. Add advertising and the profit per unit can halve compared with the number a spreadsheet shows before fees. This calculator applies the referral percentage to the selling price, takes the fulfilment fee as a cost line, and returns net profit per unit, net margin, return on landed cost and the break-even price — along with a sensitivity table showing what happens across a range of selling prices.

Common Uses for Amazon FBA Calculator

Screen a product idea before sourcing it
Check whether an FBA product still works after a fee increase
Compare FBA fees against your own fulfilment costs
Set a maximum ad spend per unit while keeping a target margin
Reprice after a supplier cost rise

Fees scale with price, fulfilment does not

The 15% referral fee grows with every price increase, so raising a $34.99 item to $39.99 returns only $4.25 of the $5 (the other $0.75 goes to Amazon), while the FBA fee is unchanged. That is why raising prices is the fastest margin lever on price-flexible products.

The ad budget the numbers allow

Gross profit before ads sets your maximum cost per acquisition. A $12.40 unit profit supports up to $12.40 per unit-sale in ads at break-even; a 20% net margin target caps it at about $5.40. Anything beyond that needs a higher price, a subscription, or a bundle to lift the average order.

Sizing is a profit decision

Moving a product from the large-standard tier to small-standard, or shaving a centimetre off a package, can cut the fulfilment fee by 20–40%. Product and packaging design is often the highest-return margin work in an FBA business.

Frequently Asked Questions

What is the Amazon referral fee?

Most categories charge 15% of the total sales price, with media at 15% and a few categories lower or higher. Some categories also carry a minimum referral fee of around $0.30.

How is the FBA fulfilment fee calculated?

By size tier and shipping weight: small standard, large standard, and the oversize tiers, each with its own rate ladder that changes every year. Look up the current fee for your product's tier and enter it as the shipping cost.

What margin should an FBA product have?

Target a 25–35% net margin after referral and fulfilment fees, before ads. After advertising, 15–20% net is a solid FBA business; anything under 10% is fragile to fee and freight changes.

Does the calculator include FBA storage fees?

Not separately — add the monthly and long-term storage cost per unit to the shipping field if your inventory turns slowly. Storage is small for fast sellers and painful for slow ones, which is why inventory turns matter as much as margin.

What about returns on FBA?

Amazon refunds the referral fee on most returns but you usually lose the fulfilment fee and, often, the unit itself. Add a provision (return rate × unit cost) to the product cost if your category has return rates above 5%.