What problem does this calculator solve?
Amazon sellers need to combine several cost categories before deciding whether a product’s unit economics work. Our independent simulator makes those assumptions visible.
A price may look viable until inbound shipping, fulfillment, ads, and returns are included. This simulator keeps each cost assumption visible.
Six practical questions, answered clearly
Find the calculation behind your question. These answers explain how to use the inputs and results when making a decision.
Is my product financially viable for Amazon FBA?
Enter net sales revenue, purchase cost, fulfillment fees, referral fees, and other relevant costs. The simulator calculates the contribution left after those inputs.
What is the most I can pay to source an FBA product?
Set the planned selling price, other costs, and target contribution. The calculator solves for the maximum purchase cost that meets that target.
How do Amazon fees change my margin?
Fulfillment and referral fees reduce the amount left from each sale. The simulator shows them within the full unit-cost calculation.
At what selling price will my FBA product break even?
The simulator finds the price at which contribution is zero, taking the entered percentage fee into account. This threshold excludes costs you have not entered.
How do returns affect the profitability of an FBA product?
Choose the return-rate method, then enter the additional net cost per return and an assumed return rate. Their product gives the expected return cost per sale.
How much advertising spend can my FBA product support?
Start with contribution before advertising. That amount is the modeled advertising ceiling per sale before contribution falls to zero, excluding unentered fixed costs.
Worked example
Synthetic example, not an Amazon fee schedule: €100 net revenue, a 10% fee on a €119 base, and €54 unit costs produce an €11.90 fee, €34.10 contribution, and a rounded-up €61.30 break-even price.
Formula and calculation method
Calculate using your own assumptions
Enter values in a single currency. Results update as you change inputs. Save up to three scenarios for this session. Copy and CSV export include the assumptions and explanations used.
Practical use cases
- Model a new inventory purchase.
- Compare higher advertising cost per sale.
- Include returns as an expected per-unit cost.
Assumptions and limitations
Not an official Amazon calculator. Enter fees for the relevant market and product. No automatic size, weight, season, or tier calculations. Allocate storage and expected return cost per sale.
Further official information
FAQ: Using the tool, capabilities, and calculation limits
Does the simulator load current Amazon fees?
No. Fees are entered manually. The tool does not retrieve live Amazon fee data.
Is this an official Amazon calculator?
No. This is an independent SEOSTUDIO tool.
Can storage costs be included?
Yes. Enter the storage cost allocated to each sale as an additional cost component.
Can I include advertising costs in the FBA calculation?
Yes. Advertising costs can be entered per sale.
Does a positive contribution guarantee business profit?
No. Fixed costs, taxes, and other expenses may change the final business result.
At what price does an FBA product break even?
The break-even price covers entered unit costs and the modeled referral fee. A higher price contributes toward unentered fixed costs and profit.
Are current Amazon fees preloaded?
No. Even the loadable example is synthetic. Supply applicable terms from official information and your own costing.
How should I allocate storage cost per item?
Allocate expected inventory storage cost across a realistic number of sales. Compare that assumption across scenarios rather than assigning all storage costs to one sale.
What does tax added to the fee base mean?
Some fees apply to a tax-inclusive selling price. This input increases only the percentage-fee base; it is not added to net revenue or profit.
How can I test the impact of more returns?
Increase expected return cost per sale and save both scenarios. Consider refunds, processing costs, and inventory that cannot be resold.
Clear on the numbers—need professional support?
We help connect business assumptions with an appropriate website, marketing, or business strategy. Your inquiry is free and nonbinding. Consultation pages are in German.
Amazon FBA SEO & marketing consulting (German)
Request a free, nonbinding consultation →Calculation model V1.1 · Formulas maintained with the tool · editorial update: November 9, 2026.