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Amazon FBA Calculator
Estimates Amazon referral, FBA fulfilment and storage fees per unit, then gives profit, margin, ROI and the break-even selling price.
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Paste the figure from Seller Central; leave 0 to estimate
Enter your figures and press Calculate.
In short
Amazon FBA Calculator is a free online tool on inputtesthub.com that estimates Amazon referral, FBA fulfilment and storage fees per unit, then gives profit, margin, ROI and the break-even selling price. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Amazon FBA Calculator
- Enter your figures in the input fields.
- The result updates as you type, together with the full working.
- Check the breakdown table to see exactly how the number was reached.
About the Amazon FBA Calculator
The Amazon FBA Calculator estimates Amazon referral, FBA fulfilment and storage fees per unit, then gives profit, margin, ROI and the break-even selling price. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Checking a product idea before committing to a purchase order.
- Seeing how much of the price a heavier package costs you.
- Finding the lowest price that still leaves a margin.
Details
| Referral fee | Usually 15%, minimum 30c |
|---|---|
| Electronics | 8% |
| Fulfilment | Stepped by size tier and weight, not a rate |
| Storage | Roughly triples October to December |
| Small standard | Under 16 oz and within 15 × 12 × 0.75 inches |
The maths behind it
This tool uses profit = price − referral fee − FBA fulfilment fee − storage − advertising − unit cost − inbound shipping, where the referral fee is a percentage with a 30c minimum and fulfilment is a stepped charge by size tier and weight. Every intermediate value is shown on screen, so the result can be checked by hand.
The fulfilment figures follow the US standard-size schedule and Amazon revises rates at least yearly, usually in January and again before peak. Storage also rises sharply from October to December, and long-term storage surcharges apply past 181 and 271 days. Treat the estimate as a starting point and replace it with your own fee preview before ordering stock.
Where this tool stops
Returns processing fees, removal orders, low-inventory and placement service fees, the 39.99 monthly professional plan, and the aged-inventory surcharge are all outside this model. For a marginal product any one of them can be the difference between profit and loss.
Explained in our guides
All guidesFrequently asked questions
Why is my real FBA fee different from the estimate?
Fulfilment is charged on the greater of actual weight and dimensional weight, measured by Amazon at the fulfilment centre — not by you. Packaging that pushes a unit into the next size tier or weight band changes the fee in a step, not gradually. The override field is there to hold the real number once Seller Central shows it.
Is a 30% margin good for FBA?
Margin matters less than return on cost when your capital, not shelf space, is the constraint. A 20% margin that turns over six times a year beats a 40% margin that turns over twice. This tool prints both so the comparison is possible.
Is the Amazon FBA Calculator free?
It is free, with no account, no trial and no daily cap. Every calculators tool on inputtesthub.com works the same way: open the page and use it.
Does anything I enter leave my computer?
No. The Amazon FBA Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What is the equation behind the Amazon FBA Calculator?
It uses profit = price − referral fee − FBA fulfilment fee − storage − advertising − unit cost − inbound shipping, where the referral fee is a percentage with a 30c minimum and fulfilment is a stepped charge by size tier and weight. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What is the Amazon FBA Calculator used for?
The most common reasons people reach for it: checking a product idea before committing to a purchase order. Seeing how much of the price a heavier package costs you. Finding the lowest price that still leaves a margin. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Where does the Amazon FBA Calculator stop being reliable?
Returns processing fees, removal orders, low-inventory and placement service fees, the 39.99 monthly professional plan, and the aged-inventory surcharge are all outside this model. For a marginal product any one of them can be the difference between profit and loss. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the Amazon FBA Calculator?
Referral fee is Usually 15%, minimum 30c. Electronics is 8%. Fulfilment is Stepped by size tier and weight, not a rate. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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