Amazon FBA Calculator

How does this tool compute profit per unit?

Profit = selling price − (product cost + shipping to Amazon + PPC per unit + referral fee + fulfilment fee + storage + closing fee). The referral fee is the selling price times a rate fixed by your category choice, the fulfilment fee is a flat amount fixed by your size tier, and the closing fee of $1.80 applies only to the Books / Media category. Storage is the per-unit figure you type, not a calculation from volume.

Where do the fee amounts come from, and are they current?

They are the figures built into this tool: referral rates by category, a flat fulfilment fee per size tier and the books closing fee. Amazon changes its fee schedules, and the built-in numbers may not match what Amazon charges today, so check Amazon’s current fee pages before you order inventory. The tool cannot look up your product’s real size, weight or fee.

How is the break-even price calculated?

Because the referral fee rises with price, the break-even price is the fixed per-unit costs divided by (1 − referral rate): (product cost + shipping + PPC + fulfilment + storage + closing fee) ÷ (1 − rate). With the default 15% rate and $15.22 of other costs, this gives $17.91. At that price profit is zero.

How are margin and ROI defined?

Margin is profit ÷ selling price. ROI is profit ÷ (product cost + shipping to Amazon), so fees, storage and PPC reduce the numerator but are not counted as capital invested. If product cost and shipping are both zero, ROI is shown as n/a rather than a figure. Negative profit gives negative margin and ROI, marked “(loss)”.

What does the storage field mean?

It is a cost per unit sold, added to every unit’s costs; it is not a monthly total divided by anything. If your actual storage bill is $50 for the month and you sell 100 units, enter 0.50. The tool does not calculate storage from cubic feet, season or time in stock.

What happens with zero units or a zero price?

A selling price of zero or less returns only a message asking for a price. Units of zero are accepted, so per-unit figures remain and the monthly and annual lines show $0.00. A blank units field is treated as 100. Annual profit is simply monthly profit × 12, with no allowance for seasonality or growth.

What costs does it leave out?

Anything with no input box: returns and refunds, product prep or labelling, extra inbound fees, long-term storage, taxes, your own time and software subscriptions. It also uses one flat fulfilment fee per tier, whereas real fees can depend on exact weight and dimensions. Use the result as a first screen, then confirm with Amazon’s own estimator.