Enter price, costs, and category. Amazon fees are deducted instantly so you see your net margin, no spreadsheets needed.
If you bought in bulk, enter the totals here and the cost and freight per unit are calculated automatically below.
Save this scenario into a folder (per product) to compare it later against other suppliers or shipping methods. Stored in this browser — nothing is sent to any server.
Before you buy, it helps to know if the product is already selling, and at what scale. We don't calculate these numbers for you — fill them in with what you find on Amazon (e.g. the "X+ bought in past month" note on the listing) or another research tool.
A direct projection based on the numbers you enter — not a guaranteed forecast. Use it to weigh your entry cost (purchase + freight + fees) against a revenue expectation before deciding on the order.
Your margin comes from subtracting the referral fee (Amazon's commission by category), the FBA fulfillment fee, the product cost, and the freight you paid to ship it to Amazon's warehouse from the selling price.
ROI is calculated on what you actually put out of pocket (cost + freight + other), not on the selling price — that's why it's usually a higher number than the margin.
| category | referral fee |
|---|---|
| electronics | 8% |
| home & kitchen | 15% |
| clothing & accessories | 17% |
| beauty & personal care | 8–15% depending on price |
| toys & games | 15% |
| sports & outdoors | 15% |
| other / general | 15% |
Percentages are approximate reference values. Amazon updates them periodically — confirm the exact number for your category in Seller Central.
Yes, 100% free with no sign-up. It runs entirely in your browser — no account or payment details needed.
As a general reference, 15-25% or higher is considered a healthy margin. Below 10% your business is very exposed to any surprise costs, and below 5% you're likely losing money once everything is accounted for.
Amazon mainly charges two fees: the referral fee (a % of your selling price, based on category) and the FBA fulfillment fee (based on product weight and size). This calculator deducts both automatically from the price you enter.
When a customer returns a product, it often can't be resold — you lose the product cost plus part of the fees you already paid. That's why this calculator lets you estimate that cost as a % of your sales instead of ignoring it.
Margin is your net profit as a % of the selling price. ROI is your net profit as a % of what you actually put out of pocket (cost + freight + other). That's why ROI is usually a higher number than margin.
No. All calculations run in your browser, and anything you save in the folders section stays only in that browser (localStorage). Nothing is sent to any external server.