What does the Amazon FBA profit calculator compute?

Selling price minus unit cost (COGS), Amazon referral fee, FBA fulfillment fee, and ad spend per unit. It reports net profit in USD, net margin as a percent, and ROI as a percent — all live, per SKU.

Which Amazon FBA costs does the profit calculator include?

Unit cost (COGS), the Amazon referral fee as a percent of selling price, the FBA fulfillment fee in USD per unit, and ad spend per unit. Selling price is the gross input. Enter them one by one and the result updates as you type.

How do I use the Amazon FBA profit calculator?

Enter the five inputs in the form — selling price, unit cost (COGS), referral fee percent, FBA fulfillment fee per unit, and ad spend per unit — and read net profit, margin %, and ROI as you type. No signup required.

How is ROI different from margin %?

Margin % is profit divided by selling price — what your buyer paid. ROI is profit divided by the dollars you put in (unit cost plus ad spend per unit) — what your money earned. Both are reported, because tracking one and missing the other is how sellers lose money on "high-margin" SKUs.

Is the Amazon FBA profit calculator free?

Yes. The calculator is free, requires no signup, and runs entirely in your browser.

Free tool · no signup

Amazon FBA profit calculator — net profit, margin, and ROI per SKU, instantly.

Enter a selling price, COGS, referral fee %, FBA fulfillment fee, and ad spend. See net profit, margin %, and ROI update as you type. No signup, no email.

Inputs

What does it cost you to sell one unit?

Defaults are realistic for a typical small-format FBA SKU — change any number and the result updates instantly.

Selling priceUSD / unit

What the buyer pays on Amazon.

COGS / unitUSD / unit

Unit cost from your supplier, landed.

Amazon referral fee% of selling price

The category fee Amazon takes on every sale.

FBA fulfillment feeUSD / unit

Amazon's pick, pack, ship, and weigh cost.

Ad spend / unitUSD / unit

Average Sponsored Products cost per sale.

Result

Net profit, margin, and ROI — per unit.

Net profit / unit$7.99

Margin26.65%Net profit ÷ selling price

ROI99.89%ROI = net profit / COGS. Add ad spend to COGS in your head if that's how you think about it.

Referral fee$4.50

FBA fee$5.50

COGS$8.00

Ad spend$4.00

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