Amazon Seller Profit Calculator (FBA and FBM)

Amazon's fees are only part of the picture: a product that looks profitable on the fee calculator can still lose money once freight, advertising and the monthly subscription are counted. This calculator subtracts every per-unit cost — referral fee, FBA fulfillment and storage (or your own postage for FBM), product and freight cost, ad spend and plan fees — and shows the net profit, margin, ROI and monthly total.

How to use this tool

1. Choose FBA or FBM and the product's category, then enter the selling price.
2. For FBA, enter the fulfillment fee for the size tier and storage per unit sold; for FBM, enter shipping charged and your postage cost.
3. Enter the product cost and the freight, duty and prep cost per unit.
4. Add ad spend per unit, your plan and monthly unit sales, then read profit, margin and ROI.

Formula

Net profit = Item price + Shipping collected − Referral − Closing − Fulfillment − Storage − Product − Freight − Ads − Plan fees

Margin = Net profit ÷ (Item price + Shipping collected) × 100

ROI = Net profit ÷ (Product cost + Freight) × 100

Plan fees are $0.99 per item on the Individual plan, or the $39.99 Professional subscription divided by units sold. Media items add a $1.80 closing fee. ROI measures profit against the cash tied up in stock, so it is usually much higher than margin. The $1.80 closing fee also applies to video games, gaming accessories and consoles. These are US fee estimates checked October 30, 2026; account programs, fee-category classification and settlement rounding can differ.

Example

A $29.99 kitchen product sold through FBA pays a 15% referral fee of $4.50, a $5.50 fulfillment fee and $0.25 storage — $10.25 before subscription. Taking off the $8 product cost, $1 freight, $2 of advertising and $0.13 of subscription (300 sales a month) leaves $8.61 per unit: a 28.70% margin and 95.65% ROI, or $2,582 a month.