Amazon FBA Fee Calculator

It combines three Amazon FBA charges: a referral fee (modeled at a flat 15% of your Selling Price), an FBA fulfillment fee that scales with a size/weight tier, and a monthly storage fee based on the cubic footage of your package dimensions. It then subtracts all three plus your Product Cost from Selling Price to show Net Profit, Profit Margin, and ROI for a single unit.

The fulfillment fee is based on shipping weight, which Amazon calculates as whichever is greater: your product's actual Weight or a dimensional weight derived from Length times Width times Height divided by 139. Larger, lighter-but-bulky packages can therefore land in a higher fee tier than their actual weight alone would suggest, which is why entering accurate package dimensions matters as much as entering accurate weight.

No — Product Cost has no effect on the fees Amazon charges at all; the referral fee, fulfillment fee, and storage fee are calculated purely from Selling Price and package dimensions/weight. Product Cost only affects the Net Profit and ROI figures downstream, where a lower sourcing cost directly increases your profit without changing a single fee line.

Amazon fulfillment fees use whichever is larger of your declared Weight or a dimensional weight computed from the package's Length, Width, and Height. If your dimensional weight already exceeds your entered Weight — common for bulky, lightweight items — small changes to Weight alone won't move the fee at all until Weight both exceeds the dimensional figure and crosses the next weight-tier boundary.

Not precisely — it applies one flat 15% referral rate and a simplified fulfillment fee schedule, while Amazon's real fee structure varies the referral percentage by product category and periodically revises its fulfillment tiers and rates. Use this tool to get a realistic planning estimate before listing a product, then confirm exact fees in Amazon Seller Central's fee calculator for your specific category before finalizing pricing.