How the Amazon FBA calculator works
Simple mode takes the referral, fulfilment and storage figures straight from Seller Central's fee preview. Auto mode takes your packaged dimensions, weight, and category, classifies the size tier from the 2026 US rate card, and fills those fees for you. Either way the receipt itemises every deduction and shows net profit per unit, margin, ROI, and break-even price.
Frequently asked questions
Where do I find my exact Amazon FBA fulfillment fee?
In Seller Central, open the Revenue Calculator or your product's fee preview. FBA fees depend on the size tier and shipping weight of your product and change with Amazon's periodic fee updates, so always paste the current number into this calculator.
How much does Amazon take from a sale?
For most categories, a 15% referral fee plus an FBA fulfilment fee that starts around $3 for small standard items and rises with size and weight, plus monthly storage. Combined, 30–40% of the sale price is common.
Does the calculator include the low-inventory or inbound placement fees?
Not automatically — add them in the "other" field per unit. They vary by your inventory levels and inbound plan.