Free tool
One warehouse or several?
Amazon charges an inbound placement fee to send your shipment to a single warehouse, a reduced one to split bulky stock across two or three, and nothing at all to spread it across five or more. Amazon prices its half and shows you the number. The half nobody has worked out is your own freight. Put both in and see which option actually costs less.
What are you sending?
Any order. We'll sort them for you.
Amazon's published US inbound placement fees for shipping plans created on or after 15 January 2026. Every fee is a range because Amazon varies it by which warehouse your shipment is routed to. Weight bands use the greater of your unit weight and dimensional weight (volume ÷ 139), as Amazon does. This tool prices one shipping choice - it doesn't tell you how much inventory to send, and it covers one product at a time.
What this does, and what it won't
It uses Amazon's published fees, as ranges. Amazon varies the placement fee by which warehouse your shipment is routed to, so it publishes a low and a high for every size and weight band. This tool keeps both, because averaging them into one number would hide the thing that decides close calls.
It tells you when the answer is genuinely unclear. If the options overlap, there is no honest winner from published rates alone. You get the exact per-unit gap between Amazon's two quotes that would tip it, and a nudge to read those quotes inside your shipping plan. Where an option can't win even at its best, it's ruled out and labelled.
It works out the weight band Amazon will bill. Above Small standard, Amazon uses the greater of your unit weight and your dimensional weight - volume divided by 139. A big light box often lands several bands higher than its weight suggests, which is exactly where the fee gets misjudged, so this calculates it rather than warning you about it.
It will not tell you how much stock to send. This prices one shipping choice. It knows nothing about your margin, your demand or your lead times, and running out in Q4 costs far more than the fee does.
One product at a time. With several products in one shipment, Amazon's five-identical-cartons rule needs the same product mix in every carton, which changes the answer.
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