Key takeaways
- Fees depend on packaged size and weight.
- Dimensional weight can raise charges for bulky items.
- Accurate measurements prevent wrong tiers.
- Design packaging with tier thresholds in mind.
Fees depend on the packaged item
FBA fulfillment fees are based on the size and weight of the product as packaged for shipping, which is not necessarily the same as the product alone. Packaging adds to dimensions and weight, so decisions about boxes and inserts affect fees.
How size tiers work
Amazon groups items into size tiers, such as standard or oversize, based on dimensions and weight thresholds. Within each tier, bands based on weight determine the specific fee. Tier definitions and boundaries are set by Amazon for each marketplace and may change.
Dimensional weight
Some tiers use dimensional weight, which accounts for the space an item takes up as well as its actual weight. A light but bulky item can be charged as if it were heavier. Check which weight Amazon uses for your product's tier.
Measure accurately
Measure and weigh your packaged product carefully and compare with what Amazon has recorded for the listing. If the catalog shows incorrect dimensions, the wrong fee may apply. Update measurements through the proper process when they are wrong, and keep evidence.
- Measure the final packaged product
- Compare with catalog dimensions
- Check the tier and fee in Seller Central
- Update records if they differ
Design packaging with tiers in mind
Small changes in packaging can move a product into a lower tier, sometimes saving more per unit than a supplier price negotiation. Consider trimming packaging, using flexible materials or changing the number of units per pack, while protecting the product and branding.
Review before each inbound shipment
Check expected fees for each product before shipping, because new packaging or a supplier change may alter dimensions. Compare actual fees on early orders with your expectations.
Fee changes over time
Amazon updates fee schedules periodically, so build a habit of reviewing announcements and re-running your product-level profitability. Note effective dates and test alternatives.
A worked example
A seller finds a product sits just over a size limit because of a slightly oversized carton insert. Replacing the insert with a flatter alternative drops the packaged height under the threshold, moving the product to a lower tier. Savings accrue on every unit sold.
Common mistakes
Typical mistakes include trusting supplier-provided dimensions without checking, ignoring packaging changes and failing to monitor fee changes. Keep a table of packaged dimensions, weights and tiers for each product.
Your next three steps
Make sure you are in the right tier before you ship.
- Measure and weigh the packaged product, not just the item.
- Compare your measurements with the catalog record.
- Test whether small packaging changes could move the product down a tier.
Key terms
A few terms used above, in plain language.
- Size tier: a band of dimensions and weights with its own fee.
- Dimensional weight: a weight figure based on volume.
- Packaged dimensions: the size of the item as shipped.
Frequently asked questions
Can I change dimensions in the catalog?
Where your measurements are correct, follow the current process for updating product information and keep evidence.
Do tiers differ by country?
Yes. Each marketplace defines its own tiers and fees.
This guide is general information. Amazon's fees, policies and program rules change and vary by marketplace, so confirm current details in Seller Central and, for tax or legal questions, with a qualified adviser.