FBA FEE CALCULATOR
Which Amazon size tier is your product in, after prep padding?
Amazon calculates FBA size tier from packed dimensions, which are the raw product dimensions plus any prep padding (poly bag, bubble wrap, custom wrap). Adding 0.5 inch of bubble wrap to a product within one inch of a tier boundary can push it into a higher tier and raise fulfillment fees by $2 or more per unit. This checker runs packed-dimension math.
Enter raw dimensions and weight, add prep padding, see the tier Amazon will actually apply to the packed version. Products within one inch of a boundary get flagged.
Free. No signup. Current 2026 size-tier thresholds. Packed-dimension math.
Catch the boundary before you add the SKU.
The authenticated app runs the boundary check on every SKU as you add it to your catalog, flags products within one inch of any tier threshold, and accounts for prep padding automatically. $19 to $25 a month. 14-day free trial. Founding-member price lock for waitlist signups.