Amazon assigns the item a size tier from its dimensions and weight, then charges a flat per-unit fee for that tier and billable-weight band. Billable weight is the greater of the unit's actual weight and its dimensional weight (length x width x height divided by 139), so a light but bulky item is billed on its volume.
What is the FBA fulfillment fee for a standard-size item?
For a large-standard item one pound or under, the 2026 fee is about 4.60 dollars in the 10 to 50 dollar price band, rising with weight bands. Rates are a little lower for items under 10 dollars. Small-bulky starts around 7.55 dollars and large-bulky around 9.35 dollars, with per-pound surcharges above the base weight.
Andrew Erickson is the founder of Inventory Hero. He has spent years working with Amazon FBA sellers on demand forecasting, restock planning, and the cash flow side of running a private-label brand. Inventory Hero exists because every spreadsheet-based inventory system he tried eventually broke — usually right before Q4.
You cannot change the rate card, but you can change your size tier. Shrink the packaging so the unit stays in a lower tier, reduce dimensional weight by cutting empty space, and verify Amazon's measured dimensions match yours, because a re-measure into a higher tier quietly raises the fee on every unit.
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The FBA fulfillment fee is a flat per-unit charge for Amazon picking, packing, shipping, and handling an order, set by the item's size tier and billable weight rather than its price. The short version: Amazon sorts the item into a size tier, then charges the tier's rate based on the greater of actual and dimensional weight, so dimensions drive the fee. Below are the 2026 rates by tier, how billable weight works, and how to keep packaging from bumping a unit into a more expensive bracket.
Amazon assigns each item a size tier from its unit dimensions and weight, then charges a flat per-unit fee for that tier and weight band. The figure that matters is billable weight, the greater of:
the unit's actual weight, and
its dimensional weight, calculated as length times width times height in inches, divided by 139.
Dimensional weight is why a light but bulky item (a pillow, a lampshade) is billed as if it were heavier: you are paying for the space it occupies in the truck and the warehouse. For a dense item, actual weight wins; for a bulky one, dimensional weight wins.
Representative base rates for items priced in the 10 to 50 dollar band:1
Size tier (example band)
Base fulfillment fee
Large standard, 1 lb or under
$4.60
Large standard, 1 to 1.25 lb
$5.04
Small bulky (base)
$7.55
Large bulky (base)
$9.35
Extra-large, 0 to 50 lb (base)
$26.33
Extra-large, 50 to 70 lb (base)
$37.32
Extra-large, 70 to 150 lb (base)
$51.32
Rates are a little lower for items under 10 dollars and differ in higher price bands. Above the base weight, bulky tiers add a per-pound surcharge (about 0.38 dollars per pound), so a heavy item's fee climbs quickly with each pound.
The tier is set by your unit's dimensions and weight against these cutoffs:2
Size tier
Fits within
Max weight
Small standard
15 x 12 x 0.75 in
1 lb (16 oz)
Large standard
18 x 14 x 8 in
20 lb
Bulky / oversize
exceeds the large-standard limits
higher tiers by weight
A unit that exceeds any one of the large-standard limits, a longest side over 18 inches for example, moves up to bulky or oversize where the fees jump. This is why a package a few tenths of an inch over a boundary pays the higher tier on every unit, and why trimming the box can pay back thousands over a product's life. Run your exact dimensions and weight through the FBA fee calculator to confirm your tier and the precise fee.
A foam cushion weighs 0.7 pounds but measures 14 by 12 by 6 inches:
Input
Value
Actual weight
0.7 lb
Dimensional weight
14 x 12 x 6 / 139 = 7.25 lb
Billable weight
7.25 lb (the greater)
Even though it weighs under a pound, it is billed at about 7.25 pounds because of its volume. The item still fits the large-standard size limits, so it stays large-standard, but it jumps from the under-1-pound fee to a much higher weight band, several dollars more per unit. The fix is packaging: compress it, ship it flatter, or cut the empty space so the dimensional weight drops.
The fee is fixed by the rate card, but your tier is not:
Design to the tier boundaries. The standard-size and bulky thresholds are specific dimension and weight cutoffs. A package a few tenths of an inch over a boundary pays the higher tier on every single unit, so trimming the box can pay back thousands over a product's life.
Cut dimensional weight. Empty space in the box is pure cost when dimensional weight is your billable weight. Right-size the packaging.
Verify Amazon's measured dimensions. Amazon measures your units on intake at a fulfillment center, and a re-measure into a higher tier is a common silent margin leak. Check the measured dimensions in the Manage Inventory fee preview against your own, and contest a wrong measurement through a support case.
The fulfillment fee is one line in the full cost of selling a unit, and the operator rule of thumb is worth knowing: once an item passes about 20 pounds or roughly 36 inches on its longest side, the fulfillment fee climbs enough that fulfilling it yourself (FBM) or via Seller-Fulfilled Prime often beats FBA on margin. Below that, FBA usually wins on convenience and Buy Box performance. Either way, the fulfillment fee sits on top of your inbound freight, your prep or labeling, the referral fee, monthly storage, and the cash tied up in stock. Model the whole stack in the FBA profit calculator before you lock a product and its packaging, because the fulfillment fee is also the one most sensitive to a decision (the box size) you make before the first unit ships.
FBA fulfillment fees are a flat per-unit charge set by size tier and billable weight, where billable weight is the greater of actual and dimensional weight (volume divided by 139). You cannot change the rate card, but you can change your tier through packaging, so design to the tier boundaries and verify Amazon's measurements. Model the exact fee per SKU before you source, since a single tier jump can decide whether the product is profitable.