Amazon U.S. · FBA fee
Low-inventory-level fee, by days of supply.
Enter average daily inventory and shipped units for the last 90 and 30 days. The larger days-of-supply figure picks the tier; below 28 days on both measures triggers the fee.
Days of supply = average daily inventory units ÷ average daily shipped units, measured over 90 and 30 days. The fee applies only if BOTH are under 28 days; the larger one sets the tier: under 14, 14 to 21, or 21 to 28 days.
Inventory and sales
Result
Effective date and rate source
Rates and rules effective 15 January 2026, as printed on Amazon’s “Low-inventory-level fee” page (read 18 October 2026): the metric is measured per seller-FNSKU and the fee now covers Small and Large Bulky, with Grocery exempt.
Method and limits
Historical days of supply = average daily inventory units ÷ average daily shipped units, over the last 90 days (long term) and 30 days (short term). The fee applies only when both are under 28 days, and the LARGER of the two chooses the tier. If a product shipped no units, days of supply cannot be computed and no fee applies.
Per-unit fee added to the FBA fulfillment fee on every shipped unit (days of supply under 14 / 14 to under 21 / 21 to under 28): small standard $0.89 / $0.63 / $0.32; large standard up to 3 lb $0.97 / $0.70 / $0.36; large standard over 3 to 20 lb $1.11 / $0.87 / $0.47; small bulky $1.85 / $1.02 / $0.51; large bulky $2.09 / $1.15 / $0.57.
Exempt: Grocery; new Professional sellers for 365 days; FBA New Selection parent products for 180 days; SKUs 70% or more auto-replenished through AWD; and products that sold fewer than 20 units in the past 7 days. Amazon updates the metric weekly and the latest value sets the rate for units shipped that week, so use this as a forecast, not an invoice.
Sources
Retrieved
- Amazon Seller Central: Low-inventory-level fee
- Amazon Seller Central: 2026 US Referral and FBA fee changes summary
Fee schedules belong to Amazon and change; this tool is an independent calculator, not an Amazon service, and does not verify your account or SKU. For a SKU-specific figure use Seller Central. Runs entirely in your browser; nothing you type is sent or stored.
FAQ
What is the Amazon low-inventory-level fee?
It is a per-unit fee added to the FBA fulfillment fee on shipped units when a product’s inventory is low relative to demand. Amazon says it exists to optimize delivery speeds and shipping costs across the network.
When does the low-inventory-level fee apply?
Only when both the 90-day and 30-day historical days of supply are below 28 days. If either measure is 28 or more, no fee applies, and the larger of the two sets the fee tier.
How much is the low-inventory-level fee?
From $0.32 to $2.09 per shipped unit depending on size tier and days of supply, for example $0.97, $0.70 or $0.36 for a large standard item up to 3 lb at under 14, 14 to 21 and 21 to 28 days.
Which products are exempt?
Grocery products, new Professional sellers for their first 365 days, FBA New Selection parent products for 180 days, SKUs mostly auto-replenished through AWD, and products that sold fewer than 20 units in the past 7 days.
How do I avoid the fee?
Send enough inventory that the 30-day days of supply exceeds 28, or keep the 90-day figure above 28. Amazon also offers AWD auto-replenishment, which removes the fee for SKUs where 70% or more of replenishment is automated.