FBA fees · read November 8, 2026
Amazon low-inventory-level fee calculator
Amazon charges this fee per unit when your stock runs low relative to your sales — below 28 days of supply. The amount depends on the unit’s size and weight and on how far below the threshold you fell. Enter your weight and days of supply to see the rate.
Low-inventory fee per unit
$0.70
Charged on each unit shipped while your supply is under 21 days. If 500 units ship while you are below the threshold, that is $350.00 in total.
A flat amount from the published table — not a percentage, and not a range.
How the fee works
Days of supply is the whole trigger: stock on hand divided by average daily sales. Amazon then charges a flat amount per unit that depends on the size class, the weight band, and which of the three low-supply bands you are in — under 14 days, under 21, or under 28. Below 14 days costs the most, because Amazon's promise of fast delivery is hardest to keep. Seller Central
The fee stops entirely at 28 days of supply. That is why this page has a "No fee" answer rather than a zero: running out is expensive, but so is overstocking, and Amazon only charges for one of those.
The published rates
Cents per unit, as published. A dash means the table carries no figure for that combination — it is not a zero.
| Small standard-size — up to 16 oz | ||
|---|---|---|
| Days of supply | up to 16 oz | |
| 28 days or fewer | 32¢ | |
| 21 days or fewer | 63¢ | |
| 14 days or fewer | 89¢ | |
| Large standard-size — up to 320 oz | ||
| Days of supply | up to 48 oz | over 48 to 320 oz |
| 28 days or fewer | 36¢ | 47¢ |
| 21 days or fewer | 70¢ | 87¢ |
| 14 days or fewer | 97¢ | 111¢ |
Bulky and oversize units are priced in a different table, which this page does not carry. Enter a weight above 320 oz and the calculator shows no figure rather than borrowing a standard rate.
Worked example
A large standard-size unit weighing 12 oz, with 18 days of supply, falls in the under-21-days band and the up-to-48-oz weight column, which is 70¢ per unit. If 500 units ship while you are below the threshold, the fee is $350.00. Get back above 28 days of supply and the same 500 units cost nothing in this fee.
Questions
What counts as low inventory?
Amazon's measure is days of supply: your units in stock divided by your average daily sales. If that figure stays under 28 days, the fee applies to the units you ship while it is low. At 28 days or more there is no fee, and none of the bands above are charged.
Is the fee a percentage of the sale price?
No. It is a flat amount per unit, set by the unit’s size class, its weight band and how far below the threshold your supply fell. A cheap item and an expensive one of the same size and weight pay the same.
Why does the weight matter twice?
For standard-size units, Amazon splits large standard into two weight bands — up to 48 oz and above 48 oz to 320 oz — and charges more for the heavier one. That is why the table on this page has two weight columns for large standard units and only one for small.
Is my product exempt?
That depends on your inventory metrics in Seller Central, which this page cannot see. What this page prices is the rate in the published table; whether a fee applies to a given product on a given day is Amazon's determination. Check the source link before you budget on it.
Does the fee apply to every unit I sell that week?
It applies to units shipped while your days of supply are below the threshold, which is why the calculator asks how many units ship in that period. Amazon assesses the metric over a rolling window, so in practice the charge lands on a subset of your sales rather than all of them.
When were these rates read?
They were read off Amazon's published fee schedule on November 8, 2026. Amazon gives notice before changing fees, but check the source link before pricing a real month.
Rates read on . Before you budget on this, check the current schedule. This is an estimate, not a quote from Amazon.