Amazon Low Inventory Level Fee Calculator.
Use your actual 30-day and 90-day historical days of supply from Seller Central to estimate the current Amazon US low-inventory-level fee per shipped unit and across a unit count.
Inventory details
Use the historical days of supply shown in Seller Central.
Select a supported product size and weight tier.
Used only to estimate the total fee across those shipped units.
Turn this on only if Amazon explicitly shows an exemption for the product or account.
Low-inventory fee estimate
Enter valid Seller Central inventory metrics to calculate the fee.
Rates last verified: August 13, 2026. Uses current published US fee tiers. Eligibility and exemptions remain account and product specific. Gencyh is not affiliated with Amazon.
How the fee is determined
Enter the two historical days-of-supply metrics shown by Amazon: the short-term value based on the last 30 days and the long-term value based on the last 90 days. The fee can apply only when both are below 28 days.
When both metrics are below 28, the greater of the two values determines the rate band. The calculator then applies the current rate for the product size and weight tier you select.
Current low-inventory-level fee rates
Rates below are per shipped unit in US dollars and are generated from the calculator's verified rate configuration.
| Product tier | Under 14 days | 14 to under 21 days | 21 to under 28 days |
|---|---|---|---|
| Small standard · up to 16 oz | $0.89 | $0.63 | $0.32 |
| Large standard · up to 3 lb | $0.97 | $0.70 | $0.36 |
| Large standard · 3+ to 20 lb | $1.11 | $0.87 | $0.47 |
| Small Bulky · up to 50 lb | $1.85 | $1.02 | $0.51 |
| Large Bulky · up to 50 lb | $2.09 | $1.15 | $0.57 |
Frequently asked questions
When does Amazon's low-inventory-level fee apply?
For products covered by the fee, both the short-term 30-day and long-term 90-day historical days-of-supply metrics must be below 28 days. If either metric is 28 days or higher, this calculator returns no low-inventory-level fee.
Which days-of-supply number sets the fee rate?
When both metrics are below 28 days, Amazon uses the greater of the 30-day and 90-day historical days-of-supply values to determine the applicable fee tier.
Where do I find historical days of supply?
Use the historical days-of-supply values shown for the product in Amazon Seller Central. This calculator does not invent those account-specific inventory-history metrics.
Does the calculator handle exemptions?
If Seller Central explicitly shows that the product or account is exempt, you can mark the exemption option and the estimate becomes zero. Do not select it based on a guess.
What does estimated total fee mean?
It multiplies the current per-shipped-unit rate by the number of shipped units you enter. Your actual charged units and account-specific eligibility are determined by Amazon.
Related Amazon tools
Fee source
Eligibility rules and fee tiers are checked against Amazon's official low-inventory-level fee documentation.