2026 Amazon Low-Inventory-Level Fee Solver: Calculate 30-day and 90-day historical days of supply to determine if your inventory triggers Amazon's low-stock fee (enforced when BOTH averages drop below 28 days).
Item Size Tier & Fee Schedule
Inventory & Sales Velocity Inputs
units
units
Velocity: 15.0 units/day
units
Velocity: 15.0 units/day
units
Used to calculate total low-inventory fee exposure on your next shipment batch
Verify before you act
Fees vary by ASIN, category, package size and weight, and marketplace. Confirm exact 2026 rates on the official Amazon Seller Central Documentation before pricing or sourcing decisions. This tool is provided for seller planning purposes only.
Low-Inventory StatusFee Active (< 28 Days)
Total Fee Exposure on Shipment
$156.00
Rate = $0.52 / unit (300 units)
16.7d
30-Day DoS
16.7d
90-Day DoS
28d
Benchmark
Units Needed to Clear Fee(Target ≥ 28 Days)
+170 units(Brings 30D to 420 or 90D to 420)
Historical Days of Supply vs 28-Day Threshold
28-Day CutoffRed line at 28 days indicates Amazon's low-inventory threshold. Fee charged only if BOTH bars are red.
Frequently Asked Questions — Low-Inventory-Level Fee
Key facts regarding 30-day and 90-day days of supply rules
What is the Amazon Low-Inventory-Level Fee?▼
Introduced by Amazon to ensure fulfillment centers are adequately stocked, the Low-Inventory-Level Fee applies to products that have consistently low inventory relative to their historical sales volume, making it difficult for Amazon to distribute products close to customers.
When does the Low-Inventory-Level Fee get triggered?▼
The fee is triggered ONLY when BOTH your 30-day historical days of supply and your 90-day historical days of supply drop below 28 days. If either your 30-day OR 90-day supply is 28 days or greater, you are exempt from the fee.
How is historical days of supply calculated?▼
Historical days of supply is calculated as your current inventory units divided by average daily sales velocity. 30-day velocity = (units sold last 30 days ÷ 30). 90-day velocity = (units sold last 90 days ÷ 90).
Are new sellers or new ASINs exempt from low-inventory fees?▼
Yes, Amazon exempts new professional sellers for their first 90 days, newly launched FBA parent ASINs for the first 180 days, and ASINs that sold fewer than 20 units in the past 7 days.
How can I avoid paying the low-inventory-level fee?▼
You can avoid the fee by maintaining at least 28 days of inventory supply in Amazon FCs. Sending an inbound shipment that brings either your 30-day or 90-day inventory coverage above 28 days clears the fee requirement.
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