Low Inventory Fee Calculator
Avoid Low Inventory Level Fees
Inventory & Sales Data
Enter your product's current inventory and sales velocity to calculate potential low inventory fees.
Total sellable units in Amazon warehouses
Units/day over last 30 days
Units/day over last 90 days
Expected units to ship to Amazon each week
Standard size items have different fee thresholds
Fee Analysis & Results
Historical Days of Supply
Amazon uses the HIGHER of 30-day or 90-day supply
2025 Fee Tiers (Standard Size)
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How to Use This Calculator
Enter Inventory Level
Input your current FBA inventory units for the product
Add Sales Data
Enter your average units sold per day over the past 30 and 90 days
Enter Expected Orders
Add the number of units you expect to ship weekly
View Fee Analysis
See your estimated low inventory fee and days of supply status
Get Recommendations
Receive actionable tips to avoid or minimize the fee
Calculate your Amazon FBA low inventory level fee (LIFF) based on historical days of supply. Avoid penalties of $0.32-$1.11 per unit.
Pro Tips
- Keep 35+ days of supply as a buffer
- Monitor both 30-day and 90-day metrics
- Amazon updates fee assessments weekly on Mondays
- New-to-FBA products have 90-day exemption
Common Use Cases
Use professional inventory tools to track stock levels and avoid costly low inventory fees
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Frequently Asked Questions
What is the Amazon Low-Inventory-Level Fee?
The Low-Inventory-Level Fee (LIFF) is charged when your FBA inventory falls below a 28-day supply based on historical sales velocity. Amazon calculates this using both 30-day and 90-day historical days of supply metrics. The fee ranges from $0.32 to $1.11+ per unit depending on how low your inventory drops.
How is the low inventory fee calculated?
Amazon compares your current inventory against your historical 30-day and 90-day sales velocity. If your inventory covers less than 28 days of supply (based on the HIGHER of the two periods), you may incur a fee. The fee per unit ranges from $0.32 (21-28 days supply) to $1.11+ (0-6 days supply).
How can I avoid the low inventory fee?
Keep at least 28 days of historical supply (ideally 35+ days to be safe). Monitor your inventory weekly, use Amazon's restock recommendations, set up inventory alerts, and consider using AWD (Amazon Warehousing & Distribution). Products in FBA for less than 90 days are exempt.
What products are exempt from the low inventory fee?
Products are exempt if: 1) New to FBA (less than 90 days), 2) Product is being discontinued, 3) Using AWD (Amazon Warehousing & Distribution), 4) Very low sales velocity (under certain thresholds). Starting January 2026, bulky items will also be subject to this fee.
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