Methodology and formula
Preventing Cash Flow Erosion in Amazon Fulfillment Centers
Understanding Cubic Foot Volumetric Calculations
Amazon calculates storage fees by multiplying total packaged volume in cubic feet by the applicable monthly rate. Cubic feet is calculated as (Length x Width x Height in inches) divided by 1,728.
Inventory Turn Velocity & Liquidation Triggers
If an ASIN has been stored for over 150 days with low sell-through velocity, running aggressive promotional discounts or removal orders before day 180 is almost always cheaper than paying aged storage penalties.
Frequently asked questions
Why do storage fees spike in Q4 (October through December)?
Amazon increases standard-size storage rates from $0.78/cu ft to $2.40/cu ft (+207%) during holiday peak months to maximize warehouse space utilization for fast-turning gifts.
What is the aged inventory surcharge threshold?
Aged inventory surcharges begin after 180 days in Amazon fulfillment centers, scaling from $0.50/cu ft up to $6.90/cu ft (or $0.15/unit) at 365+ days.