How Amazon charges monthly storage
Cubic feet per unit
Length × width × height in inches ÷ 1,7288 × 6 × 4.32 ÷ 1,728 = 0.12 cu ftMonthly storage
Cubic feet per unit × units stored × rate per cubic foot0.12 × 1,200 × $0.78 = $112.32Use the packaged dimensions, the box as it sits in the warehouse. The rate depends on the size tier and the month and is higher from October to December. Take the current rate from Seller Central's FBA fee pages: the calculator opens on an example rate, not Amazon's.
Storage per unit sold
Divide the month's storage by the units you sold that month. That is the storage cost each sale carries, and it belongs in your profit per unit as an other per-unit cost. A product that sells slowly carries more storage per sale, and in Q4 every unit stored pays the higher rate.
What the calculator leaves out
- The aged inventory surcharge, charged on top for units stored past a set number of days. FBA Inventory in Seller Central shows it per product.
- Storage utilization surcharges Amazon applies when stored volume is high relative to sales.
- Inbound placement and fulfillment fees, which are charged per unit shipped, not per month stored. Every Amazon seller fee.
Questions
- How do I calculate Amazon storage fees?
- Multiply the packaged unit's cubic feet by the units stored and by the monthly rate per cubic foot for its size tier and month.
- How many cubic feet is my product?
- Length × width × height of the packaged unit in inches, divided by 1,728.
- Are storage fees higher in Q4?
- Yes. Amazon charges a higher rate per cubic foot from October to December.
Keep going
GuidesAmazon FBA storage feesMonthly storage, the Q4 rise, the aged surcharge, and how to lower them.Free toolsAmazon FBA profit calculatorProfit per unit, margin and breakeven ACOS from your price, cost and FBA fee.GuidesAmazon seller fees, explainedEvery fee on an Amazon statement, what triggers it and how to lower it.GuidesYour Amazon profit marginThe three margins per product, and the costs sellers leave out.