What Amazon charges every month just to keep your units in the FBA warehouse: the fee that quietly compounds on slow-selling inventory.
Monthly FBA storage fee = total volume in cubic feet × the monthly rate. Amazon bills storage on the cubic feet your inventory occupies, not the unit count: 500 units at 0.3 cu ft each is 150 cu ft, and at the 2026 standard-size rate near $0.78 per cu ft that is about $117 a month. Rates jump sharply in Q4 (roughly $2.40 per cu ft for standard size, October–December), and stock aged past 181 days adds a long-term storage surcharge on top. Enter your units, per-unit volume and the current rate to see your Amazon monthly storage fees and what each unit costs to store.
Monthly storage fee
$117.00
Storage cost per unit
$0.23
Total volume (cu ft)
150
Estimate only. Results reflect exactly the numbers you enter — verify
against your own accounting before making pricing decisions.
Fee defaults last reviewed 2026-08-15. Platforms change
their fees — every rate above is editable, so enter your current
numbers for an exact result.
Worked examples
Standard months (Jan–Sep)
Units in storage
500
Cubic feet per unit
0.3
Storage rate
$0.78
Monthly storage fee
$117.00
Storage cost per unit
$0.23
Total volume (cu ft)
150
150 cu ft at $0.78: about $117 a month to store 500 units.
Q4 peak rate (Oct–Dec)
Units in storage
500
Cubic feet per unit
0.3
Storage rate
$2.40
Monthly storage fee
$360.00
Storage cost per unit
$0.72
Total volume (cu ft)
150
The same inventory more than triples during the holiday storage surcharge.
Amazon monthly storage fees vs the long-term surcharge. FBA monthly storage fees are the base layer: every unit in a fulfillment center pays the per-cubic-foot rate each month, whatever its age. FBA storage costs then rise sharply as inventory ages: past 180 days Amazon adds an aged-inventory surcharge on top of the monthly fee, climbing to $6.90 per cubic foot (or a $0.15 per-unit minimum) beyond a year. If part of your stock is drifting past those thresholds, price the second layer with the Amazon long-term storage fee calculator; the monthly fee here is only the beginning of what slow-moving inventory costs.
Frequently asked questions
How does Amazon calculate FBA storage fees?
By volume, not by units. Amazon measures the cubic feet your inventory occupies (unit size × quantity on hand), averages it over the month, and multiplies by the monthly rate for your size tier. A small, dense product costs little to store; a bulky, slow-selling one can quietly eat its own margin in storage before it ever sells.
Why are Amazon storage fees so much higher in Q4?
Warehouse space is scarcest in the run-up to the holidays, so Amazon raises the standard-size rate from roughly $0.78 to about $2.40 per cubic foot for October through December (oversize rises too). If your product is seasonal, model both rates: carrying dead stock into Q4 is one of the most expensive mistakes on FBA.
What is the long-term storage / aged-inventory surcharge?
On top of monthly storage, Amazon charges an aged-inventory surcharge on units held a long time (tiers begin around 181–271+ days and climb steeply). It is designed to push you to liquidate slow movers. This calculator covers the base monthly fee; add the surcharge for any inventory you expect to sit past those thresholds.
How do I find the cubic feet of my product?
Multiply the packed length × width × height in inches, then divide by 1,728 (the number of cubic inches in a cubic foot). A 10×6×3-inch box is 180 cubic inches, or about 0.104 cu ft. Use the fully-packaged dimensions Amazon measures at the fulfillment center, not the bare product.
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