Estimate monthly FBA storage cost from inventory volume and storage rate
Enter the storage rate from Seller Central. Amazon rates can vary by month, product size, inventory age, and marketplace.
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This FBA storage cost tool is for sellers who need to estimate how much inventory volume costs while products sit in Amazon fulfillment centers. Enter the packaged length, width, height, number of units, monthly storage rate per cubic foot, and months stored to calculate cubic feet per unit, total inventory volume, monthly storage fee, total storage cost, and storage cost per unit. Use it before sending a large shipment, holding slow-moving inventory, planning Q4 stock, or deciding whether bulky products still have enough margin after storage fees. The rate is editable because Amazon can vary storage charges by marketplace, month, product size, inventory age, and policy changes. It is especially useful for restock planning, aged inventory checks, seasonal overstock, and bulky products where storage cost can quietly reduce profit before the item sells.
A 12 x 10 x 8 inch packaged unit uses about 0.556 cubic feet. If you store 100 units at $0.87 per cubic foot, the estimated monthly storage fee is about $48.33.
If those 100 units sit in FBA for 3 months, total storage cost is about $145, or roughly $1.45 per unit before fulfillment, referral, or advertising costs.
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Amazon storage fees are based on how much space inventory occupies over time. A practical estimate needs packaged dimensions, unit count, monthly storage rate, and the number of months the inventory may remain in FBA.
Use the dimensions of one sellable packaged unit, not the master carton or supplier carton. Measure length, width, and height in inches as the unit will be stored and fulfilled by Amazon.
The calculator multiplies length × width × height, then divides by 1,728 to convert cubic inches into cubic feet. This gives the storage volume per unit.
Enter the number of units expected to sit in FBA inventory. This can be your current stock, planned shipment quantity, or the slow-moving units you expect to carry through a season.
Use the storage rate shown in Seller Central for your marketplace, month, and product type. Rates can change by season, size type, inventory age, and Amazon policy, so the field is editable instead of hardcoded. Run separate scenarios for normal months and peak inventory periods if both could affect the same shipment.
The calculator multiplies total cubic feet by the monthly rate, then by the number of months stored. It also shows storage cost per unit so you can add it to product pricing or profit calculations. This is useful when comparing a large replenishment order with a smaller, faster-turning restock.
If storage cost per unit is high, test smaller packaging, smaller restock quantities, faster sell-through, or a non-FBA fulfillment option. Storage fees matter most for bulky, low-margin, seasonal, or slow-moving products where inventory sits longer than expected.
Amazon storage fees are generally based on the amount of fulfillment-center space your inventory uses, measured in cubic feet, and the monthly storage rate that applies to that inventory. The basic planning formula is packaged unit volume × units stored × monthly rate × months stored.
Multiply length × width × height in inches, then divide by 1,728. For example, a 12 × 10 × 8 inch package is 960 cubic inches, or about 0.556 cubic feet per unit.
Use the rate shown in Seller Central for your marketplace, product size type, and time period. Amazon can change storage fees by month, product size, inventory age, and policy updates, so this calculator keeps the rate editable.
No. FBA fulfillment fees are charged when Amazon picks, packs, and ships an order. Storage fees are charged for keeping inventory in Amazon fulfillment centers over time. A product can have both costs.
Yes if inventory sits in FBA long enough for storage cost to matter. For slow-moving or bulky products, storage cost per unit can reduce margin and should be included in Amazon FBA profit planning, especially when you are comparing a large shipment against smaller restocks with faster sell-through.
Improve sell-through, ship smaller restock quantities, reduce package size, remove aged inventory, use promotions to clear slow stock, or compare FBA with merchant fulfillment for bulky products. Review this before every major replenishment order and seasonal inventory plan.
Learn how landed cost, markup, margin, fees, and shipping affect product pricing in our product pricing guide.
