Work out your FBA monthly storage cost per cubic foot, what Q4 peak rates do to it, and what the aged inventory surcharge adds once units pass 181 days.
Free Amazon storage fee calculator
Enter your box dimensions and unit count. Rates are prefilled with Amazon's published US monthly storage rates and aged-inventory surcharge tiers. Everything runs in your browser, no signup.
Storage cost this month
$216.67
Cubic feet per unit
0.556
Total cubic feet
277.8
Base monthly storage
$216.67
Aged inventory surcharge
$0.00
Cost per unit
$0.43
Rate applied
$0.78/cu ft
Amazon bills on average daily volume, so a month where stock arrives mid-cycle costs less than this estimate. Peak season roughly triples the standard-size rate.
See the storage fee you actually paid, per SKU
Nova reads the real storage and aged-inventory charges from your Settlement Reports and puts them in your P&L next to the margin they eat. 14-day free trial, no card.
Rates below follow Amazon's published monthly inventory storage fee schedule and the aged inventory surcharge. Other marketplaces use local rate cards.
| Size tier | Jan to Sep | Oct to Dec |
|---|---|---|
| Standard size | $0.78 / cu ft | $2.40 / cu ft |
| Oversize | $0.56 / cu ft | $1.40 / cu ft |
| Days in stock | Surcharge |
|---|---|
| 0 to 180 days | No surcharge |
| 181 to 270 days | $0.50 / cu ft / month |
| 271 to 365 days | $1.00 / cu ft / month |
| 366 days and over | $6.90 / cu ft / month |
This calculator gives you a planning number. Nova gives you the charge Amazon actually applied, allocated to the SKU that caused it, next to the margin it consumed.
Amazon bills storage on volume, not on units. It measures the average daily cubic feet your inventory occupied during the month, multiplies that by the rate for your size tier, and adds the charge to the following month's settlement. That is why two SKUs selling the same number of units can carry very different storage costs: the bulkier one pays for air.
From October to December the standard-size rate roughly triples. Sellers who ship Q4 stock in early October pay peak rates on every unit that has not sold, which is the single most common reason January margins look worse than December revenue suggested.
Past 181 days, the aged inventory surcharge stacks on top of base storage and escalates at 271 and 366 days. Combined with fulfillment fees and referral fees, storage is one of the three costs that decide whether a slow mover is merely unexciting or actively destroying profit. Nova puts all of them in one P&L per SKU, so you can rank products by profit after storage rather than by revenue.
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Monthly rates, peak season, aged inventory and what shows up on your settlement.
Explore in-depth guides to get the most from this feature
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