Marketplace fees
Amazon FBA Storage Fee Calculator
Amazon charges FBA storage by the cubic foot, not by the item: $0.78 per cubic foot per month from January to September and $2.40 in the October–December peak, for standard-size products. A 12 × 12 × 6 inch unit occupies exactly half a cubic foot, so 200 of them stored for six off-peak months cost $468.00 — and the same stock costs more for three peak months than for six ordinary ones. Enter your unit’s dimensions below.
How much does Amazon charge for FBA storage?
For standard-size products, Amazon’s monthly FBA storage fee is $0.78 per cubic foot from January to September and $2.40 per cubic foot from October to December — the peak-season rate is just over three times the ordinary one. The fee is based on the volume your inventory occupies, averaged across each day of the month: a product of half a cubic foot costs $0.39 per unit per month off-peak and $1.20 per unit per month in the peak. Oversize products are charged at their own, different rates, and stock that sits too long attracts an aged-inventory surcharge on top.
How it works
Amazon measures every product, works out the space it occupies including its packaging, and rents you that space by the month. Whether you searched for an Amazon FBA storage fees calculator, an FBA storage fee calculator or an Amazon storage fees calculator, the calculation is:
Unit volume (cubic feet) = length × width × height (in inches) ÷ 1,728Monthly storage fee = unit volume × rate per cubic foot × units storedTotal storage cost = monthly fee × months storedTwo details decide real bills. First, Amazon charges on the average daily volume your inventory occupies during the month, so stock that arrives late in a month costs less than this calculator’s full-month figure, and stock that sells down costs less as it goes. Second, the calendar dominates everything: at $2.40 against $0.78, a cubic foot held through October, November and December costs $7.20 — more than nine ordinary months. Inventory planning for Q4 is storage-fee planning.
Rates used by this calculator
| Storage period | Standard-size monthly rate | Applies to |
|---|---|---|
| January – September | $0.78 per cubic foot per month | Standard-size products in FBA |
| October – December | $2.40 per cubic foot per month | Standard-size products in FBA (peak season) |
Source: Amazon Seller Central — monthly inventory storage fees (sellercentral.amazon.com), standard-size tier. Last verified: November 2026
Worked examples
Example 1 — a 12 × 12 × 6 in product, 200 units, six off-peak months
| Unit size | 12 × 12 × 6 in |
| Volume per unit | 0.500 cu ft |
| Storage rate (Jan–Sep) | $0.78 per cu ft / month |
| Fee per unit per month | $0.39 |
| 200 units × 6 months | $468.00 |
Example 2 — the same product and stock through the October–December peak
| Unit size | 12 × 12 × 6 in |
| Volume per unit | 0.500 cu ft |
| Storage rate (Oct–Dec) | $2.40 per cu ft / month |
| Fee per unit per month | $1.20 |
| 200 units × 3 months | $720.00 |
Three peak months cost $252 more than six ordinary months for identical stock — the Q4 rate is the whole story.
Example 3 — an 18 × 12 × 8 in product, 50 units, two off-peak months
| Unit size | 18 × 12 × 8 in |
| Volume per unit | 1.000 cu ft |
| Storage rate (Jan–Sep) | $0.78 per cu ft / month |
| Fee per unit per month | $0.78 |
| 50 units × 2 months | $78.00 |
A full cubic foot per unit adds up quickly — products near the standard-size limits deserve a packaging review before a reorder.
When these fees apply — and the limitations
This calculator covers standard-size monthly storage fees only. The main things outside it:
- Oversize products have their own storage rates (different per-cubic-foot figures, in both seasons). If your product exceeds standard-size limits — longest side over 18 inches, median side over 14, shortest over 8, or over 20 lb — this calculator does not price its storage; check the oversize table in Seller Central.
- Amazon’s measurements govern. Amazon measures your packaged product itself and can re-measure it; if its figures differ from yours, its figures are what you are charged on.
- Average daily volume. Real charges follow the space your stock actually occupied each day — units arriving mid-month or selling through will cost less than a flat full-month estimate.
- Aged-inventory surcharges apply on top of monthly storage for stock that has been in fulfilment centres beyond set periods (181 days and up), and are a separate, rising cost of slow stock.
- Other FBA programmes price storage separately — dangerous-goods storage and Amazon Warehousing and Distribution (AWD) have their own schedules, and storage is only one FBA cost alongside fulfilment fees.
Confirm the current standard-size rates in Seller Central before committing to a large shipment.
Comparing your options
Storage is the cost sellers forget when they compare channels. Selling the same product from your own shelf or through the eBay fee calculator’s world of merchant fulfilment, your warehousing cost is your rent divided by your stock — often close to nothing per unit. FBA replaces that with a meter that runs by the cubic foot and triples in Q4, in exchange for Prime eligibility and Amazon handling delivery. The honest comparison is total cost per sale in each channel — fulfilment, storage and fees together — which is what the Etsy profit calculator’s approach of netting every cost against revenue does for its platform.
Frequently asked questions
How does Amazon calculate FBA storage fees?
By volume and time: Amazon works out each product’s size in cubic feet (length × width × height in inches, divided by 1,728), multiplies it by the monthly rate for the season ($0.78 per cubic foot January–September, $2.40 October–December, for standard-size), and charges on the average volume your inventory occupied each day of the month. Two hundred half-cubic-foot units therefore cost $78 a month off-peak and $240 a month in the peak.
Why is FBA storage so much more expensive in Q4?
Because fulfilment-centre space is scarcest exactly when every seller wants it full. Amazon’s October–December standard-size rate of $2.40 per cubic foot is just over three times the $0.78 charged the rest of the year — a deliberate price signal to keep peak capacity for stock that sells, and the reason experienced sellers time shipments and clearances around it.
How do I convert inches to cubic feet for FBA storage?
Multiply the three dimensions in inches and divide by 1,728 (the number of cubic inches in a cubic foot). A 12 × 12 × 6 inch box is 864 cubic inches, which is exactly 0.5 cubic feet. Use the packaged dimensions — the box the customer receives — not the bare product.
Does Amazon charge the same storage rate for oversize items?
No. Oversize products have their own monthly storage rates in both seasons, different from the standard-size figures this calculator uses. If your packaged product is over 18 inches on its longest side, over 14 on its median side, over 8 on its shortest side, or over 20 lb, price its storage from the oversize table in Seller Central instead.
What is Amazon’s aged inventory surcharge?
An additional fee, charged per cubic foot on top of the ordinary monthly storage fee, for units that have been sitting in fulfilment centres longer than set thresholds (which begin at 181 days). It rises the longer stock sits, which is why slow inventory gets expensive twice: it pays the monthly rate every month, then pays a surcharge for having done so. The current thresholds and rates are in Seller Central.
Related calculators
Estimates only. Platforms can change their fees at any time; always confirm the rate on the platform’s own pricing page before making pricing decisions. ToolFees is not affiliated with the platform named on this page.