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Amazon FBA storage fee calculator

Storage is the fee sellers forecast last and get surprised by first, because the rate roughly triples for October, November and December. Put your own volume in and see the Q4 bill before you commit the stock.

YOUR INVENTORY

What your stock costs to sit there — and what October does to it.

Amazon charges monthly storage per cubic foot, and the rate rises sharply for October, November and December. Inventory you send in early for Q4 is billed at the peak rate for every month it waits. This shows that bill before you commit to it.

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THE BILL

TOTAL OVER THE WINDOW
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PEAK MONTHS
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VOLUME STORED
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AGED SURCHARGE
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What this does not do

It forecasts storage, and only storage. It does not include referral fees, fulfilment fees, removals or disposal - those are separate charges and belong to different tables. For per-unit economics use the US revenue calculator or the UK one.

It also assumes your stock sits still. Real inventory sells down through the window, so a forecast on today's units is the upper bound for a product that is selling and roughly right for one that is not. Deliberately so: the case worth catching early is the stock that is not moving, and a smoothed sell-through curve would hide exactly that.

Nothing you type is sent anywhere. The calculation runs in your browser, and there is no sign-up because a storage rate is not worth an email address.

Questions people actually ask

Amazon charges a peak monthly storage rate for those three months in both markets. In the US the standard-size rate goes from $0.78 to $2.40 per cubic foot - a little over three times - and oversize from $0.56 to $1.40. The UK rise is smaller but still substantial. The rate applies to whatever is sitting in the warehouse during those months, regardless of when it arrived, which is why inventory sent early for Q4 is the expensive kind.
Send it in time, not early. Every extra month it waits in an Amazon warehouse across October to December is billed at roughly triple the off-peak rate, so a month of unnecessary safety margin on a large shipment is a real number - this calculator will show you what it is for your own volume. Against that, running out in Q4 costs more than storage does. The point is to make the trade deliberately rather than treat early arrival as free.
A charge on top of the base rate for holding more inventory than you are shipping. Amazon divides your average daily stored volume by your average daily shipped volume over the past 13 weeks, giving a figure in weeks of cover. Below 22 weeks there is no surcharge. Above it the rate climbs by band, and it is calculated per size tier. Enter your own weeks of cover and it is included above; leave it blank and only the base rate is used.
For the US, yes - enter how old the stock is now and the aged-inventory surcharge is projected forward across the window, ageing thirty days a month, on the bands that took effect in January 2026. From 366 days Amazon charges whichever is greater of a per-cubic-foot rate and a per-unit rate, and the calculator applies that rule. For the UK it does not, because we have not captured a UK long-term storage table. The page says so rather than leaving you to assume none applies.
Amazon's own published rate cards - the Seller Central storage fee help page for the US, and the FBA rate card PDF for the UK. Each is stored as data and read when the page loads, so there is one copy of every rate rather than a copy in the tool and another in our files. The capture date and effective date are printed under the results. If Amazon has revised a rate since, that date is how you will know to check.
Because Amazon is renting you shelf space, not counting items. Two products selling at the same rate can cost very different amounts to store if one is twice the size, which is why the calculator asks for dimensions rather than just a unit count. It is also why reducing packaging is one of the few levers that lowers this bill without lowering stock cover.