FBA Storage Calculator
FBA Storage Calculator
Amazon bills storage by the space your stock takes up, every month it sits there. Enter a product’s dimensions and see what it costs to keep — before you ship a single carton.
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The FBA Storage Calculator turns length, height and width into a storage cost for the Amazon marketplace you sell in — UK, US, EU, Japan or Canada, each in its own currency. It’s the number that quietly decides whether a bulky, low-priced product is worth stocking at all.
The cost that never shows up on the product page
Price gets checked. Fees get checked. Ad spend gets watched daily. Volume usually doesn’t — until the storage line lands on the statement. And it lands every month, for every unit still sitting in a fulfilment centre.
A product that takes up a lot of space and sells slowly is paying rent the whole time it waits. Two products each making the same profit per sale can be very different businesses if one fits in a padded envelope and the other needs a shoebox.
Three dimensions and a marketplace
Length, height and width in centimetres, and where you sell.
What that unit costs to store
In the marketplace’s own currency, while the stock is still with you.
What the tool does
Pick a marketplace, enter the packaged dimensions, and calculate. The storage cost comes back straight away:
Key features
Every marketplace you sell in
Switch between the UK, US, EU, Japan and Canada in one click. Each region reports in its own currency, so you’re reading the cost in the money you’re actually billed in — not a converted guess.
Built around the packaged unit
Amazon measures storage on the packaged unit, not the product inside it. So enter the box, not the bottle. A snug pack and a loose one can cost very differently to store, and this is where you find out which you’ve got before the print run is ordered.
Why October to December matters
On Amazon.com, the monthly storage rate for standard-size products roughly triples from October to December. Bulky stock sent in early for the holidays pays that peak rate for every month it waits to sell — which is exactly when knowing a unit’s footprint pays for itself.
Pairs with the rest of your research
Storage is one line of the decision, not all of it. Use the Keyword Difficulty Checker to see the demand, the FBA Sales Estimator to gauge how fast it would sell, and this calculator to see what it costs to hold while it does. Once it’s live, Amazon Ads AI shows the real profit after every cost.
How it works — three steps
Who it’s for
Why sellers trust it: the maths, shown plainly
Storage is one of the few Amazon costs you can work out before you spend anything. This tool does exactly that: your dimensions, your marketplace, the storage cost. No black box and no inflated projection — just the number that tells you whether a product earns the space it takes up.
Frequently asked questions
What is an FBA storage calculator?
A tool that works out what it costs to keep a product in Amazon’s fulfilment centres, from the space it takes up. Amazon charges storage by volume, so a product’s size matters to its profit as much as its price does.
Which marketplaces are supported?
The United Kingdom, United States, the EU, Japan and Canada, each reported in its own currency.
What do I need to enter?
The marketplace, and the packaged length, height and width in centimetres. Measure the unit as it will sit on Amazon’s shelf, packaging included.
How does Amazon charge for storage?
Monthly, based on the average daily volume your inventory occupies, measured on the packaged unit. On Amazon.com the standard-size rate is roughly three times higher from October to December than the rest of the year, and extra surcharges apply to inventory that has been stored for a long time.
Is it included in membership?
Yes. It’s part of Pro alongside every other tool — including eCom Claw, Amazon Ads AI, rank tracking, keyword difficulty and the AI assistant — for $10/mo.
How do I get access?
Access is included with membership. Sign up here to start calculating.
Know the space before you ship
Every carton you send in is billed by the space it takes, every month it stays. Work out what that costs first — then decide what’s worth the shelf.
$10/mo · includes the full Pro suite: eCom Claw, Amazon Ads AI, rank tracking, keyword difficulty and the AI assistant.
