FBA fees · read November 8, 2026
Amazon aged inventory surcharge calculator
What a unit costs per month once it has sat in an Amazon fulfilment centre for 181 days or more. The charge is per cubic foot, it steps sharply as stock ages, and it is charged on top of normal storage — so enter the dimensions, the age and how many units you are holding.
Aged inventory surcharge per unit, per month
55.6¢
At 300 days in storage, 0.102 cu ft, in the 271–300 days band. For 20 units that is $11.12 a month.
Charged per cubic foot, from the published table.
How the charge works
Amazon charges this by volume, not by value: a cheap unit and an expensive one of the same size pay the same. The rate depends only on how long the unit has been in a fulfilment centre, and it is charged per cubic foot per month for as long as the unit stays past the threshold. Seller Central
The steps are the point. Most bands rise gently, then the table jumps — 50¢ to 100¢ at day 211 (2.0×), 150¢ to 545¢ at day 271 (3.6×). A slow-moving unit does not get slightly more expensive; it gets several times more expensive in a single day.
Add this to monthly storage
These are two separate charges and both arrive. Standard-size storage is 0.78¢ per cubic foot per month from January to September and $2.40 from October to December; the aged surcharge is charged on top once the unit passes 181 days. The storage fee calculator works out the first part, including both seasons, and it is worth running both rather than guessing at the combination.
The published rates
Dollars per cubic foot per month, as published. The third column is the per-unit amount charged from day 366 when it comes out higher than the cubic-foot figure. A dash means the table has no per-unit amount for that band — it is not a zero.
| Days in storage | Per cubic foot | Per unit floor |
|---|---|---|
| 181–210 days | 0.50 | — |
| 211–240 days | 1.00 | — |
| 241–270 days | 1.50 | — |
| 271–300 days | 5.45 | — |
| 301–330 days | 5.70 | — |
| 331–365 days | 5.90 | — |
| 366–455 days | 6.90 | 30¢ |
| 456 days or more | 7.90 | 35¢ |
Worked example — Amazon's own
A unit of 0.102 cubic feet held for 456 days falls in the last band: $7.90 per cubic foot, or 30¢ per unit, whichever is higher. The cubic-foot figure is 80.6¢ per unit, so it wins. For 20 units that is $16.12 for the month — and the same 20 units at 300 days would have been $11.12, so the extra five months of storage cost more than the first ten.
The arithmetic rounds once, on the total: 0.102 × $7.90 × 20 = $16.116, shown as $16.12. Rounding each unit to $0.81 first would give $16.20 — close enough to look right, and wrong on a seller's statement.
Questions
When does the aged inventory surcharge start?
At 181 days in a fulfilment centre. Below that you pay monthly storage and nothing else. The charge is per cubic foot per month, so it repeats for every month an item stays aged — it is not a one-off charge for crossing the line.
Is this on top of storage fees, or instead of them?
On top. Monthly storage (78¢ per cubic foot off-peak, $2.40 in October to December for standard-size units) is charged first, and the aged surcharge is added when the unit passes the age threshold. A 300-day-old unit costs both.
What is excluded?
Clothing and accessories, footwear, bags and handbags and luggage, jewellery, and watches. Amazon excludes those categories from this surcharge, so an item in one of them is not charged however long it sits. Storage still applies.
Why does the fee jump so sharply at 271 days?
Because the published table jumps: 150¢ per cubic foot at 241–270 days, then 545¢ at 271–300 days — 3.6 times as much for one extra day. That is the whole reason this surcharge matters: the cost of a slow-selling unit is not linear, and a month's delay in clearing stock can multiply it.
Which amount applies when two are published?
From day 366 Amazon publishes both a per-cubic-foot amount and a per-unit amount, and charges whichever comes out higher. For a large item the cubic-foot figure almost always wins; for a small one the per-unit floor can. This page shows both numbers and says which one applied to your input.
Does the total round per unit or overall?
Overall. Amazon's own worked example — 80.6¢ per unit times 20 units — comes to $16.12, not 20 rounded to $0.81. The calculator rounds once, at the end, so its total reconciles against a seller's statement rather than drifting a few cents per unit.
When were these rates read?
They were read off the published fee schedule on November 8, 2026. Amazon gives notice before changing fees, but check the source link before pricing a real month.
Rates read on . Before you budget on this, check the current schedule. This is an estimate, not a quote from Amazon.