What FBA capacity limits are
FBA capacity limits cap how much inventory you can send to and store at Amazon fulfillment centers over a month, measured in cubic feet. Amazon replaced its older restock limits with capacity limits in 2023 and sets them separately by storage type, such as standard-size, oversize, apparel and footwear, with dangerous goods handled as their own type.
Limits are shown in the Capacity Monitor in Seller Central, usually with an estimate for upcoming months. They apply to inventory on hand plus inventory in shipments you have created, so building a shipment uses capacity before the units physically arrive.
What drives your limit
Amazon bases capacity limits on factors including your sales history, sell-through, inventory performance and the capacity available in its network at that time. Sellers with strong sell-through relative to inventory on hand generally see more favorable limits, while slow-moving or excess inventory tends to work against you.
Amazon also offers ways to request additional capacity in some cases, such as making a request in Capacity Manager with a reservation fee that may be offset by performance credits when the added capacity is used well. The rules behind these programs change, so treat any specific mechanism as something to check in Seller Central rather than a permanent feature.
Why limits create stockouts
Limits create stockouts when inventory you need cannot get into FBA in time. A typical scenario: a container lands, sales are climbing and the next month's limit comes in lower than expected. You can only send part of the container, the rest has nowhere to go, and best sellers run out while units sit at the port or in a garage.
The reverse also happens. Sellers who send everything they can whenever capacity opens up end up with high inventory levels that hurt sell-through, which can make future limits worse and add storage utilization surcharges or aged-inventory charges on top.
Storage type and cubic volume
Because limits are measured in cubic feet, the shape of your product matters as much as unit count. Bulky items use limit quickly, while small, dense items can fit many units into the same allowance. Oversize and standard-size inventory draw from separate limits, so oversize sellers often feel the squeeze first.
Packaging decisions can help. Reducing package dimensions, removing unnecessary void fill and choosing carton configurations that fit Amazon's handling well all reduce the cubic feet each unit uses, which stretches your limit further. Check that any packaging change still meets Amazon's prep and protection rules.
Planning with days of cover
The most practical way to work within capacity limits is to plan in days of cover. For each SKU, decide how many days of sales you want available at Amazon, based on inbound lead time plus a safety buffer, then send only what is needed to maintain that level.
For example, if a SKU sells steadily, inbound usually takes a couple of weeks from shipment creation to availability and you want a safety buffer, you might target a few weeks of cover beyond lead time. Multiply by daily sales and unit volume to see how much of your limit that SKU needs, then add up across the catalog. If the total exceeds your limit, you know which SKUs to prioritize before anything is shipped.
Prioritizing when capacity is tight
When capacity is tight, prioritize SKUs by contribution, not just sales volume. Fast movers with strong margins and high ranking value come first, because stockouts on those SKUs are expensive and slow to recover from. Slow movers and long-tail variants can run leaner at Amazon and be fulfilled through MCF or other channels from upstream stock if needed.
Also consider which SKUs are near a promotion, a seasonal peak or a ranking milestone. Capacity spent on a product that is about to spike is worth more than capacity spent on one that sells the same every week.
How upstream storage helps
Upstream storage turns capacity limits from a crisis into a scheduling problem. With bulk inventory held at a 3PL, containers can land whenever they arrive, and FBA receives only what fits your plan. When limits rise, you send more. When they fall, inventory waits upstream at pallet-rate storage instead of in an overflow scramble.
Upstream stock also gives you options Amazon cannot: fulfilling DTC or Walmart orders from the same pool, using MCF as overflow, or staging bundles and promotional kits for later waves. And because only working inventory sits inside Amazon, sell-through stays healthy, which supports better limits over time.
Capacity limits and related FBA fees
Capacity limits do not operate alone. Amazon layers several inventory fees on top of them, and planning only around the limit can still leave you paying more than you need to.
The low-inventory-level fee applies to many standard-size products when your inventory at Amazon is low relative to demand, so running too lean to save capacity can trigger a charge of its own. At the other end, storage utilization surcharges apply when inventory on hand is high relative to sales, and aged-inventory surcharges apply to units that have been stored for a long time. Monthly storage fees also rise from October through December.
The practical target is a band, not a single number: enough cover to avoid low-inventory fees and stockouts, and little enough that inventory turns before surcharges begin. Amazon publishes the current thresholds for each fee, and they change, so review them when you set days-of-cover targets. Upstream storage is what makes holding inventory inside that band realistic, because the excess has somewhere cheaper to wait.
A monthly capacity routine
A simple monthly routine keeps limits under control:
- Check Capacity Monitor for current and upcoming limits by storage type.
- Update days-of-cover targets by SKU for the coming month, including promotions.
- Compare needed capacity with available capacity and prioritize if they do not match.
- Schedule replenishment waves and confirm upstream inventory is prepped and ready.
- Review slow movers and decide whether to remove, discount or move them to other channels.
Done consistently, this routine keeps you in stock, protects your sell-through and makes each month's limit easier to live with.
Frequently asked questions
How often do FBA capacity limits change?
Amazon updates capacity limits monthly and shows estimates for upcoming months in Capacity Monitor. Plan replenishment around both the current and projected limits.
Do shipments in transit count against capacity limits?
Yes. Capacity limits count inventory on hand plus inventory in shipments you have created, so creating a shipment uses capacity before the units arrive.
How can I get higher capacity limits?
Improving sell-through and avoiding excess inventory generally helps. Amazon may also allow requests for additional capacity through Capacity Manager, subject to its current rules and fees.