FBA capacity limits are monthly caps measured in cubic feet, and they can block new shipments the moment you hit them. Open Capacity Monitor in Seller Central now to see your number. Capacity Manager lets you request more space, and your Inventory Performance Index (IPI) shapes the baseline you start from. If you’re blocked, pause shipment creation and identify your slowest SKUs.
TL;DR:
- On hand inventory and created but undelivered shipments both use capacity immediately, so cancel or delay inbound loads before they block new shipment creation.
- Limits reflect IPI, sell through, forecasted demand, open shipments, and fulfillment network needs; some monthly adjustments have included cuts of up to 75%.
- Capacity Manager awards space to the highest fee bids, while sales on added units can offset up to 100% of the reservation fee.
- AWD bulk inventory does not count against FBA limits, and automatic replenishment can keep fast selling items in FBA while slower stock stays in storage.
1. What FBA capacity limits are and how Amazon enforces them
Amazon’s streamlined capacity system, effective March 1, 2023, replaced a patchwork of limits with a single month-long FBA capacity limit. It measures capacity in volume (cubic feet), though Amazon still shows unit estimates so you can plan.
The part that catches sellers off guard is what counts. According to Amazon’s own guidance, utilization includes on-hand inventory and shipments you have created that have not yet arrived. A large inbound shipment therefore eats space the moment you create it, not when it lands.
When you are at or over the limit, Send to Amazon can refuse to create new shipments. Overage fees were eliminated in July 2024, but the block remains, so the limit still controls your replenishment.
2. What determines how much capacity you get
Amazon sets limits monthly, based on recent seller performance and inventory needs. Maintaining a high IPI is the key long-term strategy for securing higher standard limits. Several inputs matter:
- IPI and account performance: Healthy sell-through, low excess and a clean catalog raise your baseline.
- Sales velocity and forecasted demand: ASINs that move fast and forecast well earn more room.
- Open shipments: Inbound lead times count toward utilization, so shipments sitting in transit can block new ones.
- Fulfillment center capacity: Amazon’s network planning shifts month to month, so your limit can move even when your performance doesn’t.
Variance can be steep. Industry commentary notes that capacity adjustments can be as large as 75% cuts in some months.
Pro Tip: Treat IPI as the lever you control. Clearing excess and aged units improves your score and your next limit at the same time.
3. How to check your limits in Seller Central
You can verify your numbers in a few minutes:
- Open Seller Central and go to Inventory, then Inventory Performance, or start from the FBA Dashboard.
- Find Capacity Monitor and open it to see your current monthly limit.
- Switch to Capacity Manager to view estimated limits and request options.
- Compare your utilization against the limit.
- Check your open shipments for anything you can cancel or delay.
Read these fields carefully:
- Current monthly limit: Shown in cubic feet, with unit estimates alongside.
- Estimated next two months: Amazon provides estimates for the following two months, which is your planning runway.
- Utilization split: On-hand inventory versus open shipments tells you what to fix first.
Watch for shipment-block warnings and email notifications, since they signal you are near the cap.
4. How to request more capacity with Capacity Manager
Capacity Manager works like an objective auction. You set a reservation fee per cubic foot, and Amazon grants requests starting with the highest fee per cubic foot until available capacity is allocated.
The cost can come back to you. Sales generated by the extra capacity earn performance credits, which can offset up to 100% of the reservation fee. That ties the expense to real sell-through: strong sellers recover it, slow sellers don’t.
Keep these points in mind:
- Prioritization is by fee alone: Bidding higher improves your odds, but only bid what your sell-through can justify.
- Timing matters: Submit requests early in the cycle, not the day you need the space.
- Early release: If a request is approved, you may be able to ship sooner than the new month begins.
- Match the request to demand: Ask for volume tied to SKUs you expect to sell, so credits can offset the cost.
Pro Tip: Estimate your expected sales on the added units before you bid. A reservation fee only pays off when those units sell.
5. Tactics to manage capacity when limits are tight
You don’t always need a formal increase. Start by freeing space:
- Remove slow and stranded SKUs: Create removal orders for aged or low-velocity units, or plan transfers out of FBA.
- Use AWD for bulk storage: Amazon Warehousing and Distribution holds bulk inventory that does not count toward FBA storage limits.
- Turn on auto-replenishment: AWD can replenish FBA automatically, keeping fast movers in stock while long-tail inventory stays in bulk locations.
- Ship smaller and more often: Frequent, right-sized shipments keep open-shipment volume low.
- Push sell-through: Run promotions or targeted advertising on items clogging space, and delay inbound shipments that would push you over.
The FBA Inventory tool helps you spot excess and aged stock, and our own guide to FBA inventory management covers inventory hygiene in more depth.
Pro Tip: Prioritize fast movers in every shipment. Space spent on a slow SKU is space a bestseller can’t use.
6. Timing and planning around the monthly cycle
Amazon announces monthly limits and provides estimates for the following two months. Plan against those estimates rather than waiting for the final number.
Limits are not fixed. They shift with performance and network needs, and mid-2025 guidance showed Amazon holding capacity at roughly five months of expected sales for June and July.
A practical planning routine:
- Request capacity early rather than at the deadline.
- Use early release when a request is approved.
- Line up promotions with capacity windows so a launch or peak never collides with a blocked shipment.
- Track restock limits too, since restock limits and storage costs work together.
7. Why capacity belongs in your forecasting and creative plans
Capacity is a planning constraint, not just an inventory chore. The brands that avoid emergency reservation bids treat it like budget: it sits in the demand forecast, the promo calendar and the launch plan from the start.
Healthy listings help too. Stronger images, copy and advertising lift conversion, and faster sell-through turns the same cubic feet into more revenue. When forecasting, creative and ads move together, you rarely need a costly last-minute request.
— Dan Katona
8. How we help you plan capacity and inventory
Capacity problems usually trace back to forecasting and operations, which is where we work. Our Marketplace Operations Management team handles day-to-day marketplace execution, and our forecasting and retail readiness work ties inventory plans to demand.
Here is what we bring to capacity planning:
- Unified inventory insight through our iDerive analytics platform.
- AWD strategy and replenishment planning that protects FBA space for fast movers.
- Coordinated peak planning across operations, creative and advertising.
The result is healthier sell-through and fewer scrambles for space, supported by detailed sales analytics for optimized decision-making. If you want a partner on this, explore our Amazon Growth & Optimization service and talk to our team about your capacity plan.
9. FAQ
Do open shipments count toward my FBA capacity limit?
Yes. Utilization includes on-hand inventory plus shipments you have created that have not yet arrived. A large inbound shipment can use space immediately.
Can I still ship if I’m over my limit?
Usually not. At or over the limit, Send to Amazon can block new shipment creation. Free space by removing slow units or moving bulk stock to AWD, or request more capacity in Capacity Manager.
How do performance credits offset reservation fees?
Sales generated by the extra capacity earn performance credits. Those credits can offset up to 100% of the reservation fee, so strong sell-through can make the added space effectively free.
Does AWD inventory count toward FBA limits?
No. Bulk inventory held in AWD does not count toward FBA storage limits. Auto-replenishment then moves stock into FBA as needed.
How often do capacity limits change?
Monthly. Amazon announces limits each month and provides estimates for the next two months, so plan around that cadence.
Sources
- Sellercentral
- Amazon announces new streamlined FBA capacity management system - Sell on Amazon
- Amazon FBA Capacity Limits June-July: What Sellers Need to Do | The Supply Chain Source
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