Amazon Prime Day 2026 runs from June 23 to 26. And as always, there’s the ever-ending question of how to go about Prime Day inventory management.
Order too little and you miss a shot at the event. Order too much and you risk getting extra charges from Amazon while trying to figure out a way to sell those excess units fast.
The right amount comes from your historical sales data, product type and other factors you must consider. That’s why we’ve built this article that covers all you need to know about Amazon Prime Day inventory management.
There Is No Magic Inventory Multiplier
When Prime Day is close, it’s very common to see “inventory multipliers” getting around social media and blog posts. The reality is that there is no magic multiplier that determines how many units you need in order to be fully prepared for Prime Day. Why?
- Every seller is in a unique scenario. Either because of the category they’re in, how long they’ve been selling on Amazon or how much they have been growing in the past year.
- Each seller has a different budget for ad campaigns. This always has a direct impact on sales velocity and the calculations you can make to foresee it.
- There’s also the fact that some may source their products directly from the US, while others may do so from China or other countries. This directly impacts the level of preparation needed for Prime Day since freight times are different.
Borrowing someone else’s multiplier is how brands end up buried in stock or sold out mid event. You have to make it yourself.
Related article:
Calculating Orders: Start With Your Own Numbers
Your forecast depends on what data you already have. There are two main situations that determine what to do next:
You have sold during a past Prime Day
If this isn’t your first Prime Day, open Business Reports in Seller Central and pull your unit velocity from the last event.
Set that figure next to your current daily sales, then adjust the old event numbers to reflect where the business sits now. This will give you a general picture of what you can expect from the event.
You can also use the following formula to plan your next orders:
This is your first Prime Day
If this is your first Prime Day, we recommend looking at your competitors. The idea is to see how they’ve managed to go through the event in past years. And to better understand what kind of demand you’ll be facing.
A tool like Keepa, shows the price and sales rank history of your top three to five rivals, so you can see what they ran last year and how demand moved in your category. This leads us to our next topic.
The Importance of Knowing Your Demand Type
Much of what you can expect from Prime Day directly depends on your product and category. Two brands with the same daily sales can require very different stock levels.
You have to think about how customers engage with your product. Is it compatible with impulse purchases? Or is it harder for you to reach new customers?
Some products compatible with impulse purchases are children’s toys, beauty products, and tech gadgets. These usually face a big spike in sales during Prime Day, then fall off fast once it ends.
Related article:
Think about whether your product is one that shoppers put in a cart and wait for a discount. If this is your case, plan for a sales peak that aligns with your relevance, followed by a quick drop after June 26.
Meanwhile, replenishable products like supplements or coffee capsules don’t see such spikes but continue selling after the event because buyers reorder when they run low. Plan for a slower curve that runs past the four days.
Related article:
Adobe’s 2025 category data shows how uneven the spike gets. Appliances ran 112% above their June daily average during the event. Electronics hit 95%, office supplies 105%, baby and toddler goods 55%.
Pick Your Prime Day Products
Very few brands have the resources to support their complete catalog during Prime Day. Remember this means optimizing listings, getting approved to run deals for most of them and, most importantly, advertising the catalog with a very large budget to compete against the increased CPCs.
A smaller brand cannot prepare its whole catalog. Make a short list of the main SKUs that you’ll be advertising during Prime Day 2026. Three factors to decide the list:
- Sales history and reviews: Start with products that already convert and hold solid ratings.
- Margin after the cut: Check that each one still makes money once you subtract the discount, fees, and ad spend.
- Stock: Favor products you can keep available through the event and the weeks that follow.
Bundling related products fits here too. A virtual bundle can really increase conversions during high-traffic events like Prime Day.
Use Amazon Forecast
The FBA Inventory section has a Demand Forecast with Amazon’s own sales prediction, including the bump it expects around events.
Plus, the Days of Supply report tells you how long your stock will last at your current sales rate, counting units on hand, reserved units, and inbound shipments. Run both against the forecast you built yourself.
How your Amazon Forecast for Prime Day should look if you have a product compatible with impulse purchases:
How your Amazon Forecast for Prime Day should look like if conversions will increase, but at a much slower pace:
- Note: Amazon’s algorithm reads broad patterns and misses what you know about your own buyers. Use both.
Check Your Restock First
A forecast only matters if Amazon lets you ship that many units in. Your Inventory Performance Index shows you exactly where the Restock Limit is. The objective is to stay above the maximum shipment limit. Like this:
If you exceed the limit, you won’t be able to send any more units until the excess disappears from Amazon’s fulfillment center. This is a poor situation to be in, in the middle of Prime Day 2026.
Reserve the extra space through Capacity Manager in advance. It stops Amazon from blocking your shipments during the event.
If Amazon Prime Day 2026 main dates have already passed and you are short in time, you have two real options:
- Air freight a top SKU or two
- Skip this event and point your full plan at the fall Big Deal Days.
The Real Cost of Getting It Wrong
Either overstocking or ordering too few units will cost you a lot when doing Prime Day inventory management.
A stockout does more damage than the sales you miss that day. Amazon flags the product as currently unavailable, your organic rank drops, your sales velocity breaks, and the shopper buys from a competitor.
And if you overstock, your costs will quickly rise. Amazon’s long-term storage surcharge now kicks in at 181 days instead of 271, three months earlier than before.
There is also a 3.5% fuel and logistics surcharge on FBA fulfillment fees as of April 2026, roughly $0.17 on a standard-size unit.
Add both to the true cost of every unit you ship.
Backup Plan Ideas
A solid Prime Day inventory management strategy still may need backup plans in case something goes the wrong way during the event. Some ideas:
- Keep an FBM SKU live for your top ASINs in case your FBA inventory runs dry.
- Clear stranded and suppressed listings now. A stranded listing cannot run a deal, show in search, or sell.
- Have your other channels in mind. If Multi-Channel Fulfillment ships your Shopify or other orders, those sales draw from the same FBA service.
Do Not Chase the Spike After the Event
A big Prime Day surge can inflate Amazon’s restock suggestions for weeks. Reorder straight off that post-event velocity and you end up holding summer stock that will not move. Let demand settle for two or three weeks before you commit to a large restock.
Conclusion
The real key to Prime Day inventory management lies in your metrics and historical data. Use them to forecast inventory exactly for your demand expectations and more.
Frequently Asked Questions About Prime Day Inventory Management (FAQs)
How much inventory should I have for Amazon Prime Day 2026?
There is no universal number or multiplier that works for every seller. The right inventory level depends on your historical sales, expected advertising spend, product category, lead times, and available storage capacity.
Should I stock my entire catalog for Prime Day?
Most brands see better results by focusing on a small group of high-performing SKUs. Prioritize products with strong conversion rates and healthy margins after discounts.
How far in advance should I send inventory to Amazon?
The earlier the better, especially if your products are sourced internationally.
Is Amazon’s Demand Forecast accurate?
Amazon’s forecast can be a useful reference, but it should not be your only planning tool.
What happens if I run out of stock during Prime Day?
A stockout can lead to lost sales, reduced organic rankings, lower sales velocity, and missed opportunities to acquire new customers. In many cases, the long-term impact extends beyond the event itself.
What happens if I overstock for Prime Day?
Excess inventory can increase storage costs and long-term storage fees. Overstocking may also force you to run additional discounts after the event to clear inventory that did not sell as expected.
Should I increase inventory based on post-Prime Day sales velocity?
Prime Day often creates a temporary sales spike that can distort forecasting models. Wait two to three weeks after the event to evaluate your true sales rate.
Ready for Amazon Prime Day 2026?
The wrong inventory decision can cost you thousands in missed sales or excess stock.
If you’re not completely confident in your Prime Day forecast, our Amazon experts can help you validate your numbers, identify risks, and build a strategy based on your business.
Fill out the form below to schedule a free consultation and get expert feedback on your Prime Day plan.