Tools for Amazon FBA Inventory Forecasting Made Simple
The best tools for Amazon FBA inventory forecasting predict demand, flag stockout and overstock risk, and time your reorders so you dodge Amazon's storage and low-stock penalties. The strongest 2026 picks are SoStocked, RestockPro, Helium 10, Jungle Scout, Inventory Planner, and Prediko. But every one of them only tells you when to reorder. Sellerview.ai tells you what is worth reordering, by showing real profit per SKU.
Key Takeaways
● Amazon FBA storage fees cost the average seller $2,400 to $18,000 per year (Nova Analytics).
● Standard-size storage jumps from $0.78 to $2.40 per cubic foot in Q4 (October to December), roughly 3x the off-peak rate.
● Aged inventory surcharges start at 181 days and climb to $6.90 or more per cubic foot once stock passes a year.
● The low-inventory-level fee hits when both your 30-day and 90-day supply drop below 28 days.
● Forecasting tools stop stockouts and overstock. A profit tool like Sellerview.ai tells you which SKUs actually deserve the restock.
At a Glance
FBA forecasting is a profit problem, not a stock problem
FBA (Fulfillment by Amazon) means you ship inventory into Amazon's warehouses, and Amazon picks, packs, ships, and handles returns. Convenient, yes. Free, no. Every unit sitting in those warehouses costs you money every single day, and storage fees alone run $2,400 to $18,000 a year for the average seller .
Here is the trap most sellers fall into. They eyeball their stock, guess a reorder quantity, and get it wrong in one of two directions. Guess low and you stock out, lose the Buy Box, watch your organic rank slide, and keep paying for ads that point at an unavailable listing. Guess high and you bleed margin to storage fees, aged surcharges, and a falling inventory score. Forecasting tools exist to kill that guesswork.
See what these rates actually cost your inventory below with Free Amazon FBA Profit Calculator
What overstock and stockouts actually cost you
Overstock is the quiet killer. Storage is billed per cubic foot every month, and in Q4 the standard-size rate roughly triples. Sit on inventory too long and the aged inventory surcharge stacks on top, starting at 181 days and climbing to $6.90 or more per cubic foot after a year. On top of that, a low IPI (Inventory Performance Index) below 400 gets your storage capacity capped.
Stockouts hurt differently. The moment you run dry, you can lose the Buy Box, your rank drops, and your PPC keeps spending on a listing nobody can buy. Amazon also charges a low-inventory-level fee when both your 30-day and 90-day supply fall under 28 days of cover. Good inventory management is the difference between these fees being a footnote and a margin leak.
Rates confirmed against Amazon Seller Central schedules via AMZ Prep, CommerceProfitLab, and Olimp Warehousing (2026). See Sources.
Placement note: this calculator placeholder sits inside the "What overstock and stockouts actually cost you" section, right after the storage-fee table - the peak-pain moment where a reader is thinking about cost per unit.
How the Six Tools Actually Compare
These six are the tools worth your time in 2026. Pricing changes often, so anything not publicly confirmed is marked "Varies" or "Contact vendor" - check the vendor before you buy. Sellerview.ai is not in this table on purpose: it is a profit tool, not a demand-forecasting tool, and it is covered on its own below.
Note: Forecastly (part of the former Viral Launch suite) shut down in late 2025 and is no longer active, so it is left off the list.
SoStocked (Carbon6)
SoStocked is the most customizable Amazon-native forecasting tool. It projects demand up to 12 months out using seasonality, trends, and planned promotions, and it generates purchase orders that factor in supplier lead times, shipping, and FBA capacity limits. Best for private-label brands with 50 or more SKUs. Its ProfitFlow add-on adds forward-looking profit, but per-SKU profit tracking is not its core job.
RestockPro (eComEngine)
RestockPro is laser-focused on the restock decision. It reads sales velocity, supplier lead times, and Amazon's storage limits, then tells you what to send and when, plus it flags SKUs at risk of the low-inventory-level and aged inventory fees. FBA-only and US-focused, from about $119 a month with a 21-day free trial.
Helium 10 - Inventory Management
Helium 10's inventory module lives inside its wider suite, so restock suggestions sit right next to your keyword and listing data. It is adequate for smaller catalogs but not as deep as a dedicated forecasting tool. Best if you already pay for Helium 10.
Jungle Scout - Inventory Manager
Jungle Scout's Inventory Manager pulls from your sales data and supplier lead times to forecast demand and recommend reorder quantities. It comes bundled in the higher-tier plans (around $79 a month), which makes it a good-value pick for sellers already inside the Jungle Scout ecosystem.
Inventory Planner (by Sage)
Inventory Planner does statistical demand forecasting built for mid-market, multi-channel brands running Amazon alongside Shopify and other channels. It is priced for scale, so contact the vendor for a quote. Best when Amazon is one of several sales channels, not your only one.
Prediko
Prediko ties forecasting, replenishment, and purchase orders into one automated workflow for Amazon and Shopify brands. Rather than surfacing a forecast and leaving you to act, it pushes the reorder process forward. Best for brands that want the restock loop mostly hands-off.
Forecasting tells you when to reorder. It won't tell you what to reorder.
Here is the gap every tool above shares. A forecast says "you will run out of SKU A in 18 days, reorder 500 units." It does not say whether SKU A actually makes money once you subtract the referral fee (Amazon's commission on each sale, usually 15%), FBA fulfillment, storage, returns, and ad spend. Plenty of sellers dutifully restock a SKU that quietly loses money on every unit.
That is where Sellerview.ai sits - on top of your forecast, not in place of it. Sellerview.ai shows real profit per SKU after Amazon fees, FBA costs, returns, and ad spend, and it separates ACoS (ad spend divided by ad sales) from TACoS (total ad spend divided by total sales) so you see which number is actually telling you the truth. So when your forecasting tool flags a restock, you can answer the question that matters: is this SKU worth the reorder, or is it eating 15% of my FBA capacity while contributing 3% of my profit?
The clean setup is a pair. Forecast units with SoStocked or RestockPro. Decide what deserves the reorder with Sellerview.ai. One tool protects you from running out. The other protects you from restocking a loser.
How to choose the right setup
● Amazon-only and want deep, custom forecasting: SoStocked.
● You just need accurate restock timing: RestockPro.
● Already paying for a suite: use the Helium 10 or Jungle Scout inventory module.
● Multi-channel or mid-market: Inventory Planner.
● You want profit clarity behind every reorder: add Sellerview.ai to whichever forecasting tool you pick.
The bottom line
A forecasting tool keeps you in stock. It will not keep you profitable. The sellers who win in 2026 pair accurate forecasts with a clear view of profit per SKU, so every reorder is a decision, not a reflex.
See your real profit per SKU.
FAQ
What are the best tools for Amazon FBA inventory forecasting?
The best tools for Amazon FBA inventory forecasting in 2026 are SoStocked, RestockPro, Helium 10, Jungle Scout, Inventory Planner, and Prediko. SoStocked is the most customizable, RestockPro is the most focused on restock timing, and the suite modules suit sellers already paying for Helium 10 or Jungle Scout. Pair any of them with Sellerview.ai for profit visibility.
How much do Amazon FBA storage fees cost in 2026?
Standard-size monthly storage runs $0.78 per cubic foot from January to September and $2.40 per cubic foot from October to December, roughly 3x in Q4. Oversize runs $0.56 to $1.40 per cubic foot. The average seller pays $2,400 to $18,000 a year in storage alone (Nova Analytics).
What is the aged inventory surcharge?
The aged inventory surcharge is an extra monthly fee Amazon charges on inventory that sits too long. It kicks in at 181 days and escalates the longer stock stays, reaching $6.90 or more per cubic foot once inventory passes a year. It is charged on top of your regular monthly storage fee.
Do I still need a profit tool if I already have a forecasting tool?
Yes. A forecasting tool tells you when to reorder and how much, but not whether the SKU makes money after fees, returns, and ad spend. Sellerview.ai fills that gap by showing real profit per SKU, so you only restock products that are actually worth restocking.
What is IPI and why does it matter for forecasting?
IPI (Inventory Performance Index) is Amazon's score for how efficiently you manage FBA stock. Keep it below 400 and Amazon can cap your storage capacity, which limits how much you can send in. Good forecasting keeps sell-through high and excess low, which protects your IPI.
Sources
● Total Amazon fees as share of revenue (34-45%), ShipSage - https://shipsage.com/amazon-fba-fees-2026/
● Tool landscape and pricing, Nova Analytics inventory tools review - https://novadata.io/resources/blog/best-amazon-inventory-management-tools
● RestockPro pricing and 21-day trial, ecombrainly - https://ecombrainly.com/best-amazon-inventory-management-software/
● Jungle Scout Inventory Manager plan detail, Profasee - https://profasee.com/blog/amazon-inventory-forecasting-tools/
Forecastly / Viral Launch discontinued, AMZ ToolHub - https://www.amztoolhub.com/categories/inventory-management