FBA Inventory Forecast Tool 2026

AMZ Prep’s tool is the top free choice for Amazon sellers. You get unlimited SKU processing, 95%+ accurate predictions, reorder recommendations, and storage fee alerts without signing up. It’s built by the team that handles over 100 million items each year across 50+ warehouses.

Download your FBA inventory report from Seller Central under Reports > Fulfillment > Inventory. Upload the CSV file, set your lead time and safety stock preferences, then review your stockout predictions and reorder recommendations. You can export the results to share with your team.

CSV files from Amazon Seller Central’s FBA Inventory reports work perfectly. Go to Reports > Fulfillment > Inventory to download. These files have everything needed – sales history, stock levels, and inbound shipments.

No limits. Whether you have 10 SKUs or 10,000, the tool handles them all instantly. There’s no upgrade needed and no slowdowns.

The tool looks at your current inventory, inbound shipments, sales velocity over 7/30/90 days, inventory age, sales rank, revenue from the last 30 days, storage costs, and past sales patterns. Everything gets analyzed together for better accuracy.

We see 95%+ accuracy because the tool examines sales velocity, inventory levels, inbound shipments, seasonal trends, and your lead times. You can trust these forecasts when making big purchasing decisions.

Yes. Upload at least 90 days of sales history (a full year works best) and the tool will spot seasonal patterns. It adjusts forecasts for things like Q4 holiday spikes or summer slowdowns.

Each SKU gets labeled: Out of Stock (zero units), Critical (14 days or less), Warning (15-30 days), Healthy (31-60 days), or Overstock (60+ days). This shows you which products need attention first.

The formula is: (Daily Velocity × Lead Time) + (Daily Velocity × Safety Buffer). This means you order enough to cover your lead time plus extra safety stock based on your settings.

Yes. The tool includes inbound inventory when calculating your available stock and days of supply. This gives you better stockout timing because it counts what’s already on the way to Amazon.

Stockouts hurt your rankings and lose sales. Overstock ties up cash in storage fees. When you run out, Amazon drops your ranking and it takes months to recover. When you have too much, you pay aging fees for products sitting past 271 days. Good forecasting keeps you balanced.

The tool shows you the exact date each SKU will run out, usually 14-21 days ahead. It factors in your lead time so you know when to order before hitting zero and losing your ranking.

Yes. It flags products with 60+ days of supply and shows inventory age across five periods. You can spot products approaching the 271-day and 365-day marks where Amazon charges higher fees.

It’s already counted. Just make sure your uploaded data includes in-transit shipments and the forecast will include them in stockout predictions and reorder timing.

Most sellers check weekly. Bump it up to 2-3 times per week during Q4, promotions, or with products that have unpredictable sales.

Amazon charges this fee when you keep less than 28 days of supply based on sales history. The tool flags when you’re getting close with Critical and Warning alerts.

Raise your safety stock buffer to 25-50% instead of 10-20%. The tool looks at velocity over 7, 30, and 90 days to smooth out bumps, but more buffers helps with unpredictable products.

You get daily sales velocity, days of supply left, stockout dates, reorder quantities, 30-day revenue per SKU, storage costs, inventory age in 5 segments, sales rank, and sales over 7/30/90 days.

Yes. One-click CSV download with all your SKUs, metrics, status labels, and reorder recommendations. Great for sharing with your team or suppliers.

Yes. It works for all Amazon marketplaces. Upload data from each marketplace separately – US, UK, Germany, etc. and get forecasts for each region’s patterns.

Total units sold divided by days in the period. The tool checks 7-day, 30-day, and 90-day velocity, finds trends, and uses the timeframe that fits your sales consistency best.

Yes. With 90+ days of history (ideally full year), the algorithm analyzes velocity changes over time to detect and account for seasonal demand patterns.

The tool works with partial data but accuracy improves with complete information. Missing sales history reduces velocity accuracy; missing inbound data may trigger premature warnings.

Yes. Global 3PL provider offering FBA prep, freight forwarding, DTC fulfillment, multi-channel logistics, cold storage, warehousing across 50+ locations processing 100M+ items annually.

We process 100M+ items annually across 50+ fulfillment centers. Our tool is built on real-world inventory management experience for thousands of Amazon sellers, not theory.

Yes. Maintained for compatibility with Amazon’s latest report formats, incorporates user feedback, refines algorithms, and adapts to changes in Amazon’s fee structures.

Yes. Processes only data from standard Seller Central reports. No API, no password sharing, no TOS violations. You control your data completely.

Industry-standard encryption. Files processed in real-time, not permanently stored. We never share, sell, or use your data beyond generating your forecast.