Calculate your FBA reorder point as: (Average Daily Sales × Lead Time in Days) + Safety Stock. Safety stock = Average Daily Sales × Number of Buffer Days (typically 7-14). Place reorders when inventory reaches this level to maintain continuous availability without overstocking.
Reorder Point = (Average Daily Sales × Lead Time) + Safety Stock. For example, if you sell 10 units/day with a 30-day lead time and 14 days safety stock: Reorder at (10 × 30) + (10 × 14) = 440 units.
Safety stock is extra inventory held as a buffer against demand spikes or supply delays. Calculate as: Average Daily Sales × Buffer Days. Most FBA sellers use 7-14 days of buffer stock, increasing to 21-30 days during Q4 peak season.
Lead time includes manufacturing time, shipping to your location or prep center, prep and labeling time, shipping to Amazon FBA warehouse, and Amazon receiving/check-in time (typically 5-14 days). Track each component to build an accurate total.
Adjust reorder quantities based on seasonal demand patterns. Analyze year-over-year sales data, increase safety stock 30-60 days before peak periods (Q4, Prime Day), and reduce orders heading into slow seasons to avoid excess storage fees.
Use Amazon's Restock Inventory Report as a starting point. Third-party tools like SoStocked, RestockPro, and Forecastly provide more advanced demand forecasting, multi-SKU management, and automated reorder alerts.
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