Why Inventory Management Decides Your Margin
Most sellers pour energy into ads and traffic but ignore inventory—the "hidden profit pool." Stockouts drag down keyword rankings overnight, while long-term storage fees (LTSF) and excess inventory quietly erode margin.
The Four Dimensions of Your IPI Score
- Excess inventory percentage: fewer slow movers means a higher score.
- In-stock rate: keep best-selling ASINs available.
- Stranded inventory units: minimize "dead" stock.
- FBA sell-through rate: how fast you turn.
An IPI below 400 triggers storage limits—optimize 6–8 weeks before peak season.
How to Calculate Safety Stock
Safety stock = average daily sales × lead time (days) × safety factor (1.5–2 recommended). Example: 50 units/day, 30-day lead time, factor 1.8 → roughly 2,700 units of buffer.
A Three-Step Replenishment Cadence
- Weekly review: pull sales trends with Helium 10 or Jungle Scout.
- Tiered management: restock A-class winners every 2 weeks, C-class long-tail monthly.
- Alert system: trigger purchase when sellable days drop below 45.
Tool tip: pair SellerAIStack’s inventory-alert module with Helium 10’s Inventory Management for far more reliable monitoring than manual spreadsheets.
Pitfall Checklist
- Don’t wait until stock < 10; ocean freight lead time is 35+ days.
- Pre-stock 90 days before Q4 peak to avoid capacity caps.
- Use FBA Shipment Placement to cut split-shipment fees.