How to use this reorder point calculator
Use this reorder point calculator before buying inventory. Enter average daily unit sales, lead time, safety stock, and current stock. The tool shows the unit level where you should reorder and whether the current stock position is already risky.
- Use recent daily sales for stable products.
- Use peak-season daily sales before Q4 or Prime Day.
- Include supplier, freight, prep, and Amazon receiving days.
Reorder point formula
The reorder point formula is daily unit sales multiplied by lead time, plus safety stock. If a product sells 32 units per day and needs 35 days to replenish, lead-time demand is 1,120 units before safety stock.
Safety stock protects the account when demand rises or shipments arrive late. It is not wasted stock. It is the buffer that keeps ads and organic rank from collapsing during delays.
When to reorder
Order before inventory falls below the reorder point. Waiting until the warning appears inside Seller Central is often too late. Amazon receiving delays can turn a normal purchase order into a stockout.
- Order earlier when the SKU is seasonal.
- Order earlier when lead time is unstable.
- Reduce safety stock only after demand becomes predictable.
Frequently Asked Questions
What is a reorder point?
A reorder point is the inventory level where you should place the next order before stock runs out.
Does this include Amazon receiving delays?
Yes, if you include those delays in lead time. Use supplier, freight, prep, and Amazon receiving time together.
How much safety stock should I use?
Use enough safety stock to cover demand spikes and delayed shipments. Fast-moving SKUs need a larger buffer.