Formula used
Reorder point = average daily demand x lead time days + safety stock. Inventory position includes current stock plus incoming stock.
Search intent: Users want to know when to reorder inventory.
Reorder Point Calculator for Small Sellers
Use this reorder point calculator when you know current stock, average daily sales, and supplier lead time. It calculates safety stock, reorder point, days remaining, and suggested reorder quantity with visible formulas. Try one SKU here, then upload a CSV when you need to rank many products.
Single-SKU calculator
How the calculation works
When to reorder
A SKU is marked Reorder now when inventory position is below the reorder point or current stock may run out before the supplier lead time.
Limits
This is a formula calculator. It does not know future promotions, supplier capacity, cash limits, or seasonality unless your inputs reflect them.
Input fields explained
| Field | Why it matters |
|---|---|
| current_stock | Units available to sell right now. |
| average_daily_sales | Typical units sold per day. If blank, use recent sales totals in CSV mode. |
| lead_time_days | How many days replenishment usually takes. |
| incoming_stock | Units already ordered and expected to arrive. |
| minimum_order_quantity | Supplier MOQ used to round the suggested reorder quantity. |
Worked example
If a SKU sells 4.5 units/day, supplier lead time is 21 days, and safety stock is 31 units, reorder point = 4.5 x 21 + 31 = 126 units. If inventory position is 32 units, the SKU is Reorder now.
Common mistakes
- Using current stock only and forgetting incoming purchase orders.
- Using monthly sales as daily sales.
- Choosing a high service level for every SKU without considering cash tied up in inventory.
When not to rely on the result
Do not rely on the result alone when a promotion, supplier holiday, marketplace ranking change, or cash limit is likely to change demand or replenishment.
FAQ
What is a reorder point?
It is the inventory position where you should place a replenishment order before stock runs out.
Does incoming stock count?
Yes. Inventory position is current stock plus incoming stock, so open purchase orders reduce the suggested reorder quantity.
Can I calculate more than one SKU?
Yes. Use the CSV calculator to process multiple products and export the result table.