Calculators
Reorder Point Calculator
Calculate the reorder point from daily demand, lead time and safety stock, and the days until you need to reorder.
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The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Inventory replenishment
- Setting up reorder alerts
- Purchasing planning
- E-commerce stock management
About this tool
What the Reorder Point Calculator does
The reorder point is the stock level at which a new order should be placed so it arrives before stock runs out. It equals expected demand during the supplier’s lead time plus safety stock. Comparing it with current stock tells you when to order.
It also works as a inventory reorder point calculator.
Formula
- Reorder point = daily demand × lead time + safety stock
- Inventory position = on hand + on order
- Days until reorder = (position − reorder point) ÷ daily demand
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Average daily demand | 120 units |
| Lead time | 14 days |
| Safety stock | 400 units |
| Current stock on hand | 2,800 |
| Already on order | 0 |
| Result | Value |
|---|---|
| Reorder point | 2,080 |
| Status | Above reorder point |
| Days until reorder | 6.0 |
| Inventory position | 2,800 |
How to read the result
Use inventory position (including stock already on order), not just stock on hand, to avoid ordering twice.
Recalculate reorder points when demand trends or supplier lead times change.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
Multiply average daily demand by lead time in days and add safety stock.
Stock on hand plus stock on order, minus any backorders.
From demand and lead time variability and the service level you want; see the safety stock calculator.
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