Inventory calculator
Reorder Point Calculator
Know when to place the next order so you do not run out while waiting for stock. Your entered values stay out of analytics.
Formula and assumptions
Reorder point = average daily demand × lead time in days + safety stock.
- Daily demand and lead time are averages and stay steady.
- Use one unit throughout, for example units per day and days.
- Safety stock is the extra buffer you choose to hold.
- Shown to 2 decimal places. The whole-unit figure rounds up so you reorder slightly early rather than late.
Formula version 1.0, last reviewed 1 October 2026.
Frequently asked questions
What is a reorder point or reorder level?
It is the stock level at which you place a new order, so the new stock arrives before you run out.
What is safety stock?
Extra stock held to cover busier days or a late delivery. The Safety Stock Calculator can suggest a figure, and you can pass it straight to this page.
Why does the answer sometimes have a decimal?
Average demand is often not a whole number. The result also shows a figure rounded up to whole units, so you reorder slightly early rather than late.