About the Reorder Point Calculator
Reorder point (ROP) from average daily usage, lead time and safety stock — when to place the next order.
Also known as: rop calculator, when to reorder, inventory reorder level.
How to use this calculator
- Enter average daily usage, lead time, safety stock.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
ROP = daily usage × lead time + safety stock
Worked example
Using the values pre-filled in the calculator above:
- Average daily usage = 45
- Lead time = 7 days
- Safety stock = 120
the calculator returns:
- Reorder point: 435 units
- Lead-time demand: 315