Calculate lead time demand
Average daily demand
Lead time
Lead time demand
Lead time demand = Average daily demand × Lead time in days
Multiply average daily demand by supplier lead time to estimate units needed while waiting for the next order.
Inventory calculator
Reorder Point Calculator
Use this free reorder point calculator to estimate the stock level at which you should place a new order. Enter average daily demand, supplier lead time, and safety stock to calculate your reorder point. It is useful for avoiding stockouts, planning purchases, and keeping inventory available.
Lead time demand
140
Reorder point
190
Result overview
Average daily demand
20
Lead time
7
Demand during lead time
140
Demand during lead time
140
Safety stock
50
Reorder point
190
How to calculate reorder point
The reorder point tells you when to reorder before stock runs out. It combines the demand expected during supplier lead time with extra safety stock.
Calculate reorder point
Lead time demand
Safety stock
Reorder point
Reorder point = Lead time demand + Safety stock
Add safety stock to lead time demand to set the stock level that should trigger a new order.
How to use this calculator
- Enter your average daily demand
- Enter supplier lead time in days
- Enter your safety stock
- Review lead time demand
- Review the reorder point
Examples
Example 1
- Average daily demand
- 20 units
- Lead time
- 7 days
- Safety stock
- 50 units
- Lead time demand
- 140 units
- Reorder point
- 190 units
Example 2
- Average daily demand
- 100 units
- Lead time
- 10 days
- Safety stock
- 200 units
- Lead time demand
- 1,000 units
- Reorder point
- 1,200 units
Tips
Use realistic average demand, not only your best sales day.
Increase safety stock when supplier delays are common.
Review reorder points when demand changes seasonally.
Reorder point does not replace full inventory planning.
Track stock movements regularly to avoid late purchasing.
Want to manage stock before it runs out?
Gombo helps you manage stock, purchases, invoices, reporting, and business operations from one connected platform.