Logistics & production
Inventory reorder point Calculator
Set a stock trigger using demand, lead time, safety stock and commitments. This free inventory reorder point calculator shows the calculation and its assumptions so you can compare your own figures.
Your results
Set a stock trigger using demand, lead time, safety stock and commitments.
Calculated outcomes
- Lead Time Demand
- 400
- Units Below Reorder Point
- 60
Assumptions and estimates
- Inventory position includes on-order stock and subtracts allocated units. Reorder quantity is a separate policy; lead time and demand must share a day basis.
- Method: Reorder point = daily demand × lead time + safety stock. Inventory position = on hand + on order − allocated.
- This triggers ordering but does not set the order quantity. Lead time and daily demand must use a consistent calendar or working-day basis.
Useful next steps
- Use Compare options to test an alternative side by side.
- Copy, print or download a record of this calculation when you need one.
Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.
How the inventory reorder point calculation works
Reorder point = daily demand × lead time + safety stock. Inventory position = on hand + on order − allocated.
This triggers ordering but does not set the order quantity. Lead time and daily demand must use a consistent calendar or working-day basis.
Using this calculator
- Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
- Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
- Review reorder point and inventory position and reorder triggered, then read the stated assumptions and eligibility conditions before using the result.
Worked example
This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.
See example inputs
- Average daily unit demand
- 40
- Replenishment lead time (days)
- 10
- Safety stock units
- 100
- Units on hand
- 420
- Units already ordered
- 80
- Units allocated to customers
- 60
- Reorder Point
- 500
- Inventory Position
- 440
- Reorder Triggered
- Yes