How to use this calculator
- Enter average daily demand in units, supplier lead time in days, safety stock in units.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Demand and lead-time estimates must use the same time basis. The safety buffer is supplied, not inferred.
Worked example
With average daily demand in units = 20, supplier lead time in days = 10, safety stock in units = 50, reorder point in units is approximately 250.
What the result means
This indicates the modeled inventory-position trigger, which may include stock on order less backorders.
Common questions
How should I interpret reorder point in units?
This indicates the modeled inventory-position trigger, which may include stock on order less backorders.
What should I check before using this result?
Demand and lead-time estimates must use the same time basis. The safety buffer is supplied, not inferred.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.