Business
Economic order quantity
Estimate the order quantity that balances ordering and holding cost.
Calculators / Business / Inventory reorder point
Inventory reorder point calculator
Estimate when to reorder from demand during lead time plus safety stock.
On this page
Reorder point630units
Lead-time demand480units
Calculator controls
How to calculate
Estimate when to reorder from demand during lead time plus safety stock.
reorder point = average daily demand × lead time + safety stock
Worked example
Average daily demand: 40; Lead time (days): 12; Safety stock (units): 150.
Reorder point: 630 units; Lead-time demand: 480 units.
Assumptions and limits
Demand and supplier lead time can vary. Review service levels, seasonality, minimum order quantities, perishability, and open purchase orders.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate when to reorder from demand during lead time plus safety stock. The result follows the displayed formula and keeps every adjustable assumption visible.
When this tool is useful
Use this tool to plan quantities or compare scenarios before making a purchase or technical decision.
Understanding your inputs
| Input | What to enter |
|---|---|
| Average daily demand | Enter a number of at least 0 and no more than 1000000000000. |
| Lead time (days) | Enter a number of at least 0 and no more than 1000000000000. |
| Safety stock (units) | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
What can change the inventory reorder point result?
Demand and supplier lead time can vary. Review service levels, seasonality, minimum order quantities, perishability, and open purchase orders.
Should I round the inputs first?
No. Enter the best measurements available and round only the practical final quantity, such as full packs, boards, sheets, or components.