Plan
Reorder Point Calculator
Estimate a reorder point from average daily usage, supplier lead time and safety stock.
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The estimate is average daily usage multiplied by supplier lead time, plus the safety stock you entered. It is a planning threshold, not a purchase order.
Read the related guideReorder point formula
Reorder point = average daily demand × supplier lead time in days + safety stock. The units for daily demand and safety stock must refer to the same item and unit of measure.
For average demand of 8 units per day, a 6-day lead time and 20 units of safety stock, the estimated reorder point is 68 units.
Limits of the estimate
This basic formula assumes average demand and supplier lead time are useful planning inputs. It does not model demand variability, supplier delays, order quantities, open purchase orders or seasonality.
Treat the result as a stock threshold for review, not an automatic purchase instruction. Revisit the inputs when demand or supplier performance changes.
Related calculations: Profit Margin & Markup Calculator · Break-even Calculator
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The tool is intentionally simple. Open an answer only when you need it.
How does this tool work?
- Enter average units used or sold per day.
- Enter supplier lead time in days and optional safety stock.
- See the estimated stock level at which replenishment should be considered.
What is the reorder point formula?
A common basic formula is average daily usage multiplied by lead time, plus safety stock.
Does this create a purchase order automatically?
No. This calculator only estimates a planning threshold. Purchasing decisions still depend on stock, open orders, supplier constraints and business judgment.
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