Inventory Reorder Point Calculator
A reorder point estimates when to replenish inventory based on daily demand over supplier lead time and a chosen safety stock.
How to use this calculator
- Enter average daily demand, lead-time days and any safety stock already calculated.
- Check the labels and units before using a result outside this page.
- Change one input at a time if you want to compare scenarios.
Formula and method
Reorder point = average daily demand × lead-time days + safety stock
- Reorder point = average daily demand × lead-time days + safety stock
- This assumes the entered demand and lead time are representative; seasonality or supplier variability can require additional buffers.
Worked examples
Worked example
12 units daily, 5 lead-time days, and 20 units safety stock.
Reorder point = 12 × 5 + 20 = 80 units.
Reorder point = 12 × 5 + 20 = 80 units.
Understanding the result
A reorder point estimates when to replenish inventory based on daily demand over supplier lead time and a chosen safety stock.
This assumes the entered demand and lead time are representative; seasonality or supplier variability can require additional buffers.
Important notes
This assumes the entered demand and lead time are representative; seasonality or supplier variability can require additional buffers.
Displayed outputs are rounded for readability; preserve full precision when continuing a calculation.
Frequently asked questions
What does this reorder point calculator show?
A reorder point estimates when to replenish inventory based on daily demand over supplier lead time and a chosen safety stock.
Which inputs should I check first?
Enter average daily demand, lead-time days and any safety stock already calculated.
Can the result be used as a final professional specification?
This assumes the entered demand and lead time are representative; seasonality or supplier variability can require additional buffers.
Related calculators
- Safety Stock Calculator — Estimate buffer inventory using a service-level z value, demand variability and lead time.
- Inventory Days Calculator — Estimate days of inventory using average inventory value and cost of goods sold over a chosen period.
- Inventory Turnover Calculator — Estimate inventory turnover and days inventory on hand from cost of goods sold and average inventory value.
- Economic Order Quantity Calculator — Estimate a practical order lot size from annual demand, order cost and annual holding cost per unit.
- Break-Even Calculator — Find the break-even point for your business in units and revenue.
- Cost per Lead Calculator — Calculate campaign cost per lead from advertising spend and a consistent lead count.
Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate Break-Even Point — Learn the break-even formula for units and revenue and understand fixed costs, price, and variable costs.
- Percentage Change vs Percentage Difference — Understand the difference between percentage change and percentage difference, including when each formula is appropriate.
- Break-Even Point — Understand break-even point, contribution margin, and the basic unit break-even formula.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.