Reorder Point Calculator
Calculate when inventory should be reordered using average daily usage, supplier lead time and safety stock.
Inventory Inputs
Enter your stock usage and replenishment details.
Reorder Analysis
Your result updates automatically as you enter values.
Enter your stock information
DIXANI will compare available stock with the calculated reorder point.
How the reorder point is calculated
The reorder point is the stock level at which a replenishment order should normally be placed.
How to use the Reorder Point Calculator
Enter daily usage
Use historical consumption or sales to estimate average daily demand.
Enter lead time
Use the typical supplier delivery time in days.
Add safety stock
Add a buffer for demand variation and delivery delays.
Review the result
DIXANI indicates whether you should reorder now, soon, or not yet.
Why Is the Reorder Point Important?
A reorder point helps determine when a replenishment order should be placed before available inventory runs too low. The calculation considers expected demand during supplier lead time together with safety stock.
For example, if an item uses 15 units per day and the supplier takes 7 days to deliver, expected lead-time demand is 105 units. With 30 units of safety stock, the reorder point becomes 135 units.
When available stock approaches or falls below this level, replenishment may need attention. Actual purchasing decisions should also consider open purchase orders, minimum order quantities, supplier schedules and expected changes in demand.
Reorder Point vs Safety Stock
Reorder point and safety stock are related inventory control measures, but they serve different purposes.
Safety stock is the extra inventory kept as a buffer against unexpected demand, supplier delays or other replenishment uncertainty.
Reorder point is the inventory level that signals when a replenishment order should normally be placed. It combines the expected demand during supplier lead time with the safety stock requirement.
For example, if an item normally uses 20 units per day, has a 5-day supplier lead time and requires 40 units of safety stock, the reorder point is 140 units:
This means the safety stock itself is 40 units, while 140 units is the level at which replenishment should normally be triggered. Keeping these two values separate helps avoid the common mistake of treating safety stock as the reorder point.
Common Reorder Point Mistakes
A reorder point is simple to calculate, but inaccurate input data can lead to unnecessary stockouts or excess inventory. The following are some common issues to check when setting reorder levels.
Using outdated demand
Average daily usage should reflect recent and representative demand. Seasonal changes, promotions or changes in customer demand can make an old average unreliable.
Underestimating supplier lead time
Using the supplier's best-case delivery time can result in ordering too late. Where possible, use a realistic lead time based on actual purchasing and receiving history.
Ignoring open purchase orders
Before placing another order, check confirmed incoming stock and existing purchase orders. This calculator allows incoming stock to be included when evaluating the current reorder status.
Keeping the same safety stock indefinitely
Safety stock may need adjustment when demand variability, supplier reliability or replenishment lead time changes. Review buffer stock periodically rather than treating it as a permanent fixed value.
Reorder points should therefore be reviewed periodically using current demand, supplier performance and inventory data. For important or high-value items, the calculated reorder point should be considered together with minimum order quantities, purchasing schedules, storage capacity and expected changes in demand.
Reorder Point Calculator — Frequently Asked Questions
What is a reorder point?
A reorder point is the inventory level at which a new purchase or replenishment order should be placed.
Does the reorder point include safety stock?
Yes. This calculator adds safety stock to expected demand during lead time.
What if available stock is below the reorder point?
The tool will flag that the item needs reorder attention. You should also consider open purchase orders, supplier limits and minimum order quantities.