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Reorder point & safety stock calculator
Enter how fast an item sells and how long your supplier takes. The calculator tells you the stock level to reorder at, how much safety stock to keep, how many days of stock you have left and roughly how much to order.
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Result
Enter your average daily sales and average lead time to see your reorder point. Or press Load a sample to see how it works.
Results are rounded up to whole units. Recalculate when your sales or supplier lead times change, and treat seasonal items separately.
The formula
How the reorder point is calculated
Reorder point = (average daily sales × average lead time) + safety stock.
Safety stock = (maximum daily sales × maximum lead time) − (average daily sales × average lead time).
Worked example: a pharmacy item sells 20 units on a normal day and 25 on a busy one. The distributor usually delivers in 5 days, but has taken 8. Safety stock is 25 × 8 − 20 × 5 = 100 units, and the reorder point is 20 × 5 + 100 = 200 units. With 260 units on the shelf, you have 3 days before you need to reorder.
Getting it right
Three mistakes that cause stock-outs
Using the supplier's promised lead time
Measure lead time from your own purchase orders and goods received notes. Promised and actual delivery times are rarely the same.
One reorder level for the whole year
Demand changes with seasons and promotions. Recalculate before busy periods, or you will run out exactly when customers want the item most.
Counting stock that is not really there
A reorder point only works if stock on hand is right. Regular counts, and expired or damaged stock written off, keep the starting figure honest.
Checking items one by one in a spreadsheet stops working at a few hundred items. See how inventory software tracks stock per location with re-order alerts, compare the best inventory management software in Pakistan, or read how batch and expiry tracking prevents write-offs.
FAQ
Reorder point questions
What is a reorder point?
The reorder point is the stock level at which you place the next order, so new stock arrives before you run out. It covers the sales you expect while the order is on its way, plus a safety stock for busy days and late deliveries.
How do you calculate the reorder point?
Reorder point = (average daily sales × average lead time in days) + safety stock. If an item sells 20 units a day, the supplier takes 5 days and you keep 100 units of safety stock, the reorder point is 20 × 5 + 100 = 200 units.
How do you calculate safety stock?
A common method is: safety stock = (maximum daily sales × maximum lead time) − (average daily sales × average lead time). With a busy day of 25 units and a slowest delivery of 8 days, that is 25 × 8 − 20 × 5 = 100 units.
What is lead time?
Lead time is the number of days from placing an order to having the stock on your shelf ready to sell — supplier processing, transport and receiving all included. Use your own records rather than the supplier's promise.
How often should I recalculate?
Whenever sales or supplier delivery times change noticeably, and at least each season. Seasonal items, such as Ramadan or winter stock, need their own figures for the season rather than a yearly average.
Does this calculator send my data anywhere?
No. Every calculation runs in your browser. Nothing is uploaded, stored or logged.
Can software set reorder levels for every item automatically?
Yes. Inventory software tracks stock per item and location and raises low-stock and re-order alerts, so you are told what to buy instead of checking hundreds of items by hand. AmalERP does this inside its inventory module, linked to purchasing and accounts.
Let your inventory tell you what to reorder
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