Stock Reorder Point Calculator

Reorder Point = (Average Daily Sales × Supplier Lead Time in Days) + Safety Stock. It's the stock level at which a new order should be placed so the replacement stock arrives before you run out.

Safety stock should cover both demand variability (busier-than-average days) and supplier delays. A common starting approach is a few days' worth of average sales, adjusted up for items with unreliable suppliers or volatile demand.

Use your worst realistic lead time rather than the best case when calculating the reorder point, and lean on a larger safety stock buffer for items where lead time is unpredictable.

Not directly — this uses your average daily sales figure. For seasonal items, recalculate using the average daily sales expected during the upcoming season rather than a flat annual average.

Safety stock is the buffer you want left on the shelf when a new delivery arrives, to cover busy days or a late supplier. The reorder point is the stock level at which you place an order. It includes that buffer plus the stock you expect to sell while you wait for delivery. In this calculator, reorder point equals lead-time demand plus safety stock.

Add up the units of that item sold over a recent period, such as the last 30 days, and divide by the number of days. If your shop closes one day a week, either divide by the days you were open and count lead time in working days too, or use calendar days for both. Mixing the two makes the reorder point too high or too low.

Yes. Enter average daily usage instead of sales, such as kilograms of onions or litres of milk used per day, along with the supplier's lead time and a safety buffer. The fields are labelled in units, but any unit works as long as daily usage and safety stock use the same one.

The reorder point then equals lead-time demand, so on an average day the last unit sells just as the delivery arrives. A busier day or a late delivery means you run out. Zero safety stock can work for items you can buy locally the same day, or ones customers will not miss. For fast sellers, keep at least a day or two of sales as a buffer.