Reorder Point Calculator

Calculate the exact inventory level at which you should place a new order, accounting for lead time demand and safety stock. Never stockout or overstock again.

Average Daily Sales (units)

Units sold per day on average

Max Daily Sales (units)

Peak daily demand (spikes)

Avg Supplier Lead Time (days)

Average days from order to receipt

Max Lead Time (days)

Worst-case delivery time

Service Level

Probability of not stocking out

Demand Std Dev (units/day)

Variability in daily demand

ROP = (Average Daily Sales × Average Lead Time) + Safety Stock. Safety stock uses a Z-score based on your chosen service level and demand variability. Place a new order when stock hits this level.