Enter demand and lead time averages and maximums to get safety stock and your reorder point.
Results update live as you type.
Enter values to calculate.
Safety stock is a buffer for two surprises: demand spiking above average, and suppliers delivering late. The formula sizes the buffer from the worst demand and worst lead time you have actually seen.
More buffer means fewer stockouts but more cash tied up. Review maximums quarterly: one freak week should not permanently inflate your buffer, and steady growth should raise averages.