Supplier Lead Time Buffer Calculator

Calculate the number of safety stock days needed to protect against supplier lead time variability and demand spikes. Prevent stockouts without over-investing in working capital.

Avg Lead Time (days)

Normal days from PO to warehouse receipt

Max Lead Time (days)

Worst-case lead time you've experienced

Lead Time Std Dev (days)

Std deviation of lead times (estimate)

Avg Daily Demand (units)

Average units sold per day

Demand Std Dev (units/day)

Day-to-day demand variability

Service Level

Probability of not stocking out

Unit Cost ($)

For holding cost calculation

Annual Holding Rate (%)

Storage + capital cost % per year