Service level and how is it measured?

• A. The probability or percentage of demand met without stockouts over a period, often cycle service level or fill rate
• B. Inventory turnover per year
• C. On-time delivery percentage
• D. Backorder rate

Answer: (A)

Service level is about how often you can meet customer demand from stock without running into a stockout. It’s measured as the probability or percentage of demand that is satisfied without stockouts over a given period, and the common ways to quantify it are cycle service level or fill rate. Cycle service level looks at the chance that no stockout occurs during a replenishment cycle, while fill rate asks what fraction of total demand is filled directly from stock. These metrics focus on stock availability and the ability to meet demand, which is exactly what service level captures.

Inventory turnover per year, on-time delivery, and backorder rate track different aspects: turnover measures how quickly inventory is used, on-time delivery assesses delivery punctuality, and backorder rate indicates how often orders cannot be filled immediately. While related, they do not define or measure the probability that demand is met without a stockout in the same direct way.