Rolled throughput yield

Rolled throughput yield (RTY) is the probability that a process with more than one step will produce a defect free unit. It is the product of yields for each process step of the entire process.

For any process, it is ideal for that process to produce its product without defects and without rework. Rolled throughput yield quantifies the cumulative effects of inefficiencies found throughout the process. Rolled throughput yield and rolled throughput yield loss (RTYL) are often used in Six Sigma.

Calculation

Rolled throughput yield is calculated by multiplying the yields of each process step. Calculations can become increasingly complicated as more parallel processes are introduced. It is first necessary to calculate the yield of each process step. We can estimate the yield of a process step by dividing units accepted by the number of units produced for that step. Suppose a process step produced 10 units and only 8 were good units. The yield of that step would be 8/10 or 0.80.