What are throughput yield (YTP) and rolled throughput yield (YRT)?

Throughput yield (YTP)

Throughput yield (YTP) is the number of good units that are produced divided by the total number of units that go into each step of the process. Throughput yield considers the amount of scrap and rework in a process.

When you calculate throughput yield, you count only the units that make it through the process without rework or scrap.

For example, you have a 3-step process for producing labels. The labels are printed, laminated, then cut. You want to calculate the throughput yield at each step of the process.
  1. First, 1000 labels go to the printing process, and 950 of the printed labels are acceptable. The throughput yield of the printing process is 95%.
  2. Then, 950 labels go to the laminating process, and 800 of the laminated labels are acceptable. The throughput yield of the laminating process is 84%.
  3. Finally, 800 labels go to the cutting process, and 700 of the cut labels are acceptable. The throughput yield of the cutting process is 88%.

Rolled throughput yield (YRT)

Rolled throughput yield (YRT) is the probability that a single unit can pass through the entire process without defects. You can multiply the individual throughput yields at each process step to obtain the overall, rolled throughput yield.

When you calculate throughput yield, you count only the units that make it through the process without rework or scrap.

Using the example above, YRT = YTP at step 1 * YTP at step 2 * YTP at step 3.

So the rolled throughput yield for the label process is 0.95 * 0.84 * 0.88 = 0.70. Overall, of the 1000 labels that entered the process, 700 labels are acceptable (700/1000 = 0.70).

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