# Rolled Throughput Yield (Y_{RT})

Categories: Lean Six Sigma Glossary, Resources

A Rolled Throughput Yield (Y_{RT}) is a percent that measures how many units “roll through” a process, first pass, without defects. This is a measure of internal efficiency where Y_{RT} estimates how likely a unit will go from input to output without requiring rework or scrap. Y_{RT} is calculated by determining the yield at each process phase, and then multiplying those yields by each other in decimal form. The resulting yield gives a more accurate assessment of internal waste as well as the odds of a customer experiencing an error.