Definition
The multiplicative result of First Pass Yield across multiple processes, reflecting the overall yield level of the end-to-end flow; Danaher courseware often calls this multiplicative result FPY, while RTY is the common Six Sigma term; both are the same formula (see [[fpy]]).
In detail
Rolled Throughput Yield (RTY) is a metric for measuring the overall quality level of a multi-step process, calculated by multiplying the first-pass yields of each step. It addresses the problem that single-step yield cannot reflect end-to-end losses. Unlike final inspection yield, it more sensitively exposes hidden waste in the process. Typical output is an RTY percentage, used to identify process bottlenecks and improvement priorities.
Example in practice
When a production line has five processes with yields of 98%, 99%, 99.5%, 99.8%, and 99.3% respectively, RTY is calculated as approximately 95.7%, far below the highest single-process value. This signals to managers that they need to focus on cumulative loss across the entire Flow, so they can target low-yield processes for Kaizen.