First Pass Yield & RTY Calculator
See how much throughput quietly leaks across a multi-step process. Enter units in and units passed first time for each step to get First Pass Yield and Rolled Throughput Yield. Your numbers stay in your browser.
Rolled Throughput Yield (RTY)
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How this is calculated
First Pass Yield (FPY) for a step is the share of units that pass that step correctly on the first attempt, with no rework, no scrap, and no retest.
Rolled Throughput Yield (RTY) multiplies every step yield together. It estimates the probability that a single unit makes it through the entire process with zero defects at any step.
Total defect escape is simply the complement of RTY, the share of units that need attention somewhere in the line.
Why RTY is lower than your final yield
- Final yield hides rework. A step can report a high yield after parts are reworked and retested. RTY counts only what passed the first time, so it exposes the hidden factory of rework.
- RTY compounds. Five steps at 98% each look healthy individually, but multiplied together they give a much lower rolled yield. Small losses stack up fast.
- Empty rows are ignored. A step is only counted when units in is greater than zero, so you can model two steps or five.
- Passed should not exceed units in. If it does, that step yield is over 100%, a sign of a counting or definition problem worth checking.
Yield is one lens on process health. To connect first pass losses to time and money, pair this with the cost of quality calculator and the scrap and rework cost calculator, and to see where capacity is really lost, start with the OEE calculator and the OEE calculation guide. For the broader improvement approach, see lean manufacturing.
Find the first pass losses hiding in your line
Harmony connects your machines, quality checks, and paperwork into one real-time operational layer, no rip-and-replace, so first pass failures and rework loops become visible as they happen instead of at month end. Read the CLS case study.
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