First Pass Yield Calculator
Calculate First Pass Yield (FPY) and Rolled Throughput Yield (RTY) for multi-step processes.
How to Use the First Pass Yield Calculator
- Enter total units produced.
- Enter number of defective units.
- Enter number of process steps and click Calculate.
Use Cases
- •Manufacturing process improvement.
- •Six Sigma DMAIC measurement phase.
- •Production quality tracking.
Formula
Formula: FPY = (Total − Defective) / Total × 100%. RTY = FPY^n (for n equal process steps).
Frequently Asked Questions
What is First Pass Yield?
FPY is the percentage of units that pass through a process without requiring rework or rejection on the first attempt.
What is Rolled Throughput Yield?
RTY is the probability that a unit passes through all process steps without any defect. It compounds FPY across multiple steps.
Why does RTY matter?
RTY reveals hidden factory costs. A 95% FPY over 10 steps gives only 60% RTY, showing significant waste even with apparently high single-step yields.