Understanding First Pass Yield
How we calculate. FPY % = units passing first time ÷ units entering × 100. The form uses the same arithmetic as the worked examples on this page. See our methodology and accuracy policy.
Real-world scenario: A typical First Pass Yield case uses first-pass passes 920 and units entering 1000. Enter the same figures below to reproduce the worked path.
What is First Pass Yield?
A quality-flow KPI stronger than final yield when rework hides problems. Rolled throughput yield multiplies FPY across steps.
- No rework credit on first pass
- Entering count = process starts
- Pairs with scrap and quality rate
The Formula
Worked Example
Common Use Cases
- Lean quality: right-first-time
- Cell design: rework loops
- Supplier scorecards: incoming FPY
Pro Tips
- Don’t count rework as first pass
- Map each process step
- Watch inspection gate changes
Limitations: First Pass Yield results are educational manufacturing and lean/TPM planning aids—not process-safety, quality-system, or financial advice. Confirm definitions with your MES/SCADA and quality policies.
FAQ
FPY vs final yield?
Final yield can include reworked units that eventually pass. FPY only counts first-time success.
What if units entering is 0?
FPY is undefined—enter a positive entering count.
Authoritative References
For OEE and manufacturing KPI definitions, consult: