Free tool
First Pass Yield (FPY) calculator
What share of units were right the first time — no rework, no second pass.
FPY is stricter than a simple scrap rate — a reworked-and-passed unit still counts against FPY, since it wasn’t right the first time. It feeds directly into OEE’s Quality component.
How the calculation works
First Pass Yield (FPY) = units passing inspection without rework ÷ total units started, expressed as a percentage. The key word is “without rework” — a unit that failed inspection, got reworked, and passed the second time still counts against FPY.
That’s what makes FPY stricter and more honest than a plain scrap rate, which only counts units that were rejected outright. A process can have near-zero scrap and still have a real quality problem if a large share of units need a second pass to pass at all — rework hides in labor and cycle time, not in a scrap bin.
FPY is the more rigorous read on the Quality component behind OEE: OEE’s Quality figure (good parts ÷ total parts) should be defined the same “right first time” way FPY is, not loosened to include reworked units.
This calculator is for one run entered by hand. ThingConnect tracks pass/rework/scrap outcomes continuously from inspection and controller data, so a slipping FPY on a specific part number or shift is visible immediately, not discovered at month-end.