Quality worked example

First Pass Yield with total units of 3,000 units: a worked example

This scenario runs the first pass yield calculation on the strong side: total units of 3,000 units, with every other input held at its documented default. Use when rework hides process quality problems.

The inputs for this scenario

  • Total units: 3,000 units (raised for this scenario; the documented default is 1,200)
  • Passed first time: 1,090 units (unchanged)
  • Reworked units: 75 units (unchanged)
  • Failed / scrapped units: 35 units (unchanged)

Working through the calculation

  • Applying the documented formula (First pass yield = passed first time รท total units) to the inputs above produces each figure below.
  • At this operating point the engine returns 36.33 % for first pass yield, the number this scenario is built around.
  • At this operating point the engine returns 2.5 % for rework rate.
  • At this operating point the engine returns 1.17 % for fail rate.
  • At this operating point the engine returns 38.83 % for final pass rate.

How this compares with the baseline

  • Against the tool's baseline example, where total units sits at 1,200 units and the headline result is 90.83 %, this scenario comes in 60% below the baseline at 36.33 %.
  • Use it whenever you want to measure true process capability and quantify the cost of rework that final yield hides. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • First pass yield: 36.33 % (headline result)
  • Rework rate: 2.5 %
  • Fail rate: 1.17 %
  • Final pass rate: 38.83 %

Run it with your numbers

  • Every input above is editable in the live First Pass Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.