Transformers, Coils & Magnetics Manufacturing worked example

Yield Loss at 99% target first-pass yield: a worked example in transformers, coils & magnetics manufacturing

Push target first-pass yield up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when yield loss in transformers, coils and magnetics manufacturing needs a clean rate and gap-to-target you can put on a tier board.

The inputs for this scenario

  • Coils rejected or reworked: 8 units (unchanged)
  • Total coils wound in batch: 250 units (unchanged)
  • Target first-pass yield: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Yield Loss rate = affected amount รท total amount) to the inputs above produces each figure below.
  • At this operating point the engine returns 3.2 % for rate, the number this scenario is built around.
  • At this operating point the engine returns 95.8 points for gap to target.
  • At this operating point the engine returns 8 count for affected count.
  • At this operating point the engine returns 250 count for total count.

How this compares with the baseline

  • Against the tool's baseline example, where target first-pass yield sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • It computes the yield-loss rate by dividing rejected units by total units, and reports how many points that rate sits below your target yield. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Rate: 3.2 % (headline result)
  • Gap to target: 95.8 points
  • Affected count: 8 count
  • Total count: 250 count

Run it with your numbers

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

Last reviewed 2026-05-12.