Quality worked example

First Pass Yield with total units of 600 units: a worked example

Suppose total units falls to 600 units. This page works the full calculation at that level so you can see exactly which result moves and by how much. Measure how many units pass the first time without rework.

The inputs for this scenario

  • Total units: 600 units (the input this scenario stresses; the baseline uses 1,200)
  • Passed first time: 1,090 units (held at the documented default)
  • Reworked units: 75 units (held at the documented default)
  • Failed / scrapped units: 35 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: First pass yield = passed first time รท total units.
  • First pass yield works out to 182 % at these inputs, and this is the headline figure for the scenario.
  • Rework rate works out to 12.5 % at these inputs.
  • Fail rate works out to 5.83 % at these inputs.
  • Final pass rate works out to 194 % at these inputs.

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 100% above the baseline at 182 %.
  • It computes the share of units that passed inspection on the first attempt, plus the rework rate, fail rate, and the final pass rate after rework. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • First pass yield: 182 % (headline result)
  • Rework rate: 12.5 %
  • Fail rate: 5.83 %
  • Final pass rate: 194 %

Run it with your numbers

  • To rerun this with your own numbers, open the live First Pass Yield calculator, set total units to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.