BIZOMAT Tools · Manufacturing
Yield and First-pass Yield
How much good output are you getting from input?
Calculates final yield and first-pass yield and shows the rework burden.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Units started | units | Units started in the period |
| Good units | units | Good units after any rework |
| Good first time (no rework) | units | Units good first time without rework |
What each input means
Open an input to see what it is, its units, the worked example and the common mistakes, with a small diagram.
What this means: Units started
- What it is
- The number of units that entered the process in the period, whether they finished good, were reworked or were scrapped.
- Units and format
- Enter a number in units: a count of units. The form accepts 1 units or more.
- Example
- The form opens with 10000 units as a worked example. It is an illustration, not a recommended value: replace it with your own figure.
- Effect on the result
- Both yields fall as more units are started for the same good output.
- Get it right
- Count units started, not units finished; yields are measured against this.
What this means: Good units
- What it is
- Units that ended up acceptable, including those that needed rework to get there.
- Units and format
- Enter a number in units: a count of units. The form accepts 0 units or more.
- Example
- The form opens with 9600 units as a worked example. It is an illustration, not a recommended value: replace it with your own figure.
- Effect on the result
- Final yield is good ÷ started.
- Get it right
- It cannot exceed units started; the tool flags the data if it does.
What this means: Good first time (no rework)
- What it is
- Units that were acceptable the first time through, with no rework, repair or retest.
- Units and format
- Enter a number in units: a count of units. The form accepts 0 units or more.
- Example
- The form opens with 9400 units as a worked example. It is an illustration, not a recommended value: replace it with your own figure.
- Effect on the result
- First-pass yield is this ÷ started; good minus this gives reworked units.
- Get it right
- It cannot exceed good units; reworked units count in good, not here.
Method and formulas
- Final yield = good ÷ started
- First-pass yield = good first time ÷ started
- Reworked units = good − good first time
Limitations
- Single step; multiply step yields for rolled throughput yield
Typical uses
- Quality reporting
- Spotting hidden rework
Who it is for
- Quality engineers
- Production supervisors
What you get
- Final yield and first-pass yield
- Lost and reworked units
- Data checks
Interpreting the result
- A gap between final and first-pass yield is hidden cost and capacity
References
- Breyfogle F. W., Implementing Six Sigma (Wiley), first-pass and rolled throughput yield
Learn the Concepts Behind This Tool
These BIZOMAT Library readings explain the method this tool uses, with worked examples.
Method explained here · BIZOMAT original book
Defect density and the Poisson count
What it covers: Turning defect counts into a density per area, the Poisson model for counts on parts, comparing the counts it predicts with those found, and why defects per part misleads across part sizes.
BIZOMAT tools are screening and decision-support utilities. Verify important financial, engineering, safety, legal or operational decisions using appropriate professional standards and your organisation’s approved data.