KEVOS® 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.
Open the calculatorRuns in your browser. No account needed.
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 KEVOS® Library readings explain the method this tool uses, with worked examples.
Method explained here · KEVOS® 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.
KEVOS® 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.