When to use this calculator
Measure the share of process units accepted without rework. Units needing rework do not count as first-pass good units even if later accepted.
Explore the work & operations calculators for other questions in this topic. For a related calculation, use the Hourly Rate Calculator: Translate annual billable revenue needs into an hourly rate.
PUTTING IT INTO PRACTICE
First Pass Yield: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Units passing first time (integer) | 950 |
| Units entering process (integer) | 1,000 |
| Result | 95 % |
- Check the input labels and enter the example values above.
- Apply the relationship: FPY (%) = first-pass good units/input units × 100.
- The result is 95 %, rounded for display.
How to interpret your result
Units needing rework do not count as first-pass good units even if later accepted.
Keep output and labour measures tied to the same period. Capacity is an assumption that may depend on staffing and process conditions. Average productivity and turnover can conceal seasonal peaks and bottlenecks.
Frequently asked questions
Does more output per hour always mean better performance?
Not by itself. Quality, rework, safety, cost and constraints can change the practical value of a productivity increase.
When is the first pass yield calculator useful?
Measure the share of process units accepted without rework. Units needing rework do not count as first-pass good units even if later accepted.
How do I use the first pass yield calculator?
Enter units passing first time (integer), units entering process (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
FPY (%) = first-pass good units/input units × 100.
What should I check before using the result?
Units needing rework do not count as first-pass good units even if later accepted.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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