First Pass Yield Calculator
First-pass yield tracks the proportion of items that pass a process on the first attempt without rework.
How to use this calculator
- Enter the number passing the first attempt and total input units.
- Confirm that all inputs use the stated units and the same population, period or scope.
- Change one assumption at a time when comparing scenarios.
Formula used by the first pass yield calculator
FPY = first-pass good units ÷ units entering process × 100%
- FPY = first-pass good units ÷ units entering process × 100%
- Use consistent process boundaries and count reworked items as not first-pass if they failed initially.
- Inputs are validated against required ranges and outputs are rounded for readability.
Worked examples
Worked example
940 of 1,000 units pass on the first attempt.
First-pass yield is 94%.
First-pass yield is 94%.
Understanding the result
First-pass yield tracks the proportion of items that pass a process on the first attempt without rework.
Use consistent process boundaries and count reworked items as not first-pass if they failed initially.
Important notes
Use consistent process boundaries and count reworked items as not first-pass if they failed initially.
Use the result as a calculation aid for the inputs supplied; confirm critical specifications independently.
Frequently asked questions
How is it different from final yield?
Final yield may include units recovered through rework; first-pass yield does not.
Can FPY exceed 100%?
No; the passing count cannot exceed the input count.
How do I use this calculator?
Enter the number passing the first attempt and total input units.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.