Process Yield Calculator

Measure yield, rejects, rework, and recovery across every production stage. Track trends with confidence daily. Make smarter improvement decisions with fast, practical engineering insights.

Calculator Inputs

Total units entering the measured process or batch.
Units that failed inspection before correction or disposition.
Defective units sent through rework instead of immediate scrap.
Percent of reworked units recovered into acceptable output.
Units discarded immediately without rework attempt.
Used to estimate cost of poor quality from lost units.
Optional benchmark for comparing current performance.
Needed for DPMO and normalized defect comparison.
Total number of defects, not defective units alone.

Large screens show three columns, smaller screens show two, and mobile shows one. Percentage outputs are based on total processed units unless stated otherwise.

Formula Used

Metric Formula Meaning
Good Units on First Pass Total Units − Defective Units Units accepted without rework.
Recovered Rework Units Reworked Units × (Recovery Rate ÷ 100) Units saved after rework.
Final Good Units Good First Pass + Recovered Rework Units Total acceptable output after corrections.
First Pass Yield (Good First Pass ÷ Total Units) × 100 Yield before any rework activity.
Final Yield (Final Good Units ÷ Total Units) × 100 Yield after recovered rework is counted.
Scrap Rate ((Total Units − Final Good Units) ÷ Total Units) × 100 Total unrecovered process loss percentage.
Rework Rate (Reworked Units ÷ Total Units) × 100 Share of process flow requiring correction.
Recovery Efficiency (Recovered Rework Units ÷ Reworked Units) × 100 How effective rework activity is.
Cost of Poor Quality Effective Loss Units × Cost Per Unit Estimated value lost through unrecovered output.
DPU Total Defects ÷ Total Units Average defects found per unit.
DPMO (Total Defects ÷ (Total Units × Opportunities Per Unit)) × 1,000,000 Normalized defect intensity metric.
Rolled Throughput Yield Stage 1 × Stage 2 × ... × Stage N Chance that one unit clears all stages defect-free.

How to Use This Calculator

  1. Enter the total number of units processed during the measured period.
  2. Add defective units, reworked units, and direct scrap units from your inspection records.
  3. Enter rework recovery rate if you know how many reworked units become acceptable output.
  4. Optionally add cost per unit, target yield, defect opportunities, and observed defects for deeper analysis.
  5. Add stage yields if you want rolled throughput yield across multiple operations.
  6. Press the calculate button to see results above the form, export tables, and view the comparison graph.

Example Data Table

Example Input Value Example Output Value
Total Units Processed 1,000 Good Units on First Pass 880.00
Defective Units Detected 120 Recovered Rework Units 72.00
Reworked Units Attempted 90 Final Good Units 952.00
Rework Recovery Rate 80% First Pass Yield 88.00%
Direct Scrap Units 30 Final Yield 95.20%
Cost Per Unit $12.00 Scrap Rate 4.80%
Target Yield 98% Rework Rate 9.00%
Opportunities Per Unit 5 Recovery Efficiency 80.00%
Total Observed Defects 165 Cost of Poor Quality $576.00
Stage Yields 99%, 98%, 97%, 96% Rolled Throughput Yield 90.35%

FAQs

1. What is process yield?

Process yield is the percentage of input units that become acceptable final output. It shows how efficiently a process converts effort, time, and material into usable units.

2. What is the difference between first pass yield and final yield?

First pass yield counts only units that pass without rework. Final yield adds recovered reworked units, showing acceptable output after correction steps are completed.

3. Why should engineers track rework separately?

Rework hides waste. A process may still meet shipment needs, yet consume extra labor, inspection time, machine capacity, and material because defects needed correction.

4. What does rolled throughput yield show?

Rolled throughput yield multiplies stage yields together. It estimates the chance that one unit passes every major stage without defects, delay, or rework.

5. Can direct scrap and effective scrap be different?

Yes. Direct scrap is discarded immediately. Effective scrap also includes unrecovered rework and any remaining loss between total input and final good output.

6. What is DPMO?

DPMO means defects per million opportunities. It normalizes defect counts by total units and possible defect points, making performance easier to compare across products.

7. How often should process yield be reviewed?

Review yield every shift, batch, run, or reporting period. Frequent tracking helps engineers spot drift early and control scrap before losses grow.

8. Can this calculator support improvement projects?

Yes. Compare results before and after changes to quantify effects on first pass yield, final yield, scrap, rework, and poor quality cost.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.