CPK to PPM Calculator
Convert process capability indices (Cpk) to defective parts per million (PPM) with our precise calculator
Process Capability (Cpk)
Process Quality Results
Enter your Cpk value to assess your process quality level.
Quality Benchmark
Your process quality assessment will appear here.
📊 Industry Quality Standards
| Quality Level | Cpk Range | PPM Defective | Sigma Level | Typical Applications |
|---|---|---|---|---|
| World Class | ≥ 2.0 | ≤ 0.001 | ≥ 6σ | Aerospace, Medical Devices |
| Excellent | 1.67 - 2.0 | 0.001 - 0.6 | 5σ - 6σ | Automotive, Electronics |
| Good | 1.33 - 1.67 | 0.6 - 63 | 4σ - 5σ | General Manufacturing |
| Marginal | 1.0 - 1.33 | 63 - 2700 | 3σ - 4σ | Some Service Industries |
| Poor | 0.83 - 1.0 | 2700 - 66000 | 2σ - 3σ | Basic Processes |
| Unacceptable | < 0.83 | > 66000 | < 2σ | Needs Immediate Improvement |
Note: These benchmarks assume a 1.5σ process shift (standard industry practice).
📈 Process Improvement Tips
Data Analysis
Use statistical process control (SPC) charts to monitor process variation and identify trends.
Reduce Variation
Implement techniques like Design of Experiments (DOE) to identify and reduce variation sources.
Center Process
Adjust process parameters to center the mean closer to the target value.
Equipment Maintenance
Regular preventive maintenance can reduce equipment-induced variation.
Operator Training
Invest in thorough training to minimize operator-induced variation.
Standardize Procedures
Document and enforce standardized work procedures to reduce variability.
Note: This calculator provides estimates based on normal distribution assumptions. Actual process performance may vary based on distribution shape and other factors. Always validate with your actual process data.