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eng.process-capability-Cpk Calculator
Calculates Cpk (process capability index) from process data and specification limits, classifying process capability as capable or incapable. Cpk accounts for both process variation and process centering — a process with Cp = 2.0 but Cpk = 0.5 has excessive centering error.
Inputs
Mean Measurement
Arithmetic average. Sensitive to outliers — if your data has extreme values, the median may be more representative.
Sigma Process
Average spread around the mean. In a normal distribution: 68% within ±1 SD, 95% within ±2 SD, 99.7% within ±3 SD.
Lsl
Reference formula or conversion factor shown for context.
Usl
Reference formula or conversion factor shown for context.
Results
Cpk
Reference formula or conversion factor shown for context.
Cp (potential capability)
Sample size or count used in the calculation.
CPU (upper)
Reference formula or conversion factor shown for context.
CPL (lower)
Reference formula or conversion factor shown for context.
Cpk = min(CPU, CPL)
Sample size or count used in the calculation.
classification
Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.