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eng.tolerance-cpk Calculator
Calculates process capability indices (Cp and Cpk) from process mean, standard deviation, and specification limits. Cpk above 1.33 is the standard manufacturing goal (4σ process) — below 1.0 means the process is producing non-conforming parts.
Inputs
Usl
Reference formula or conversion factor shown for context.
Lsl
Reference formula or conversion factor shown for context.
Process Mean
Arithmetic average. Sensitive to outliers — if your data has extreme values, the median may be more representative.
Process Std
Reference formula or conversion factor shown for context.
Results
Cpk (process capability)
Reference formula or conversion factor shown for context.
Cp (potential capability)
Sample size or count used in the calculation.
process centering
Sample size or count used in the calculation.
sigma level
The measured or computed level on the applicable scale.
capability
Reference formula or conversion factor shown for context.