Cpk Calculator

Calculate Cp and Cpk process capability indices from measurement data and spec limits (USL/LSL).

Input Data

Separate values with commas, spaces, or newlines

What is Cpk?

Cpk (Process Capability Index) measures how well a process produces output within specification limits. Cp measures potential capability, while Cpk accounts for process centering. A Cpk of 1.33 or higher generally indicates adequate process capability.

Learn more: Cpk Encyclopedia