Free Process Capability (Cpk) Calculator — Excel

Paste your measurements, get Cp, Cpk and predicted yield in seconds. No formulas to build.

Is your process actually capable of meeting spec? Stop guessing.

This free Excel calculator turns a set of recorded measurements into an instant capability study. Enter your data and your spec limits (USL / LSL) and it returns:

- Cp, Cpk, CPU and CPL

- Predicted defect rate (PPM) and process Z

- A colour-coded verdict — capable, marginal, or not capable

- A distribution histogram of your data

Built by Qlause in a clean, professional template — no macros, no sign-up beyond your email. Works in Microsoft Excel.