Enter the upper specification limit, lower specification limit, standard deviation, and process mean into the calculator. The CPK calculator will evaluate and display the process capability index of those values.

## CPK Formula

The following formula is used to calculate the CPK, or process capability index, of a given set of data.

CPK = Min [(USL – mean/3 * std.),(mean-LSL/3*std.)]

- Where CPK is the process capability index
- USL is the upper limit
- LSL is the lower limit
- std is the standard deviation

How to calculate CPK

**First, determine the upper and lower limits.**These are the upper and lower limits of the specifications.

**Next, determine the mean of the data.**This is will be the average of all data points.

**Next, determine the standard deviation.**This should be the standard deviation of the sample set.

**Finally, calculate the CPK**Calculate the process capability index using the information from above and the euqation.

## FAQ

**What is CPK?**

CPK is a term that standards for process capability index. The process capability index is a value used to measure the ability of a process to produce to a customers specifications.

**How do you improve CPK?**

Improve CPK by moving the upper and lower limits closer to the mean.

## Related Terms

cpk calculator |

what is cpk |

how to calculate cpk |

cpk formula |

cp cpk formula |

what does a cpk of 1.33 mean |

cp cpk formula in excel |

process capability formula |

what is cp and cpk |

what is process capability |

ppk formula |

cp and cpk formula |

how to calculate cpk in excel |

cpk equation |

process capability index formula |

cp and cpk calculator |

cpk formula excel |

what does cpk mean |

how to calculate cp and cpk |

cp cpk excel |

how to calculate cpk and ppk in excel |

what is cpk value |

process capability calculator |

how to calculate process capability |

process capability index calculator |

calculate cpk in excel |

what is cpk in medical terms |

capability index formula |

process capability ratio formula |

what is cp cpk |

what does cpk measure |

pp ppk formula |

what is a good cpk value |

cp cpk pp ppk definition |

ppk calculator |

what is a good cpk |

how to calculate cpk value |

what is cpk in statistics |

cpk to ppm calculator |

how to calculate process capability index in excel |

what is process capability index |

what does a negative cpk indicate |

cp cpk calculator |

cpk to ppm conversion formula |

how to calculate process capability index |

how to calculate cp cpk |

cpk ppk formula |

cpk calculator online |

cpk defect rate calculator |

capability ratio formula |

what is cpk in manufacturing |

cpk value formula |

cpk to ppm conversion excel |

what does a low cpk value mean |

how to calculate ppk in excel |

capability index calculator |

capability calculator |

how to find cpk |

pp and ppk formula |

what cpk means |

how to calculate cpk for one sided specification |

cpk to ppm formula |

what is cpk in quality |

formula cpk excel |

cm cmk formula |

cpk what is it |

what is the cpk |

what is cpk medical term |

cp cpk pp ppk formula |

process capability equation |

what is process capability analysis |

what is a cpk value |

cpk computation |

process capability ratio calculator |

what is cp and cpk in quality |

cm cmk formula in excel |

formula of cp and cpk |

pp ppk formula in excel |

ppk formula excel |

calculate ppk in excel |

cp cpk template excel |

what is cpk in six sigma |

what is a capability study |

how to calculate cp cpk in excel |

how to calculate process capability in excel |

process capability calculator excel |

what does cp and cpk mean |

what is cpk in medicine |

how to determine process capability |

cpk and ppk formula |

how to calculate capability index |

how to compute cpk |

cp and cpk in excel |

cpk statistics formula |

calculate cpk formula |

cp formula in spc |

what is cp and cpk value |

standard value of cp and cpk |

calculate cp and cpk in excel |

what does cpk 1.33 mean |

what is cp in six sigma |

cpk what does it mean |

cpk cp formula |

cpk calc |

what does cpk |

what is cpk and cp |

what cpk |

what is the value of cp and cpk |

cpk ppk excel |

cpk 1.33 what does it mean |

process capability cpk formula |

how to find cp and cpk |

what is the process capability |

what should be included in a capability study |

ppk formula in excel |

cp cpk formula with example |

cpk formula example |

how to calculate cpk and ppk |

what does process capability mean |

what is process capability study |

how to find process capability |

excel calculate cpk |

what is cpk process capability |

how to calculate cpk in transport |

how to find cpk in excel |

cp cpk formula excel |

process capability sample size calculator |

what does cpk indicate |

what is the process capability index |

what is an acceptable cpk |

cp cpk excel sheet |

what is good cpk |

cpk index formula |

how to calculate ppm from cpk |

how to calculate pp and ppk |

pp ppk calculator |

ppm to cpk calculator |

cpk template excel |