Process capability is a measurable property of a process against the specification, expressed as a process capability index (e.g., Cpk or Cpm). The output of this measurement is usually illustrated by a chronological control sample, a histogram and calculations that predict how many parts will be produced out of specification (OOS).
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How to calculate cpk in excel
Two possibilitis:
- Excel template with Macro
- online calculation
1. Excel template with Macros
One way is to use the excel template with macros. You will get an excel template with:
- multilingual (german, englisch, italian, other languages possible)
- histogram, probabiltiy plot, chronological plot
- Excel template with macros .xlsm
- possibiltiy to format the cells, integrate the logo of your company, etc…………….
- with watermarks
To receive the template with watermarks as below, please send me your email address.
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2. Cpk online calculator
For a first overview you can calculate the Cmk online on this site. Just edit the values or delete the values and copy your own values from Excel via CTRL+V.
If you find it helpful, please share.
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Formula to calculate
The base for the cpk formula is described here.
For a more scientific look at process control, check out this discussion on the Minitab blog. Another option is to look at the ASQ homepage.
Please feel free to contact me, if you have any suggestions for improving this page (roland.schnurr@sixsigmablackbelt.de).
Sources:
[1] (MSA) Measurement System Analysis | AIAG“. https://www.aiag.org/quality/automotive-core-tools/msa (17. April 2022).
[2] „IATF 16949-2016 | AIAG“. https://www.aiag.org/quality/iatf-16949-2016 (17. April 2022).