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).
1. Your solution: my8data.com
Free Process Capability Calculator — Cp, Cpk, Pp, Ppk in 30 Seconds
Skip the broken Excel templates. Enter your measurements, get audit-ready Cpk results instantly — right in your browser.
- ✅ Cp, Cpk, Pp, Ppk + histogram & normality test — automatic
- ✅ One-click PDF report, ready for your IATF 16949 audit
- ✅ Free forever plan — no install, no macros, no IT ticket
Trusted by quality managers at
Why quality managers switch from Excel to my8data
Excel Cpk templates break. Formulas get corrupted, macros get blocked by IT, and every audit means hunting for the right file version. my8data fixes that.
| Excel Template | my8data.com |
|---|---|
| ❌ Manual setup, broken formulas | ✅ Paste values → instant results |
| ❌ No histogram, no normality test | ✅ Automatic histogram + probability plot |
| ❌ Screenshot for the audit binder | ✅ One-click PDF report |
| ❌ Files scattered across drives | ✅ All analyses saved & organized |
| ❌ No version control | ✅ Cloud-based, always up to date |
"We replaced our Excel Cpk template with my8data. PDF audit reports are now a one-click job — saves us about 4 hours per audit cycle."— Quality Manager, Tier-1 Automotive Supplier
_
2. Our 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.
-
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).