Process Capability Analysis Platform
Process capability analysis built for quality and manufacturing teams.
Calculate Cp and Cpk in a clear, modern workspace designed for practical engineering review and day-to-day process decisions.
Practical workflow
CSV upload
Clear interpretation
Sample comparisons
Analysis Output
Capability overview
Review spread, centering, and next checks in a structured results view suitable for engineering work.
Process capable
The process appears capable for the current specification limits.
Next Best Actions
Turn this result into the next step
Keep momentum while the capability result is fresh. Review the interpretation, share the tool with a teammate, or support future improvements.
Distribution
Recommended next checks
- Continue routine monitoring.
- Confirm capability with time-based data and control charts.
- Keep tracking changes in process conditions and incoming material.
Formula reference
Cp = (USL - LSL) / (6 sigma)
CPU = (USL - Mean) / (3 sigma)
CPL = (Mean - LSL) / (3 sigma)
Cpk = min(CPU, CPL)
Raw data
| Value |
|---|
| 5.1 |
| 5.0 |
| 5.2 |
| 4.9 |
| 5.1 |
| 5.0 |
| 5.2 |
| 4.8 |
| 5.1 |
| 5.0 |
| 5.2 |
| 5.1 |
| 5.0 |
| 5.1 |
| 5.2 |
| 4.9 |
| 5.1 |
| 5.0 |
| 5.2 |
| 5.1 |
How to use this Cp and Cpk calculator
This process capability calculator is designed for engineers who need a quick way to evaluate whether a process can meet specification limits. Enter the upper specification limit and lower specification limit, then upload measured values from a CSV file. The calculator returns Cp, CPU, CPL, and Cpk so you can compare process spread and process centering in one place.
How to interpret process capability results
If Cp is high but Cpk is low, the process variation may be acceptable but the process mean is likely shifted toward one specification limit. If both Cp and Cpk are low, the process usually needs variation reduction before it can be considered capable. Reviewing both values together gives a more reliable view than using either metric alone.
Why engineers compare Cp vs Cpk
Cp tells you about potential capability when the process is centered. Cpk tells you about actual capability after centering is considered. That is why many teams search for Cp vs Cpk, what is a good Cpk, or how to calculate process capability before making decisions about machine setup, process adjustment, or customer reporting.
Frequently asked questions
What is a good Cp value?
Many teams look for Cp values above 1.33, but the right threshold depends on tolerance, customer expectations, and process risk.
What is a good Cpk value?
A Cpk of 1.33 is a common target in manufacturing, although some processes require higher capability depending on the application.
Can I calculate Cp and Cpk from sample data?
Yes. You can use the included sample datasets to compare a capable process, a shifted process, and a high-variation process before uploading your own CSV.
Do I need both Cp and Cpk?
Yes. Looking at both metrics helps you separate variation problems from centering problems, which leads to better process capability decisions.
Related process capability topics
After Cp and Cpk, many engineers move on to Pp and Ppk, control charts, measurement system analysis, and capability report examples. Expanding into those topics can help you build a stronger process capability workflow over time.
Learn how to calculate Cp and Cpk. Review the Cp formula. Read the guide to Pp and Ppk. Compare Pp vs Ppk.