Enter your data
Result
Enter values and calculate.
Cp/Cpk/Cpm assume a stable process and are conventionally interpreted under approximate normality. Cpm also uses the entered target.
How to use this calculator
What to enter
Enter or select the following as requested: LSL; USL; Process mean; Standard deviation; Target. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
Cp compares specification width with process variation. Cpk also considers how close the process mean is to the specification limits. Interpret these indices only when the process and variation estimates are suitable.
When to use it
Use this to analyze process quality or plan a quality-improvement study. Verify data collection and statistical assumptions before changing a process or reporting formal capability results.