SQC Online

Process Capability Index (Cp, Cpk)

These calculators compute the process capability index which shows the process potential of meeting the specifications. Enter the process parameters and specifications in one of the following tables, depending on whether you have a double-sided or single-sided specification.

Double sided specification:

Enter your process parameters:

Upper Specification Limit (USL)

 

Lower Specification Limit (LSL)

 

Process Standard deviation (σ)

If unknown, enter an estimate.

Process mean (μ)

Only if process is not centered

Upper specification only:

Enter your process parameters:

Upper Specification Limit (USL)

 

Process mean (μ)

If unknown, enter an estimate.

Process standard deviation (σ)

If unknown, enter an estimate.

Lower specification only:

Enter your process parameters:

Lower Specification Limit (LSL)

 

Process mean (μ)

If unknown, enter an estimate.

Standard deviation (σ)

If unknown, enter an estimate.

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