# Process Capability Ratio Calculator

Instructions: You can use this Process Capability Ratio Calculator, by providing the lower specification limit, the upper specification limit and the process standard deviation ($$\sigma$$) using the form below:

Lower Specification =
Upper Specification =
Process Standard Deviation $$\sigma$$ =

#### Process Capability Ratio Calculator

More about the Process Capability Calculator for you to have a better understanding of the results provided by this solver. The capability ratio of a process is a measure of the percentage of non-conforming elements produced by a process. The higher the capability ratio is, the lower the percentage of non-conforming produced by the process. The capability ratio is computed by using the following formula:

$C_p = \displaystyle \frac{\text{Upper Specification} - \text{Lower Specification}}{6\sigma}$

Notice that this capability ratio formula is used for the case that the process is centered. When the process is not centered, you should use a process capability index instead.

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