# Process Capability Ratio Calculator

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Instructions:
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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:

#### Process Capability Ratio Calculator

More about the
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Process Capability Calculator
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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:

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.