![]() The upper limit of one of the dimensions on that product is 5 inches and the lower limit is 4 inches. In this example, we are looking at a product that needs to be made to certain specifications. The first step in calculating CPK (process capability index) is determining the upper and lower limits of the specifications. Where CPK is the process capability indexĬPK is defined as the process capability index and is a measure of the ability of a process to produce objects to a customer’s specifications.The following formula is used to calculate the CPK, or process capability index, of a given set of data.ĬPK = Min The CPK calculator will evaluate and display the process capability index of those values. Enter the upper specification limit, lower specification limit, standard deviation, and process mean into the calculator.
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