Cp and CpK are process capability indices used to measure and analyze process capability. These are metrics related to continuous characteristics. The Cp value indicates the ratio of the tolerance width to the process spread (process range) or the potential process capability assuming exact centering within the tolerance window. It is calculated by dividing the difference between the upper and lower tolerance limits by the process range. The Cpk value focuses on precision and accuracy. It is the result of dividing the distance between the process mean and the nearest tolerance limit by half the width of the process range.