CPK Calculator

Find Process capability index (cpk)
Formula :
\(\begin{array}{l}cpk = min (\frac{USL-mean}{3\times std.Deviations} , \frac{mean-LSL}{3\times std.Deviations})\end{array} \)
Upper Specification Limit(USL) =

Lower Specification Limit(LSL) =

Process Standard Deviation =

Process Mean =

Potential Cpk =

Cpk Calculator is a free online tool that displays the process performance for the specified range. BYJU’S online Cpk calculator tool makes the calculation faster, and it calculates the performance of the process in a fraction of seconds.

How to Use the Cpk Calculator?

The procedure to use the Cpk calculator is as follows:

Step 1: Enter the lower limit, upper limit, the mean and standard deviation in the input fields

Step 2: Now click the button “Calculate” to get the Cpk

Step 3: Finally, the process performance will be displayed in the output field

What is Meant by Cpk?

In statistics, Cpk is a Process Capability Index which is used to measure the ability of the process in order to produce the output for the customer specification. Cpk gives the best scenario for the existing process and helps to estimate the future performance of the process. In simple words, Cpk is a tool which is used to estimate the producer capability to produce a product for the customer specification. The formula to calculate Cpk is given by:

Cpk = Min [(USL- Mean)/3σ, (Mean-LSL)/3σ]


USL  = Upper Specification Limit

LSL = Lower Specification Limit


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