Process Capability Index Calculator

Given here is the free online process capability index calculator to do a Cp and Cpk calculation for the given data. Enter the upper specification limit, lower specification limit (LSL), process standard deviation and process mean in the process capability ratio calculator know the result.

Cp and Cpk Calculation

Given here is the free online process capability index calculator to do a Cp and Cpk calculation for the given data. Enter the upper specification limit, lower specification limit (LSL), process standard deviation and process mean in the process capability ratio calculator know the result.

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Formula :


Where, USL = Upper Specification Limit, LSL = Lower Specification Limit.

Use this free online process capability index calculator to know the potential Cp and the actual Cpk index for the given standard deviation and mean. CPK is also known as the Process Capability Index. This online Cp and Cpk calculator helps you to improve your process and to increase the output of the process within specification limits. The difference between Cp and Cpk is an indicator of how far the average of the process is from the target specification.

Process Capability Index: It also known as process capability ratio (Cpk) is the ability of a process to produce output within specification limits. It is a statistical measure of process capability which is used to analyze the process improvement efforts and used for processes under statistical control.

Example

A data set has LSL and USL of 3 and 5, SD and mean of 10 and 4. What is its Cp and Cpk value?
Cp = 5 - 3 / 6 x 10
=0.033.
Cpk = min [(5 - 4) / 3 x 10, (4-3) / 3 x 10]
= 0.033.

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