Process Capability Index (Cpk)
Calculator

Check also: Advanced Excel Cpk-calculator!

With this tool you can demonstrate relation between process capability Cpk and Yield. Enter test limits (LSL, USL) and as many samples as you like (up to 20).

Inputs

Limits
LSL
USL
 
Unit
 
Samples
Sample 1
Sample 2
Sample 3
Sample 4
Sample 5
Sample 6
Sample 7
Sample 8
Sample 9
Sample 10
Sample 11
Sample 12
Sample 13
Sample 14
Sample 15
Sample 16
Sample 17
Sample 18
Sample 19
Sample 20

Estimated Process Capabilities

Number of samples0
Mean (X)
Standard Deviation (s)
 
LSL
USL
 
Cpk
 Cpk (LSL)
 Cpk (USL)
 
Yield %
 Failed LSL %
 Failed USL %
 

Note: The accuracy of Cpk depends very much on sample size. With this calculator you can get only a rough estimate of process capability and Yield.


Example of Normal Distribution  

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