# How to calculate Sigma level?

Six Sigma – iSixSigma Forums General Forums Methodology How to calculate Sigma level?

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• #53782

Morales
Participant

Dear All,

I have calculated the DPMO of an exercise and now, I would like to know how to calculate the Sigma level, if possible.

The values I have are:

Defects: 120000
Opportunities (Units): 1500000
Defect Opportunities per unit: 10

DPMO: 8000

Based on the result, I would roughly say that the Sigma level would be between 3 and 4 but how can I know the exact level?

I will appreciate if you could support me with some ideas?

Many thanks,
William

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#191428

Strayer
Participant

C’mon now! Since you know DPMO just look it up in the table. Or use the calculator at this site.

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#191429

Morales
Participant

I have found the formula that could be used on excel in order to calculate the exact Sigma level and wanted to share this with you all.

=ABS(NORMSINV(DPMO/1000000))+1.5

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