The percentage of products or services without defects is the yield. Based on the Sigma Process Table, the Six Sigma Rating is predicted to yield 99.99966 percent. The opportunity, on the other hand, is the total number of probabilities for failure. We must compute the total number of defects, the total number of opportunities, and the defect rate to calculate the process sigma rating.Ī defect is something beyond the requirements of the customer. To assess whether the process capability is relative to the process specifications, the Sigma Process rating should be determined. To get an appreciation of the numbers involved, here’s the full scale: Sigma Level They’re working at 5 Sigma, 4 Sigma, or worse. If you have a Six Sigma process running, you have almost removed all the defects - it’s almost fine. Yield= 1-0.006=0.994 Six Sigma CalculationsĪ Production process must produce less than 3.44 defects per 1,000,000 opportunities in order to achieve a Six Sigma level. Yield: Yield is specified as a percentage of net commitments over the total number of opportunities.A process may have several possibilities for error per occurrence.ĭPMO = DefectsTotal number of units * opportunities per unit * 106 It is a measure of the number of errors occurring in a business or process. DPMO: DPMO is Defects Per Million Opportunities.It is a metric indicating the number of defects per opportunity in a process.ĭPO = Defects / (Total number of units * opportunities per unit)
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