Logan

What’s your email add?

Process Sigma = NORMSINV(1-((Total Defects) / (Total Opportunities))) + 1.5Cpk=Process Sigma / 3Before doing such a conversion, please make sure two things:1) Process is stable/under control2) Samples were collected randomly

Try this http://www.isixsigma.com/library/content/c020507a.asp 
You will find all the calculations at the bottom of the page.
A handy calcualtor may help. You can find out more from download.com http://download.com.com/3120-20-0.html?qt=six+sigma&tg=dl-2001&search=+Go%21+