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# Process Sigma

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Equation / Last modified by Administrator on 2016/08/14 07:05
`"Process "sigma = `

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ID

pro.Process Sigma

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907da7d3-5fed-11e6-9770-bc764e2038f2

The **Process Sigma** calculator compute the process sigma of defects based on the observed total number of defects (tD) and the observed total number of opportunities (tO). Click **HERE for Process Yield** .

This is based on the formula for number of standard deviations (sigma), where:

`sigma = 0.8406 + sqrt(29.37 - (2.221 * log(DPMO)))`

where DPMO = (tD/tO) * 1,000,000

and tD is the total number of defects, and

tO is the total number of opportunities.

### Instructions

Enter the following:

- (tD) This is the total defects
- (tO) This is the total opportunities