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 Six Sigma Calculator
Process Sigma:  


The Sigma calculator illustrated here assumes a 1.5 sigma shift. You may modify this by using the Extended mode.

Additional Information:

How to calculate Six Sigma?

Step 1: Select the process, unit & requirements

  • Identify the process you want to evaluate
  • What is the primary ?product? made by this process?

We refer to this "product" as UNIT

  • Identify the key customer requirements for the unit         

Step 2: Define the Defect opportunities

  • Any failure to meet a customer requirement or performance standard is called a defect. eg. Poor paint job, wrong data etc
  • Identify the number of defects that could be found on a single unit. These are Defect Opportunities

Step 3: Gather Data and calculate DPMO

  • Count units produced and total defects
  • Calculate defects per million opportunities (DPMO)

Step 4: Convert DPMO to Sigma

  • Use the DPMO calculated in Step 3
  • In the conversion table below, scroll to the row that has a value closest to the DPMO calculated above
  • Find the corresponding Sigma value

See conversion table below

Alternate method

This method uses % rejection and % yield.         

1. Calculate the % rejection of the process.

2. Calculate final % yield

    Final % yield = 100 - (% rejection)

3. Use the %yield calculated in step 2

     In the conversion table, scroll to the row which has % yield closest to the above value . Find the corresponding sigma value

Other References:

Algorithm for inverse normal cumulative distribution function