iSixSigma

Yield to Sigma Conversion Table

Yield %SigmaDefects Per Million
Opportunities
99.99976.003.4
99.99955.925
99.99925.818
99.99905.7610
99.99805.6120
99.99705.5130
99.99605.4440
99.99305.3170
99.99005.22100
99.98505.12150
99.97705.00230
99.96704.91330
99.95204.80480
99.93204.70680
99.90404.60960
99.86504.501350
99.81404.401860
99.74504.302550
99.65404.203460
99.53404.104660
99.37904.006210
99.18103.908190
98.93003.8010700
98.61003.7013900
98.22003.6017800
97.73003.5022700
97.13003.4028700
96.41003.3035900
95.54003.2044600
94.52003.1054800
93.32003.0066800
91.92002.9080800
90.32002.8096800
88.50002.70115000
86.50002.60135000
84.20002.50158000
81.60002.40184000
78.80002.30212000
75.80002.20242000
72.60002.10274000
69.20002.00308000
65.60001.90344000
61.80001.80382000
58.00001.70420000
54.00001.60460000
50.00001.50500000
46.00001.40540000
43.00001.32570000
39.00001.22610000
35.00001.11650000
31.00001.00690000
28.00000.92720000
25.00000.83750000
22.00000.73780000
19.00000.62810000
16.00000.51840000
14.00000.42860000
12.00000.33880000
10.00000.22900000
8.00000.09920000
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Assumptions
No analysis would be complete without properly noting the assumptions made. In the above table, we have assumed that the standard sigma shift of 1.5 is appropriate (the process sigma calculator allows you to specify another value), the data is normally distributed, and the process is stable. In addition, the calculations are made with using one-tail values of the normal distribution.

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