Six Sigma Fundamentals: A Complete Introduction to the System, Methods, and Tools
|
| Long-Term Yield | Long-Term Sigma | Short-Term Sigma | Defects Per 1,000,000 | Defects Per 10,000 | Defects Per 100 |
|---|---|---|---|---|---|
| 99.99966% | 4.5 | 6.0 | 3.4 | 0.034 | 0.00034 |
| 99.9995% | 4.4 | 5.9 | 5 | 0.05 | 0.0005 |
| 99.9992% | 4.3 | 5.8 | 8 | 0.08 | 0.0008 |
| 99.9990% | 4.2 | 5.7 | 10 | 0.1 | 0.001 |
| 99.9980% | 4.1 | 5.6 | 20 | 0.2 | 0.002 |
| 99.9970% | 4.0 | 5.5 | 30 | 0.3 | 0.003 |
| 99.9960% | 3.9 | 5.4 | 40 | 0.4 | 0.004 |
| 99.9930% | 3.8 | 5.3 | 70 | 0.7 | 0.007 |
| 99.9900% | 3.7 | 5.2 | 100 | 1.0 | 0.01 |
| 99.9850% | 3.6 | 5.1 | 150 | 1.5 | 0.015 |
| 99.9770% | 3.5 | 5.0 | 230 | 2.3 | 0.023 |
| 99.9670% | 3.4 | 4.9 | 330 | 3.3 | 0.033 |
| 99.9520% | 3.3 | 4.8 | 480 | 4.8 | 0.048 |
| 99.9320% | 3.2 | 4.7 | 680 | 6.8 | 0.068 |
| 99.9040% | 3.1 | 4.6 | 960 | 9.6 | 0.096 |
| 99.8650% | 3.0 | 4.5 | 1,350 | 13.5 | 0.135 |
| 99.8140% | 2.9 | 4.4 | 1,860 | 18.6 | 0.186 |
| 99.7450% | 2.8 | 4.3 | 2,550 | 25.5 | 0.255 |
| 99.6540% | 2.7 | 4.2 | 3,460 | 34.6 | 0.346 |
| 99.5340% | 2.6 | 4.1 | 4,660 | 46.6 | 0.466 |
| 99.3790% | 2.5 | 4.0 | 6,210 | 62.1 | 0.621 |
| 99.1810% | 2.4 | 3.9 | 8,190 | 81.9 | 0.819 |
| 98.930% | 2.3 | 3.8 | 10,700 | 107 | 1.07 |
| 98.610% | 2.2 | 3.7 | 13,900 | 139 | 1.39 |
| 98.220% | 2.1 | 3.6 | 17,800 | 178 | 1.78 |
| 97.730% | 2.0 | 3.5 | 22,700 | 227 | 2.27 |
| 97.130% | 1.9 | 3.4 | 28,700 | 287 | 2.87 |
| 96.410% | 1.8 | 3.3 | 35,900 | 359 | 3.59 |
| 95.540% | 1.7 | 3.2 | 44,600 | 446 | 4.46 |
| 94.520% | 1.6 | 3.1 | 54,800 | 548 | 5.48 |
| 93.320% | 1.5 | 3.0 | 66,800 | 668 | 6.68 |
| 91.920% | 1.4 | 2.9 | 80,800 | 808 | 8.08 |
| 90.320% | 1.3 | 2.8 | 96,800 | 968 | 9.68 |
| 88.50% | 1.2 | 2.7 | 115,000 | 1,150 | 11.5 |
| 86.50% | 1.1 | 2.6 | 135,000 | 1,350 | 13.5 |
| 84.20% | 1.0 | 2.5 | 158,000 | 1,580 | 15.8 |
| 81.60% | .9 | 2.4 | 184,000 | 1,840 | 18.4 |
| 78.80% | .8 | 2.3 | 212,000 | 2,120 | 21.2 |
| 75.80% | .7 | 2.2 | 242,000 | 2,420 | 24.2 |
| 72.60% | .6 | 2.1 | 274,000 | 2,740 | 27.4 |
| 69.20% | .5 | 2.0 | 308,000 | 3,080 | 30.8 |
| 65.60% | .4 | 1.9 | 344,000 | 3,440 | 34.4 |
| 61.80% | .3 | 1.8 | 382,000 | 3,820 | 38.2 |
| 58.00% | .2 | 1.7 | 420,000 | 4,200 | 42 |
| 54.00% | .1 | 1.6 | 460,000 | 4,600 | 46 |
| Note | Sigma level is typically reported as short-term sigma. When the shift between long-term and short-term capability can be determined, six sigma methodology requires the team to calculate and report short-term sigma based on the actual shift. For reference purposes, this abridged chart uses the generally accepted shift of 1.5 to approximate short-term sigma value when long-term sigma is known. |
|