Six Sigma Conversion Table
Many people ask how percents and fractions convert to parts per million (PPM). Here's a cheatsheet!
| Sigma | Percent | Fraction | Lost Profit (% of Sales) |
Motorola's 1.5 Sigma Shifted PPM |
Unshifted PPM |
Cp |
1 |
69.15% | 0.691462 | 50% | 691,462 | 317,300 | |
| 2 | 30.85% | 0.308538 | 30-40% | 308,537 | 45,500 | |
| 10.00% | 0.100000 | 100,000 | ||||
| 3 | 6.68% | 0.066807 | 20-30% | 66,807 | 2,700 | 1.00 |
| 3.00% | 0.030000 | 30,000 | ||||
| 1.00% | 0.010000 | 15-20% | 10,000 | |||
| 4 | 0.62% | 0.006210 | 10-15% | 6,210 | 63 | 1.33 |
| 5 | 0.02% | 0.000233 | 5-10% | 233 | 0.57 | 1.67 |
| 6 | 0.0003% | 0.000003 | <5% | 3.4 | .002 | 2.0 |
1.5 Sigma shift accounts for "typical" shifts and drifts of the mean.
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