Six Sigma Conversion Table

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Jay Arthur
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  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%
691462
317300
2
30.85%
0.308538

30-40%

308537
45500
10.00%
0.100000
100000
3
6.68%
0.066807
20-30%
66807
2700
1.00
3.00%
0.030000
30000
1.00%
0.010000
15-20%
10000
4
0.62%
0.006210
10-15%
6210
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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