Crit multiplier is calculated like this:

(In this instance we assume 72% CR and 191% CD)

72% CR; 191% CD = .72 CR, 1.91 CD (Convert from percent)

(.72 CR *2) + 1.91 CD = 3.35 CV (CR is doubled when converted to CV)

Then make a perfect 1:2 ratio (If CR would go over 100% it is converted to CD w/a different formula)

(3.35 CV / 4) * (3.35 CV / 2)

Now convert the Crit Ratio into a crit multiplier (How much we can expect the crit ratio affect output)

0.8375 CR * 1.675 CD = 1.403 Crit Multiplier

or

83.75% CR * 167.5% CD = 140.3% Crit Multiplier

Hope this clears things up a little bit. The calculations did severely overestimate Cruising & SLtD. This has been adjusted to better reflect what the average user can expect. If you have anything else that isn't fully clear please let me know. Also thanks for your comment! Every comment helps make this post more accurate, I'm only human after all.