knitting gauge math factoid

[kismet09]

So I just learned, although it isn't confirmed by anything, the following: "if you take the gauge of one strand of yarn and double it, then divide by three, that would give you the gauge if you doubled it. So for example - if you're working with Plymouth Encore at a gauge of 4.5 sts per inch, and decide to double it, the resulting gauge would be 3 sts per inch or (4.5 X 2)/3."

I will have to test that formula! It'd definitely be a good rule of thumb to know.