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Line Diameter 

This table containing the real diameter of braided superlines is originally from Stroft but they no longer publish it, because it puts them back against their competition which are all operating with fantasy numbers diameter wise. Of course you will find slight differences between various products but because they're all working with the same material the differences in diameter are not big in the end. Naturally any coating of the line enlarges the diameter but will usually make for better handling. Loose braiding, which you should avoid anyway,  leads to an optically larger diameter but doesn't really increase the volume of the line when your calculating the capacity of a reel for instance.
In any case this table will give you a much better clue about the diameter of your dyneema than whatever's written on the package.

And here's another interesting table concerned with diameter of fishing line. This one relates the American way of stating the strength of a line in pounds to the diameter this line has. It's in the nature of the game, that these can only be rough guidelines, because the breaking strengths used here seem to originate from long ago. But when you buy a 20 lbs line in America it usually really has a diameter of about 0.46mm. But a lot of "20 Lbs" lines (except for IGFA classified ones, these must break at the indicated strength) break at much more than 9 Kg. If we buy a good line of 9Kg tensile strength it will have a diameter of about 0.35 mm. I "stole" these data from a big game site, recalculated the mm numbers, because they contained a few errors.