Here's something you may not know, I visit the following website almost every single time I write a pattern. What could it be? Yarnstandards, yes, but not this time.
I go to Manuel's Web No, it's not scary, yes, your kids can view it, it won't get you in trouble at work.... it's a conversion site that helps me convert inches to cm! Exciting, huh? Maybe not, but very useful. Like I said, I have this site bookmarked and I refer to it every time I write a pattern when I am writing the sizing and gauge sections of my patterns.