Suppose I'm reading a newspaper article, and it mentions two ounces of cocaine. I have no idea how much that is. Like I know what two ounces is, but I have no idea how many doses of cocaine that is. Is it one dose or one hundred doses? Sometimes you need to know this to properly understand the article.
I want an easily googleable website that will do this for me. Actually, I want Google Calculator to do this, but I don't think they'd go for it.