Board Thread:Wiki Discussions/@comment-24856060-20140423202209/@comment-1207741-20140423204213

Heights are not given in feet and inches, but only one at a time. What you are getting confused about is the decimal point. So when it says Kakashi is 5.938 ft, it is not saying he's 5'9". Rather, he is $$5' + (.938 * 12) = 5'11$$.

Your confusion is understandable since that's not how heights are expressed ordinarily, but I don't think anything can be done about it.