The metric system seems to scare many people in the U.S. There are now many websites that have on-line metric converters which makes life much easier. Try using this metric conversion calculator. Or search on any of the search engines for "metric conversions."
I have also found the online convertors at http://www.onlineconversion.com/ to be good.
Also, if you don't mind downloading a small program, there is also "Convert":
I have been using Convert for several years and never had a problem with it or a conversion it could not do. It is small, doesn't need an install program, just sits there on my desktop for when I need it, I just close it down when I am finished. Clean and slick.