At Google type 1L in cups; 2m in ft; 1c in ml; 60mph in whatever. This is a fast way to get a feel for all conversions.
Google rocks, it's faster than getting out the calculator--though I always feel like my high school math teacher would give me a hard time for not doing the conversions myself! :)
I did finally add a gram conversion column in my excel bread recipes, as it is a lot easier especially for yeast and salt weights.
See? We americans can learn metric...eventually!