This is a thread I had a while back. There is a link in the second or third post that sends you to a site and scroll down and look at the chart.
Just for reference a BMX or single speed chain is 1/8" wide and a multispeed bike is 3/32" wide. This is for comparison.
I went with the #41 chain which is a little wider than the 415 and helped straighten up my chain line being off.