When I was in elementary school back in the dark ages of the 1960's there was a push to change the U.S. to metric, they even taught us about it in school, but 'merica. Consequently I understand the ease of using metric vs. the pain in the ass of the imperial system but my mind is trained to do everything in imperial. There was a time in my construction years when I knew by rote the decimal equivalents of eighths of an inch, 1/8 inch is .125, 3/8 is .375, etc.