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I don't know where you guys are getting the idea that all engineering is done in metric. I was an electrical engineer so I didn't have much use for measurements but I worked with mechanical engineers on a daily basis. Nothing that they did was metric. They did use 10th, 100ths, 1000ths of an inch instead of 8ths, 16ths, 32nds, etc. As long as the stuff you're doing is not too big to express in inches, metric doesn't have any advantage. There is certainly nothing in buildings and such that is in metric. All the standard measurements for doors, windows, pipes, boards, etc are all in feet and inches.
For all practical purposes the only conversion you have to make in any kind of construction or machining or anything really is feet and inches, and any high school dropout capable of swinging a hammer will have multiplying or dividing by 12 down in a month.
For all practical purposes the only conversion you have to make in any kind of construction or machining or anything really is feet and inches, and any high school dropout capable of swinging a hammer will have multiplying or dividing by 12 down in a month.