[m463]

I juggle this kind of stuff in my head, teaspoons, tablespoons, cups, ounces, pints, quarts, gallons; 1/4 inch, 5/16 inch, 7/32nds, foot, yard, mile and...

I can see why some people like the metric system.

[Jugurtha]

One of the first things Thomas Keller says in his Masterclass course is to drop these, get a good quality measuring scale and use grams.

I suppose that as someone with two three-star restaurants, consistency matters.

[auxym]

Try mechanical/civil engineering in Canada.

Most projects are metric, or at least, I prefer working in metric when I can. However, things like raw materials (ie sheet steel and similar) are only sold in us customary units, or worse, gauge measurements. Cutting tools for machine tools (drills, mills, lathe inserts, etc) are also much more common in US units than metric

I'vr pretty memorized the millimeter equivalent of most fractional inches, up to sixteenths, by now. I've also worn the silkscreen off the 2, 5 and 4 buttons and finally broken the 5 switch on my previous calculator, bfrom the sheer number of multiplications and divisions by 25.4 I've done.