The US public is not interested in converting from a system that has been in place since before they were born.  However, virtually every research laboratory uses equipment and measurements based on metric units, and papers published in peer-reviewed journals report things in metric units.

Our cars have both on the speedometers - but that's probably more of a consequence of being cheaper for car manufacturers to print a dual dial for cars going to US and/or Canada.

My vehicles and tools are a mix of units - cars and tools made in Asia or Europe verus those from US.  Every hardware store stock nuts and bolts of both types.

I'm a woodworker and a scientist, so I go back and forth all the time.  I use what's most convenient or 'fits' the purpose.

But, every house, all of our lumbers, etc. is in inches and feet, so metric often doesn't 'fit' - too much infra-structure already in place.  And the average person doesn't use metric; they use what they grew up with.





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