I'm an American, so I shouldn't really be answering, but I'll answer anyway.  I'm really defiant that way.

I've read enough European journals that I've gotten pretty good at converting metric miles, weights and temperatures to American standards.  I kind of like the differentness.  Also, I watch a fair amount of golf on TV.  I find it curious that every player from every country all over the world measures the distance from tee to green in terms of "yards."

I truly believe there's a Simpsons episode for every single issue in life. I always wondered why the US never adopted the metric system. Now I know... it's a tool of the devil!

You are indeed the devil's people...
It puzzles me that humble Indians working in paddyfields can happily convert to the metric system while Americans, who once got a man to the moon, are too feeble to grasp it.
And now, for the more educated, cerebral and international of our following, a French way to remember the relationship between a mile and a kilometre...
Un ciseau neuf

(A new pair of scissors)

Or 1.609.

Being the length of a mile in kilometres.
Don't worry if you don't understand. It's probably because you're American!

Oh, I think you're all talking about me! I grew up in the USA, spent my first 21 years there, then moved to the Antipodes... everything is upside down here. 

It took me about 5 years to convert to proper English spelling; becoming a high school teacher cemented that in place. Comprehending kilometres was a quick and painless transition, it only took a few months. Unlike Ian, I have never ridden the magic imperial century on a loaded bike. I think that one is well past me now. But after 50 years, I still struggle with converting measurements under 1 metre to imperial and visa versa. Temperatures are easy: 100F is hot! 37C is just as hot! 

In two instances here a lot of people still revert back to imperial measurements. Weight of new born babies and trout are often expressed in pounds and ounces.

And after 50 years, I still can't shake this accent...

Hi Victa
Never worry about your accent. It's what makes you interesting and different from everyone else. I speak from experience.

You may grow tired of people asking where you come from (and when you're going back) but, without the accent, they'd never ask at all, would they?

Good one!!!!😀

I was in about grade 1 or 2 when Canada converted to metric so I learned both. However, we were taught to estimate and learnt that a cm was about the width of a fingernail, mm the thickness of a dime, 16C one may need a sweater.and 500ml was close enough to two cups Hence, I don’t often do a  mathematical conversion in my head. I just estimate. As Steve said  weight of people is still for some reason usually in lbs. when we lived in the UK they did in stone ( 14 lbs!!!) that one threw me  for a loop. 
We still bake using cups and our butter comes in pound bricks although is marked 454g . ( a relic from the butter board way back when) This throws many a European for a loop as they bake thinking the butter would be 500g but no…. 

I just checked in the fridge Kirsten and Aussie butter definitely comes in 500g bricks. 

Another idiosyncracy, in gold mining the metric system is used for everything except for the finished product which is measured in ounces instead of kilograms.

The troy ounce is a bit lighter than your ounce used for cooking etc.

Crude oil is still measured in barrels world wide, no idea how many litres/gallons that represents.

Also I have an idea that US gallons are not the same as Imperial gallons.

Pounds are actually a unit of force. Mass is officially measured in slugs in the US Standard system but nobody uses that except in physics questions, as far as I know.   I’m a Canadian who learned the imperial system as a child and the metric system in high school and university and later worked in both as a structural engineer.