Only speaking for myself, as an engineer on one hand and an anglophile on the other, I know the approximate metric sizes of some basic units like inches, yards, miles or gallons, but with degrees Fahrenheit, I’m already lost, since you need to multiply and add/subtract to convert, so it’s not intuitive and I don’t know the formula by heart.
I can’t be bothered to learn just how much fluid ounce is; it strikes me as a rather unwieldy increment of measure.
In the dog section of Yahoo Answers measurments of dogs and their food comes up. It is highly international. I guess the dog food companies use the same packages in other countries. ‘‘How many grams in a cup of food?’’ Due to the nature of my dog care, I have found it expedient to convert pounds of dog food to cups. I figure the Pro Plan I once measured is similar to other dry foods, about 4.5 cups per pound. I have done enough scientific work to be at ease with the metric system, unlike many Americans. I don’t suffer math anxiety either.
In the 90’s when my son was studying architechture in Malta, much of the measurments were still in customary. Some of it was using the uncalibrated template the architect made.
American here. I live in Prague and of course we brought measuring cups from the US to use here. I am still baffled by flour, sugar etc being in grams. You can’t even buy real vanilla here so we brought some of that from America too (which we measure in teaspoons).
Everything else I am used to - kilometers, Celsius , no problems, but cooking… get my my cups. 
Are you sure it is universal? I was reading an Australian car review and they were talking about the mileage in imperial gallons. Come to think of it what do you call mileage in metric?
I’ve never seen petrol or anything else measured in gallons. Maybe they had their information from a US source?
Mileage is still called mileage, it’s just that the units are kilometers. 
. Or “fuel economy”. Generally X litres per 100km (which of course is also upside down from mpg - no idea why we do it that way)
I don’t get the stone thing Brits use soemtimes for weight. Is their some American equivalent? Do Brits just do some conversion thing in their heads to get the weight in kilos?
We don’t use kilos to weigh ourselves.
14lbs is 1st. It’s the next unit up.
Like ounces and pounds, right? Exactly the same. If stone is weird, then so are ounces.
I’m about 11 stone.
Yeah, Canada seems quite firmly stuck using both systems of measurement. Officially we’re metric, but we swing back and forth at will. Typical Canadian sentence - “It’s -25 degrees out (the Celsius is understood), so I’ll use my car to drive the couple of kilometers to the store to pick up a couple of pounds of hamburger. Hey, did you see my 25 foot extension cord to plug the car in?”
Yup. I have no idea my height in centimeters or my weight in kilograms, but I use kilometers and celsius all the time.
I was talking about foods, not drinks. Drinks are metric except beer, of course, and milk, sold in pints but with the metric amount written on the side too.
Formally, I see metric and imperial happily co-existing with metric gradually taking over (I hardly ever use recipes, so I take your and San Vito’s word for it that they’ve completely changed to metric - I thought they still wrote both), but informally I hear people refer to things like a pound of potatoes, not a kilo. Perhaps there’s a class difference; you are from a much posher background than me.
(Please let this not be yet another thread where everyone gathers round to tell me that my experience of England is wrong, wrong, wrong. Especially ex-pats and foreigners who don’t actually live here).
I wouldn’t be too certain about the weather, actually, partly because I wouldn’t be sure which system you were using. Two hundred pounds I know is overweight, but to really comprehend how overweight I have to convert it to stones - though I’m getting more accustomed to pounds over the years. The rest is the same here.
I know that translates roughly to 1.80m and 90kg, but I don’t count, since I lived in the US for 5 years; plus, I know that those numbers can mean someone who’s fat or someone who’s large (in the meaning this word had before it started meaning “fat”). My brothers would probably be able to translate the height pretty fast thanks to RPGs, but would need to google the weight. Inches, both Middlebro and I are engineers, so we know that the Imperial inch is 2.54 cm; we can convert if needed but it’s not automatic.
As for the weather, I know how to convert from F to ºC (had to do it enough times - and heck, I can even translate into Reaumur), but it’s not and will never be automatic. I only work with the two centigrade scales 
And 13lb babies, uh, that’s about 6.5kg actually less take 10% off so 6kg uh… where’s the calculator… it seems to be pretty big, but to know whether it really is big or the rough conversion is totally off, I need the calculator.
I must of messed up. I was looking at reviews of the Fiesta Econetic and must have mixed up an English review for an Australian review. I checked the reviews and all the Australian reviews said liters per 100km and the English reviews said mpg.
The centigrade/Celsius system is not really more ”metric’ than Fahrenheit.
Every system of units which uses metric units for length and mass also uses Celsius (or Kelvin, but that’s a direct derivation from Celsius) for temperature.
Celsius might not be SI but it is metric.
I doubt it. French people on the overall wouldn’t have a clue what an inch, foot, pound, mile is Why would they? They never deal with those measurements. I have a (rough) idea, but it’s essentially a result of having spent a lot of time on american internet sites, something the average French has no reason to do, either. And even then, I had to do the maths in my head when reading your post to figure out whether the guy was thin or not. It isn’t intuitively meaningful for me
Also : regarding the OP mention of exposure to American medias, it’s not really relevant. The main medias people are exposed to are songs and movies. Measurements don’t appear much in the former and it’s always translated into metric units in the latter.
That would be a weird manifestation of class difference, but maybe you’re right.
Absolutely my experience too. And dividing by 14 in your head is a nightmare.