Why don't they just use the international measurement units?

Because the cost of transitioning would be astronomical. So many things would have to be changed to do it. If that reason frustrates the rest of the world, they can fund the quadrillions of dollars needed to aid the transition. From all cars, speeding signs, textbooks, teaching resources, educational platforms, temperature sensors, technical equipment, manuals, etc etc... Not to mention all the years required to educate people on how to use it instead of what they were used to. I know both systems because I'm an engineer, as well as the conversion equations for going back and forth. Is our system confusing, complicated, and illogical? Yes, of course it is. SI units are much easier because it's a matter of decimal places rather than another unit of measurement... however, it was what was used, and the cost has never been justified to change it. So, stay frustrated. Because it's a change that won't be happening any time soon.

I am used to inches and pounds and ounces because I grew up with all that but when I am here I use the metre and centimetre and kilos and all that. Its true that at the start I got mixed up as to what a kilo was and one of my friends only wanted a quarter of a pound of ham and she ended up with a kilo of it instead..

they tried years ago to push the metric system and it failed miserably. part of the reason probably is they'd have to change street signs nationwide and that would run into the millions.

I also dislike the use of Farenheit. They should upgrade on this point, it is starting to become a handicap.

Here too in the Philippines, we use by the yard but also by the meter. But as to our weight, we also use kilograms but I am used to seeing my weight in pounds. But we read our temperature by Celcius. I think we are now trying to adopt other countries' way of measuring things.

I am an American and I would not want to ever change. If it is done, do it when I am gone.

They are a very strong country, and very proud, they're unlikely to listen to our needs. Unless we boycott them and don't allow them to trade with us anymore. Oh wait, that's what Trump is risking by implementing the import tariffs! I wouldn't be talking to Americans if I didn't have the internet, and thanks to the internet, it takes me seconds to convert stuff so I'm not too concerned. Well, as we must learn English because it's the the most widely accepted language, they could also learn Metric because it's the the most widely accepted measurement system.

I have been taught the Indian system of measurements in school and I have strong grip on it. My point is what we have learned in childhood is what we are comfortable with.

I know right it would be easier

Yes I agree with you, I sometimes get confused when they use Fahrenheit instead of Celcius..