Celsius tried to fit too much into 100 notches to please big math.
F is more nuanced with more notches, but the ends aren't logical. It coukd be shifted perhaps, but how?
If freezing was moved to 0, then water boiling would be 180
Perhaps C could have had a 200 degree range, then it would be closer to F and not so hard to convert.
But also: Scientists are important and we shouldn't make it too easy, it demeans their work. Maybe make the C scale show water boiling at 183.4521 degrees so scientific calculations are more impressive-looking and respectable.
America moving zero to Celcius' zero would be better, it would remove one whole step from the calculation
Then if they made their degrees about 9 fifths the size (they could get higher resolution than they'd lose by doing what we do and quoting temperature to one decimal place where needed) it would be dead simple to convert (just change the symbol from °F to °C!)
K is just shifted °C though and just removes what's nice about it with freezing/boiling of watee while requiring 3 digit numbers for every temperature you'd encounter in daily life. I think I'd rather use Fahrenheit