I saw the FAQ on this website and was still not successful in getting to work (graphic attached)
I am trying to use these two functions to convert things like: nautical miles to kilograms,radians to degrees or even pounds to kilograms. Any and all help is greatly appreciated!
By the way I am using Mathematica 11.2
This works for me. Try quitting your Kernel -- you must have something defined that is interfering.
In:= UnitConvert[Quantity[6.2, "NauticalMiles"], "Kilometers"]
Out= Quantity[11.4824, "Kilometers"]
In your second example, you can't type "8.2 lb" -- you must use Quantity. MMA interprets 8.2 lb as "the number 8.2 multiplied by the variable lb" -- it is not a unit.