The United States has been converting to the metric system for how many years? It still has not made with the exception of the science world. I still am amazed by the number of students who struggle with the metric system and converting from one to the other.
Make sure you understand the prefixes, and what they mean. Metrics are much easier to use, once you have the whole Kilo/centi/deci/milli issue mastered. When you get used to it, you will LOVE only having to move decimal points and zeroes around!
Yes, it is very confusing sometimes having to handle conversions from the Imperial system to the metric system. However, fortunately, in this age of internet wizardry there are many different tools and resources for you to use and to help you in your situation. Click on the link below to be taken to a number of different sites that you can browse through and then choose the one that you like the look of best.
There are some easy and great online conversion programs/websites that make it simple for you, and allow you to convert from any unit to any metric unit.
Here's one handy link:
One advantage that the metric system has over other systems is that it is uniform. If you know Greek prefixes, then you know how the system works and operates. The US is a historically traditional country so as long as the system that we have is still popular, there will be no reason to change it.