How do Americans calculate energy?

Question

For instance: e = mc2
c, in inches
m, in pounds, then,
e, in BTU's?

Or is there people in America that knows the metric system ?

Answer 1

We are required to use the guidelines of Standard International units when publishing all our internationally refereed scientific papers.

m is mass in kilogram
c is the speed of light in meters per second
and the answer is in Joules, a unit of energy.

Answer 2

Schools in america teach metric in science classes.