There are economic problems that require Calculus, such as optimization problems, calculating rate of change, etc.
However, I'm not an Economics major (my major is Statistics) so I'm not exactly sure how math intensive an Economics degree will get.
I do know there are different levels/tracks of Economics degrees, some much more math intensive than others. A BS in Econometrics or Mathematical Economics will require upper level mathematics and statistics courses. A BA in General Economics given will probably require less math. It depends on your school. The higher you go in Economics, the more math intensive some of the class get.
I would not compare a high school level Economics class to a College Economics class - completely different animal. Get to college, take macro and micro economics, see if you like it and then decide if you want to pursue that path. Macro and Micro Economics are beneficial to take because they are often prerequisites for many college majors, so no harm no foul in taking them.