I've been doing a bit of research on this one, due to slight weight increase from Christmas overeating.
It depends on your size to start with, but about 6 calories per minute burned up for fast ballroom, which I would think comparable to leroc.
Bearing that in mind, I reckon the following:
Beginner Class - about 100, depending on how much talking instead of actual dancing done.
Intermediate Class - probably about the same, or may more, 120, as pace tends to be quicker
Class Freestyle - Keep going for half an hour and 180 calories gone.
Proper Dance - If you are like me and just keep on dancing, with only a few breaks, a massive 720 calories.
