Weight Loss Benefits of Ballroom Dancing:
Ballroom dancing is a reasonable way to improve weight and burn calories. In terms of energy expenditure, about 15 minutes of ballroom dancing burns about 50 calories. Over 12 months, this daily ballroom dancing routine uses up a total of 18,250 calories per year: the equivalent of 5.2 pounds of body weight. http://www.calorie-counter.net/how-to-lose-weight/ballroom-dancing-fitness.htm
Calories burned from ballroom dancing:
Calories burned from ballroom dancing can range from 207 to 378 calories per hour depending on whether you are doing a slow Fox Trot or Rumba or a fast Swing (306 calories/hr) or Disco (394 calories/hr), with a generic average being ~ 300 calories per hour for active dancers.