When you first join SparkPeople gives you a conservative caloric expenditure based on 30 minutes 3 times a week and configures your calorie burned goal based on this data. If you are expending a higher amount than that, you can manually change the figure by clicking on the link next to the calories burn goal in your My Goals and Progress section on your Start Page. Therefore your calorie range is determined by the number of calories you are expending and the other factors (current weight, goal weight, time frame to meet your goal weight, not to exceed more than 2 pounds weight loss per week).
As for ST, SparkPeople does not calculate calories burned for this activity, see link below. www.sparkpeople.com/community/ask_the_expe
I hope this helps!