Calories burned in 30 minutes

I found this chart on the Harvard Health Publications website, so its gotta be somewhat reliable, right?

Anyway it lists the approximate calories burned doing a variety of activities (from water polo to planting trees) for three different weights. Obviously it isn't going to be exactly right but it can give you an idea.

http://www.health.harvard.edu/newsweek/Calories-burned-in-30-minutes-of-leisure-and-routine-activities.htm