Check out this activity calculator on web md.
http://my.webmd.com/hw/weight_contro...ealthTools.asp
According to it, bowling is a form of exercise. I've checked out alot of these calculators but this is the one I tend to trust the most. I also use fitday but the calculator in it uses an average weight for a person of 150 pounds. When you weigh more, you burn more since it takes more energy to move more weight. I like this one much better since it takes your weight into account. Hope that link works! When you get to the page, click on the "activity calorie calculator".