I get this question quite often. Everything we do burns calories. That said, the rate of caloric burn is going to be different in everyone. The rate at which you burn calories will depend on your metabolism, your age, your weight and your current level of fitness. That all said, we don’t need to be incredibly scientific about it. As long as we are in the ball park, I consider that pretty good. I am going to use myself as an example here and use a few different common exercises so you can see the difference.
We are going to use 60 minutes of a certain activity at a moderate effort
Rowing, Stationary: Moderate: 566 Calories burned
Cycling, Stationary: Moderate: 566 Calories burned
Weight Lifting: Moderate: 242 Calories burned
Running: 11.5 Minute Mile: 727 Calories burned
Running: 10 Minute Mile: 808 Calories burned
Running: 9 Minute Mile: 889 Calories burned
Running: 8 Minute Mile: 1010 Calories burned
Running: 7 Minute Mile: 1172 Calories burned
Cross Country Skiing: 647 Calories burned
Walking: 15 Minute Mile: 364 Calories burned
So as you can see just using my data, there is a huge difference in the amount of calories I would burn by doing each of these activities for 60 minutes. It comes down to time spent doing the activity and the intensity that you put into it. The higher the intensity, the more calories you will burn. Are these numbers exact? Of course not, they are at best estimates but they are probably pretty close. In the end, it really only matters that you are going out there and doing something. The rest will take care of itself.