If you were to work equally hard for equally long, you would burn the same amount outside as on a treadmill.
Running outside have two advantages:
-it's less boring
- it usually offers more natural variation which tend to make outside a better workout.
OTOH outside can be too hot/cold/rainy/sunny/scarytraffic/dark etc etc, in which case a treadmill workout is better than no workout.
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In terms of preventing injury, running on a treadmill is better. Road running has a tendency to destroy a lot of peoples knees which causes them to never be able to run again. Running on a treadmill would be better for training if that is available to you.
"Using a treadmill is as good as running or jogging outside. The advantage to a treadmill is you can use in inclement weather. When it is cold, hot, or rainy you will still be able to get your running done."
The benefits of using a treadmill are the ability to increase the intensity of a workout by adjusting the settings on the treadmill, and to have a consistent platform for running and walking, whereas roads and paths outside may be uneven. It also allows an individual to track the distance and calories burned during a workout.
It is better for calorie burning purposes to walk outside. Your body does more work this way. But if you are just starting to exercise, a treadmill is certainly better than nothing! And if you put the treadmill on an incline, you will start to burn more calories because of the resistance. http://walking.about.com/od/treadmillworkouts/a/outdoorsortread.htm
Both methods are good. It all depends on what results you are looking for and maybe where you live. A treadmill can offer a consistent workout and a way to track your results. Walking outside in the fresh air can be invigorating. The workout would be variable depending on the trail or path you choose.
Running on a treadmill or running outside is about the same but there are some benefits the treadmill has - like not having to worry about bad weather and hard pavement.