Honestly, I don't believe anything about specific calories burnt in relation to any exercise, other than believing that it takes more calories to chew celery than celery contains.
There are just too many variables
and what the heck is a calorie anyway? (No, Lynne, resident scientist, I don't really need the definition of a calorie.

)
The best diet and exercise plan to start with is to put less bad stuff in and put more activity out.
Note, a slightly better defined diet plan and more measurable diet plan is recommended since my non measurable "less bad stuff" hasn't translated into much weight loss for me.
Margaret, no one here is going to tell you that stepping is going to lead to significant weight loss. Just like the cereal commercials that tell you the cereal is an "important part of a complete breakfast"...physical activity is an important part of a healthy lifestyle. Stepping is a
fantabulouso way to increase your physical activity and have fun at the same time.
It won't make pounds melt off of you.
It
can
* increase your self esteem as you see your numbers go up
* help shift your focus from the non healthy activities that might have been occupying your time
* and even lead you on to other activities that help shape your body or your mind.
Relax, have some fun, but don't look at that stupid calorie button.
Andrea