I don't have any fancy gadgets or money to buy any right now, so how do I know how many calories I am burning during a work out session?
On a lazy day, I'll do the 2 Miles WATP's video, but most of the time I do High impact step aerobics for about 40 to 50 minutes, plus some stretching, sit-ups and leg lifts, and about 2 day's a week, I use 2 and 5 lbs weights with my aerobics.
Another website you can use to calculate calories burned is http://www.healthstatus.com/cbc.html. But keep in mind that all of these websites are just providing a very rough estimate at best. None of them can really tell how hard you are working. So I do not increase the calories I am eating based on the number of calories they say I've burned.
A better way of estimating how many calories you've burned would be to buy a heart rate monitor that includes this function.