Estimate?

it's hard to estimate something like that, because how hard you work directly affects how many calories you burn. you can limp through it, or you can nearly make yourself sick by working too hard. personally, I use a heart rate monitor with a chest strap, and I've burned anywhere between 600-900 calories on any given day.

The amount of calories you burn doing anything involves many factors including how much lean body mass you have (muscle vs. stored fat). Two people who weigh the same doing one hour on the treadmill at the same rate can differ in calories burn by a few hundred depending on lean body mass. Stored fat just sits there waiting to be called on for energy. Muscle requires constant fuel even when it isn't doing anything. The more fit you are the more calories you burn working out.

312.

Age, weight, gender and other factors affect your calorie burn. Get a heart rate monitor that calculates calories if you can. That will help a lot. You will enter your body parameters into the device and it will give a you calorie information. You wear it like a watch. I know that you are in still in school and money may be tight.

yeah, so don't get a strapless one. the chest strap may be a pain, but none of the strapless ones can provide you with continuous realtime readings, or estimate how many calories you burned.