Obviously you are burning an amount of calories based on your basal metabolic rate, although this would happen regardless of whether you were standing, sitting or sleeping.
However, standing up also puts pressure on the spinal erector muscles, the rectus and transversus abdominus muscles (which work together with the spinal muscles to hold the torso upright), the leg muscles, and also the neck muscles which have to support the weight of the head.
As standing is a static activity, these muscles merely provide support rather than repeatedly contracting and relaxing as would be the case with running or walking, so their energy needs are greatly reduced. That said, standing up for a prolonged period of time would still burn calories which wouldn't be burned if you were lying down.
Its impossible to give an exact figure, though I would estimate it could be anywhere from 50-100 calories per hour depending on the height/weight of the person.
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'150 calories.....easily'...I think he means per hour. Merely standing through an 8 hour shift would burn ~800 calories (100/hr). Physical labor beyond just standing still would increase that number depending on the intensity and kind of work.
anywhere from about 600 calories to about a 1000 calories. It depends on your weight, obviously the heavier you are the more calories you will burn.
however, dont consider it a work out, that is about the same amount of calories you would burn just sitting on the couch. The calories being "burnt" reflect, for the most part, the standard amount of energy you body requires just to keep your lights on and organs operating.
You burn 1/2 a calorie by standing up. I thought of something cool btw, if you wanna burn those calories, stand up 100 times in a row BURNING 50 CALORIES! OMG!!!