Maybe a reader can help me out.
One thing I've never fully understood is how the whole "burning calories" thing works when it comes to exercise. The rule of thumb that I learned (and which you can see here) is that, for every pound you weigh, you burn about 12 calories daily, so to maintain your exact weight, you need to consume [pounds x 12] calories per day. At 270 pounds, then, I need 3240 calories a day just to sustain my weight.* To put it another way: were I to sit around and do nothing all day—including not eating or drinking anything caloric—I'd burn 3240 calories.
My pedometer, when I walk, is measuring calories burned. Yesterday's walk, for example, supposedly burned 2546 calories (I'm really not sure how accurate this count is, but I think it's partly based on the weight I had entered for myself long ago). My question, then, is this: do I add 2546 calories to my BMR-based 3240 calories to get a one-day caloric burn of 5786 calories? Or do I somehow "overlap" the exercise-related burn with my BMR burn to arrive at a lesser figure? I've never understood the math on this.
*We now know this is wildly untrue, at least in my case. As I noted after having done my 14-day experiment, my body's basal metabolic rate is super-slow. I'm sure that I burn far less than 12 calories per pound per day. Were I to actually eat 3200-plus calories a day, I'd likely gain weight faster than Violet Beauregarde inflating into a giant blueberry.