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While calculating BMR (basal metabolic rate) and your calorie burn is a bit complicated, there are a few tools to help guesstimate.

Here's an easy calorie counter

and here's a straightforward explanation of how to calculate BMR and calorie burn.

USA Today published a chart of calories burned during exercise and typical daily activities. The chart shows that a 154lb person burns 70 calories watching TV, but 100 calories writing. It looks like the greater brain activity required for writing expends more energy than watching TV.