Polar F11 Calories Burned

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I got a Polar F11 for Christmas and just out of curiosity, I wore it at work all day today. I have a sit down job. Well from 6 am to 4:30 pm I only burned 2237 calories. I intake 1200 calories or so a day plus I actually burn exercise calories daily. My question is, does this site automatically take off your basic calories burned into consideration or should I be logging these calories in the exercise area or do I just put in the actual exercise calories burned from exercising?