According to Diet & Fitness Today, the average male burns 155 calories in one hour simply by sitting at his desk and typing. The average female burns 133 calories per hour.
A person’s calorie burn is based on weight, whether he is sedentary or not, and the intensity of any activity. Those who increase their activity levels while typing will experience a higher calorie burn than those who simply sit and type. For example, Lifehacker.com presents the case of a blogger who claims to burn 600 calories every morning by working from a treadmill and walking at a speed of one mile per hour as he types.