Researchers measured the caloric expenditure of four groups doing four different activities: typing while sitting, watching TV while sitting, standing, and walking. In 15 minutes it turns out that standing burns 2 more calories than sitting. From this article How Many Calories We Burn When We Sit, Stand or Walk, some quotes:
“Someone who stood up while working instead of sitting would burn about 8 or 9 extra calories per hour. (Just for comparison, a single cup of coffee with cream and sugar contains around 50 calories.)”
“When the volunteers walked for 15 minutes, even at a fairly easy pace, they burned about three times as many calories as when they sat or stood. If they walked for an hour, the researchers calculated, they would incinerate about 130 more calories than if they stayed in their chairs or stood up at their desks.”
You’ve got options for creating a caloric deficit. You could stand at work for most of the day and earn cream and sugar in your coffee, or you could sit at work and drink your coffee black.