Because 1 tablespoon of sugar provides 12 grams of sugar, the yogurt contains about 2.6 tablespoons, or just over 125 calories, worth of added sugar.nowing how many calories and grams of refined sugar are in a specific unit of measurement, whether it’s a teaspoon or a tablespoon, generally allows you to calculate the number of calories in foods with added sugar. Sugars, starches and fiber are each a form of carbohydrate.