How much energy in 1 gram of sugar?

Answer 1

There are 3,000 calories in terms of chemistry.
Food is measured in Calories, which are actually kilocalories.
There are 3 Calories per gram of table sugar - enough energy to fuel a rocket!.

Answer 2

Carbohydrates and Proteins have 4 calories per gram. Sugar, which is a carbohydrate, has 4 calories per gram. So, 10 grams of sugar would have 40 calories.