How many kcal in 1g?

There are approximately 7.7 kcal in 1 gram of fat, 4 kcal in 1 gram of protein, and 4 kcal in 1 gram of carbohydrates. The exact number of kilocalories (kcal) in 1 gram depends on the specific macronutrient being measured. For alcohol, there are about 7 kcal per gram.