How many calories are there per gram of fat?

One gram of fat contains 9 calories. There are 4 calories per gram of carbohydrates and 4 calories per gram of protein. Fat, carbohydrates, and protein are called macro nutrients.

The FDA requires "Calories from Fat" be listed in the nutrition label of food items in the United States. The amount can be found underneath or next to the total calories on the label. Other information required on nutritional labels include grams of protein, grams of carbohydrates, sodium, cholesterol, serving size, and servings per container. Trans fat is also listed on nutrition labels. The FDA started to require listing the amount of trans fat on nutrition labels in 2006.