How many calories are in a gram of fat? by Dr. Lonna Denny | Mar 14, 2017 | Health & Exercise Tips, Newsletter, Nutrition, Trivia | 0 comments There are 9 calories in one gram of fat. In contrast, one gram of carbohydrate or one gram of protein each contains just 4 calories. Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.