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One Gram of Carbohydrates Has How Many Calories?

author image Mandy Ross
Melissa Ross began writing professionally in 2009, with work appearing in various online publications. She has been an American Council on Exercise certified personal trainer since 2006. Ross holds a Bachelor of Science in kinesiology from California Polytechnic State University, San Luis Obispo and a Master of Science in kinesiology from California State University, Fullerton.
One Gram of Carbohydrates Has How Many Calories?
As assortment of dry pasta noodles. Photo Credit: AlexPro9500/iStock/Getty Images

Dietary macronutrients include carbohydrate, protein and fat. Each macronutrient provides a specific amount of calories per gram. Understanding the amount of calories in 1 g of carbohydrate allows you to make informed dietary choices.

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According to the book “Anatomy and Physiology” by Kenneth Saladin, carbohydrates are stored in blood, liver and muscle tissue and used for energy during physical activity. In addition, carbohydrate is the preferred energy source for red blood cells and the brain during rest.


Not all carbohydrates are created equal. Complex carbohydrates such as whole-grain bread provide more nutrients than simple carbohydrates such as white rice. Fiber from complex carbohydrates supports healthy digestive system function.

Calorie Content

One g of carbohydrate or protein contains 4 calories while 1 g of fat provides 9 calories. One large white bagel contains 70 g of carbohydrate while one cup of brown rice contains 45 g.

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