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According to the 2010 Dietary Guidelines for Americans, carbohydrates should make up 45 to 65 percent of a person's total daily calorie intake. Any amount less than this could be considered low carb. For someone consuming 2,000 calories a day, this is about 225 to 325 grams of carbohydrates per day. Most low-carb diets limit carbohydrate intake to between 50 to 150 grams per day, depending on the diet.
In 2007, the American Journal of Clinical Nutrition suggested that a low-carb diet consists of 50 to 150 grams daily. However, many research studies use diets with less than 100 grams of carbs daily to determine the benefits of low-carb diets, and some very-low-carb diets contain as little as 20 grams of carbs daily.