Carbs in Heavy Cream & Is Dairy & Saturated Fat Bad For You? One cup of heavy cream = 6g of carbohydrate. In other words: in 120 calories of heavy cream there are 7 grams of saturated fat, 12 grams of total fat, and slightly less than 2 grams of carbohydrates. There is slightly less than 1g of carbohydrate in one serving of heavy cream. Pin this: Keto Gift Basket Read Next Post →