The Carbohydrate Counter (see the headings just to the right of your post) gives these values for 8 ounces of half-and-half cream

Total Carbohydrates 10.41 g
Dietary Fiber 0.00 g
Total Protein 7.16 g
Total Calories 315.48
Total Fat 27.83 g


So in 12 ounces of half-and-half, there are 15.6 grams of carbs & about 468 calories.