Calculate the grams of protein, carbohydrates and fat in a meal that is 850 calories and is 25% protein, 45% carbohydrate and 30% fat

The majority of your calories, 45 to 65 percent, should come from carbs, which have 4 calories per gram. Following a 2,000-calorie diet means that you need 225 to 325 grams of carbohydrates each day.