Nutrients are present in all the fruits but in different quantities. Hence, it is essential to be aware of the nutritional value of fruits before we add them to our health routine. Grape vs Guava Nutrition will help you choose the best fruit among the two. Carbs in Grape and Guava are 18.10 g and 14.30 g respectively. The protein content of Grape and Guava is 0.72 g and 2.50 g. Protein to carb ratio of any fruit must be approximately 1.34. Protein to carb ratio of Grape is 0.04 and in Guava, it is 0.18. Nutritional value of fruits is incomparable to other food items. They provide all the vital nutrients required for proper functioning of our body.