Spaghetti squash carbs are minimal especially when compared to pasta.   The net carbs in one cup of spaghetti squash is 8 net carbs. Total Carbohydrates: Approximately 10 grams Dietary Fiber: Roughly 2 grams Net Carbs: Total Carbohydrates minus Dietary Fiber Net Carbs: 10 grams – 2 grams = 8 grams If you are on a low carb diet, spaghetti squash is a great choice.