There are roughly 7 grams of carbohydrates and 1.5 grams of dietary fiber in 1 cup of spaghetti squash. A 4-pound spaghetti squash will yield about 5 cups of spaghetti squash. So, you are looking at around 35 grams of carbohydrates and 27 net carbs per spaghetti squash. This recipe is a much healthier option than classic pad Thai.