Spaghetti squash is one of the lowest-carb vegetables you can use as a pasta substitute. One cup of cooked spaghetti squash contains just 10 grams of total carbohydrates and 42 calories. With about 2 grams of fiber per cup, the net carb count drops to roughly 8 grams, making it a practical option for low-carb and keto eating plans.
How It Compares to Regular Pasta
The difference between spaghetti squash and traditional pasta is dramatic. One cup of cooked semolina spaghetti packs 38 grams of carbohydrates and 196 calories. That means spaghetti squash delivers about 74% fewer carbs and nearly 80% fewer calories per cup. Even accounting for the fact that you might eat a larger portion of spaghetti squash to feel satisfied, the carb savings are substantial.
Beyond carbs and calories, the texture is the main trade-off. When you scrape the flesh of a cooked spaghetti squash with a fork, it separates into thin, noodle-like strands. They’re softer and more delicate than al dente pasta, with a mild, slightly sweet flavor that works well under bold sauces like marinara, pesto, or meat sauce.
How It Compares to Other Squash
Not all winter squash is created equal when it comes to carbs. Butternut squash, for example, contains 21.5 grams of carbohydrates per cup and roughly double the calories of spaghetti squash. Acorn squash falls in a similar range. If you’re choosing a squash specifically to keep carbs low, spaghetti squash is the clear winner in the winter squash family.
Full Nutrition Breakdown Per Cup
One cup (155 grams) of cooked spaghetti squash provides:
- Calories: 42
- Total carbohydrates: 10 grams
- Fiber: 2.2 grams
- Net carbs: ~8 grams
- Protein: 1 gram
It also provides vitamin A and potassium, along with small amounts of other vitamins and minerals. It’s not a nutrient powerhouse on its own, but as a vehicle for protein-rich toppings and flavorful sauces, it pulls its weight without adding much to your carb total.
Does It Work on Keto?
Spaghetti squash fits most low-carb diets comfortably, though strict keto dieters need to be mindful of portion size. A standard ketogenic diet limits total carbs to 20 to 50 grams per day. At 10 grams of total carbs per cup, a single serving uses up a meaningful chunk of that budget but still leaves room for other foods throughout the day. If you’re on the stricter end, keeping your portion to about three-quarters of a cup gives you a satisfying base for a meal while staying well within your limits.
For more moderate low-carb plans that allow 50 to 100 grams of carbs daily, spaghetti squash is an easy fit with no need to measure carefully.
Blood Sugar Impact
Spaghetti squash has a low glycemic index, meaning it raises blood sugar more slowly than high-carb foods like white pasta or bread. Its glycemic load is rated as medium. In practical terms, the combination of modest carb content and fiber means it produces a gentler blood sugar response than most starchy sides. For people managing blood sugar levels, it’s a much better swap than regular pasta or even other winter squashes.
Cooking Methods and Carb Content
Whether you roast, boil, or microwave spaghetti squash, the basic nutritional profile stays consistent at about 42 calories and 10 grams of carbs per cup. The cooking method does affect texture and flavor, though. Roasting at 400°F tends to concentrate the flavor slightly and produces firmer strands that hold up better under heavy sauces. Boiling yields softer, more watery strands. Microwaving is the fastest option and produces results somewhere in between.
The main thing that changes the carb count of your final dish is what you add to it. A cup of spaghetti squash topped with olive oil, garlic, and grilled chicken stays very low-carb. Covering it in a store-bought sauce with added sugar can quietly add 8 to 12 grams of carbs per half-cup of sauce, so it’s worth checking labels if you’re counting carefully.