Are Mushrooms Carbs? | Carb Count, Fiber Per Serving

Are Mushrooms Carbs? Quick Answer For Everyday Eating

On paper, mushrooms do contain carbohydrates, but only in small amounts. Most common varieties are mostly water, with modest protein, a little fiber, and just a few grams of carbs per serving. That makes them far closer to non-starchy vegetables than to bread, pasta, or potatoes.

Lab data for raw white button mushrooms show around 3–3.5 grams of total carbohydrate per 100 grams, plus about 1 gram of fiber, which works out to roughly 2–2.5 grams of net carbs.^* A cup of raw sliced mushrooms (around 70 grams) sits near 2–3 grams of carbs. So if you have ever typed “are mushrooms carbs?” into a search box, the short, practical answer is that mushrooms are low-carb vegetables that happen to contain a little carbohydrate, not carbohydrate-dense foods.

For most people, that means mushrooms can fit easily into low carb, calorie-conscious, or blood-sugar-aware eating patterns, as long as the sauces, noodles, rice, or bread that go with them stay in check.

Mushroom Carb Numbers At A Glance

To see how mushroom carbs stack up, it helps to look at a simple 100-gram benchmark. The figures below round together data from nutrient databases and give a clear picture of how different mushroom types compare. Net carbs here are total carbs minus fiber.

Mushroom Type (Raw)	Total Carbs (per 100 g)	Approx Net Carbs (per 100 g)
White Button	≈ 3.3 g	≈ 2.3 g
Cremini (Baby Bella)	≈ 4.3 g	≈ 3.7 g
Portobello	≈ 4.4 g	≈ 2.2 g
Shiitake	≈ 6.8 g	≈ 4.3 g
Oyster	≈ 6.1 g	≈ 3.8 g
Enoki	≈ 7.8 g	≈ 5.1 g
Beech	≈ 6.8 g	≈ 3.7 g

As you can see, even the higher-carb mushroom varieties still sit in single-digit territory per 100 grams. That is very low compared with starchy foods, where the same weight can easily climb past 20–30 grams of carbs.

Carbs In Mushrooms For Low Carb Diets

Low carb and keto eaters care most about net carbs, since fiber does not raise blood sugar in the same way as digestible starch and sugar. Mushrooms line up well here. A typical serving adds just a few grams of net carbs, plus fiber and minerals that help round out plate nutrition.

An analysis that added about 84 grams of raw mushrooms to standard 2,000-calorie meal patterns found that total calories rose by less than 1%, and macronutrients, including carbs, shifted by only a few percent. At the same time, fiber and several vitamins and minerals climbed in a clear, measurable way.^* In practice, that means you can pile a generous spoonful of mushrooms onto a plate without pushing carb totals far from your target.

If you want to see raw data for specific mushroom types, you can look them up in
USDA FoodData Central, which lists detailed nutrient breakdowns for many varieties. The
Harvard Nutrition Source on mushrooms also describes mushrooms as low-calorie foods with modest carbs and useful fiber, which lines up with this picture.

For most low carb plans, a half cup to one cup of mushrooms fits comfortably within daily carb budgets, especially when you use them to stretch or replace higher-carb sides like pasta or rice.

How Mushroom Carbs Compare With Other Vegetables

Carb-counting guides from diabetes organizations group mushrooms with non-starchy vegetables such as peppers, broccoli, cabbage, and leafy greens. A standard serving of non-starchy vegetables, often defined as 1 cup raw or 1/2 cup cooked, tends to land around 5 grams of carbohydrate or less. Mushrooms sit in that same range.

In contrast, starchy vegetables such as potatoes, corn, and peas carry about 15 grams of carbs per comparable serving. So mushrooms give you volume, flavor, and texture closer to a vegetable side, without the same carb load that comes with a baked potato or a cup of rice.

That is why meal plans for blood sugar management often encourage people to fill more of the plate with non-starchy vegetables, including mushrooms, and use starchy foods in smaller, measured portions.

Serving Sizes, Net Carbs, And Real Plate Portions

It is one thing to look at 100-gram charts, and another to match those numbers to what actually lands on a plate. The table below shows common mushroom portions and their rough carb and net carb counts. These are estimates, but they track closely with data from large nutrition databases.

Serving Of Mushrooms	Total Carbs (Approx)	Approx Net Carbs
1 cup raw sliced white mushrooms (~70 g)	≈ 2–3 g	≈ 1–2 g
1/2 cup cooked sliced mushrooms	≈ 3–4 g	≈ 2–3 g
3 large grilled portobello caps	≈ 8–10 g	≈ 4–6 g
1 cup mixed mushroom stir-fry (mostly mushrooms)	≈ 4–6 g	≈ 3–5 g
1 cup mushroom soup base (broth and mushrooms only)	≈ 3–5 g	≈ 2–4 g
1/2 cup sautéed shiitake mushrooms	≈ 6–8 g	≈ 4–6 g
1 cup roasted oyster or enoki mushrooms	≈ 5–7 g	≈ 3–5 g

Even hearty portions rarely cross 10 grams of net carbs unless the dish includes noodles, rice, gravy thickened with flour, or bread. That is why many people who track carbs lean on mushrooms as a way to add bite and richness while keeping totals steady.

Protein, Fiber, And Other Nutrients In Mushrooms

Carbs are only part of the story. A cup of raw mushrooms usually provides around 2–3 grams of protein, plus some fiber and a mix of B vitamins, potassium, and trace minerals. That is not enough protein to anchor a meal by itself, yet it adds to the total when you pair mushrooms with eggs, beans, tofu, or meat.

Many varieties contain beta-glucans, a type of soluble fiber that may help with cholesterol and blood sugar control when eaten as part of an overall balanced pattern. The calorie count stays low: around 15–30 calories per cup for most common types. So you get flavor, texture, and micronutrients at a modest calorie and carb cost.

Some mushrooms also contribute a little vitamin D when exposed to light, along with copper and selenium. Those extra nutrients do not change the carb count, but they add more reasons to keep mushrooms in regular rotation.

How To Use Mushrooms When You Track Carbs

Everyday Cooking Tips For Carb Counters

When you build meals around carb goals, mushrooms can stand in for higher-carb ingredients or help bulk them out. A few simple ideas:

• Swap half the ground meat in tacos, meat sauce, or burgers for finely chopped mushrooms to cut carbs per bite and add moisture.
• Top a steak, chicken breast, or tofu with a pan of sautéed mushrooms and onions instead of a flour-thickened gravy.
• Use roasted mushrooms as a side in place of garlic bread, mashed potatoes, or extra rice.
• Stir mushrooms into omelets, frittatas, or egg muffins for more volume without a big carb bump.

These swaps keep the dish satisfying while turning down the total carbohydrate load of the meal. They also add umami, the savory taste that makes food feel rich and complete.

Mushrooms For Keto And Diabetes Meal Planning

On ketogenic diets, daily net carbs are usually held very low. Mushrooms are handy here because a half-cup or cup portion only uses a small slice of that allowance. Many keto meal plans feature mushroom sautés, stuffed portobello caps, or creamy mushroom sauces thickened with cheese and cream instead of flour.

For people living with diabetes, carb counting often follows a different pattern. Meal plans may use “carb choices” or set gram targets for each meal and snack. Non-starchy vegetables, including mushrooms, often count as a low-impact group: a serving usually provides 5 grams of carbs or less, some fiber, and very few calories. Mushrooms fit that profile well, which is why they appear often in diabetes-friendly recipes and teaching materials.

If you adjust your eating pattern for blood sugar, the carbs in mushrooms rarely cause trouble on their own. The bigger swing usually comes from what sits under or beside them: rice, pasta, bread, and sweet sauces. A registered dietitian or health care professional can help you set carb targets and decide how mushroom dishes fit into those numbers.

When Mushroom Dishes Become Higher Carb

Mushroom Sauces, Breading, And Fillings

Plain mushrooms stay low in carbs, but the dish can change once you add thickeners, breading, or sugary glazes. A few common places where carbs climb fast:

• Creamy mushroom soups thickened with flour, cornstarch, or roux.
• Breaded and fried mushroom bites, which pick up carbs from crumbs and batter.
• Mushroom pasta sauces poured over a large bed of noodles.
• Stuffed mushrooms filled with breadcrumbs, rice, or mashed potatoes.

In all of these dishes, the main carb source is the starch, not the mushrooms. Reading labels on canned soups and packaged sauces helps you see how much carbohydrate comes from the full recipe, not just the fungi.

Smart Swaps To Keep Mushroom Meals Lower Carb

You do not need to skip mushroom comfort dishes. Small adjustments keep the same flavors with fewer carbs:

• Thicken sauces with reduced cream, cheese, or a small amount of pureed cauliflower instead of flour.
• Bake or air-fry mushrooms tossed in oil and herbs, and skip the breading.
• Serve rich mushroom sauces over spiralized zucchini, steamed greens, or a small portion of whole-grain pasta instead of a full plate of white pasta.
• Stuff portobello caps with spinach, cheese, and chopped vegetables rather than bread-based fillings.

Approaches like these keep the carb cost of mushroom dishes close to the levels shown in the earlier tables, while still keeping meals satisfying and flavorful.

Quick Takeaways About Mushrooms And Carbs

The question “are mushrooms carbs?” sounds simple, yet the better way to look at it is this: mushrooms are low-carb non-starchy vegetables that contain a small amount of carbohydrate along with fiber, protein, and micronutrients. For most eating patterns, they help stretch meals, add flavor, and raise overall nutrient quality without adding many carbs.

• Most common mushrooms give only 2–5 grams of total carbs per 100 grams, with even fewer net carbs.
• Servings that match what people actually eat, such as 1 cup raw or 1/2 cup cooked, usually stay under 5 grams of net carbs.
• Mushrooms sit in the same group as other non-starchy vegetables on blood-sugar-friendly meal plans.
• The carb count jumps mainly when mushrooms come with breading, flour-based sauces, pasta, rice, or pastry.

If you track carbs for weight, blood sugar, or keto reasons, mushrooms are easy to keep on your plate. They bring plenty of savory depth for very little carbohydrate, as long as the rest of the dish matches your goals.

^*Values are rounded from large nutrient databases; actual numbers vary by variety, growing conditions, and cooking method.