Are There Carbs In Mushrooms? | Smart Low Carb Facts

When you type “are there carbs in mushrooms?” into a search box, you are usually trying to solve one problem: can you pile them on your plate without blowing your carb budget. Mushrooms sit in an odd spot in many minds. They feel light and vegetable-like, yet they taste rich and meaty. That mix raises fair questions for anyone tracking carbs for weight loss, blood sugar, or keto goals.

The short version is reassuring. Fresh mushrooms do contain carbohydrates, but the amount is small compared with grains, starchy sides, or even some other vegetables. Most of that carbohydrate is tied up in fiber and a small amount of natural sugar. That makes mushrooms one of the easiest ingredients to work into low carb meals, as long as you stay mindful of sauces, breading, and other add-ins.

Basic Nutrition Snapshot For Mushrooms

Let’s start with the plain numbers. A typical serving of plain raw white mushrooms is mostly water, with a little protein, very little fat, and a small amount of carbohydrate. For 100 grams of white mushrooms, you are looking at roughly 3 grams of total carbohydrate, about 1 gram of fiber, and only around 20–22 calories.¹

That picture holds across most common varieties. Some specialty mushrooms run a bit higher, some a bit lower, yet they still live in the low carb range. Health and nutrition resources such as the
Harvard Nutrition Source describe mushrooms as low in calories and fat with modest fiber and helpful nutrients, which lines up with these numbers.²

Mushroom Type (Raw Unless Noted)	Total Carbs (g) Per 100 g*	Dietary Fiber (g) Per 100 g*
White Button	≈ 3.3	≈ 1.0
Crimini / Brown	≈ 3.7–4.1	≈ 0.5–0.6
Portobello	≈ 3.8–4.4	≈ 2.5
Shiitake	≈ 6.5–6.8	≈ 2.5–3.0
Oyster	≈ 6.0–6.4	≈ 2.0–2.3
Enoki	≈ 7.8	≈ 2.7
Cooked White (Sautéed)	≈ 5.3	≈ 2.2

*Values rounded from nutrient databases; actual figures vary by source, growing conditions, and cooking method.

Even at the higher end of that range, these mushrooms still sit in low territory compared with staples like rice, pasta, potatoes, or bread. Once you subtract fiber to get “net carbs,” the load drops even more, which matters for low carb and keto eaters who focus on digestible carbohydrate.

Carbs In Mushrooms By Type And Serving

Numbers per 100 grams are handy for labels and databases, yet most people eat mushrooms by the cup, slice, or cap. That is where carb counts start to feel real. A cup of sliced raw white mushrooms holds about 2–3 grams of total carbohydrate and roughly 1 gram of fiber, so net carbs land around 1–2 grams for that whole cup.³

Raw Mushroom Carb Counts

Here is how common raw servings stack up:

• 1 cup sliced white or crimini mushrooms: about 2–3 g total carbs, ~1–2 g net.
• 1 cup sliced oyster mushrooms: about 5 g total carbs, with a couple of grams of fiber, so net around 3 g.⁴
• 1 cup raw mixed mushrooms: still usually under 5 g total carbs, since all listed types are low.

These values put a generous handful of raw mushrooms in the same carb range as other non-starchy vegetables. Diabetes guidance often treats a serving of non-starchy vegetables as around 5 grams of carbohydrate or less, which fits mushrooms neatly inside that category.⁵

Cooked Mushroom Carb Counts

Cooking changes the picture a bit, not because mushrooms gain carbohydrate, but because they lose water and shrink. A half cup of cooked sliced mushrooms is denser than a half cup of raw slices, so it will deliver more grams of carbs per spoonful, even though the carb count per 100 grams stays close.

In practice, a half cup of cooked white or portobello mushrooms usually gives you:

• Roughly 3–4 g total carbohydrate.
• About 1–2 g fiber, depending on the mix of varieties.
• Net carbs in the 2–3 g range for that serving.

Sauces, cream, flour, or breading can add a lot of extra carbohydrate, so the leanest numbers apply to plain grilled, sautéed, or roasted mushrooms with simple seasonings.

Low Carb And Keto Eating With Mushrooms

With net carbs this low, mushrooms slide easily into many low carb and keto approaches. They help add bulk, flavor, and texture where you might otherwise use pasta, rice, or bread. At the same time, they bring B vitamins, minerals such as potassium and copper, and special fibers called beta-glucans that support gut health.⁶

Net Carbs In Everyday Portions

To keep things practical, it helps to think in everyday serving sizes instead of grams on a label:

• 1 cup raw sliced white mushrooms in a salad: around 1–2 g net carbs.
• ½ cup sautéed mushrooms on a steak or burger: around 2–3 g net carbs.
• One grilled portobello cap used as a “bun”: similar to a half cup of cooked slices, so about 3 g net carbs.

In a typical 20–50 gram daily carb range for low carb or keto eating, those amounts take up a very small slice of the total allowance, while making meals more satisfying.

Using Mushrooms To Stretch Higher Carb Ingredients

Another handy trick is using mushrooms to reduce the carb density of mixed dishes. Finely chopped mushrooms can stand in for part of the meat or starch in sauces and fillings. That swap lowers calories and carbs while keeping volume and flavor.

• Mix chopped mushrooms into ground beef or turkey for meatballs, burgers, or taco filling.
• Stir sautéed mushrooms into omelets or frittatas instead of shredded potatoes.
• Use mushroom “rice” or finely chopped mushrooms under stir-fries instead of grain rice.

Because the carb count stays low, you get extra chew and savor without pushing the numbers far upward.

Comparing Mushrooms To Other Vegetables

It also helps to see where mushrooms sit beside other vegetables on a carb-per-serving scale. Nutrition guidance for people with diabetes often groups mushrooms with non-starchy vegetables, where a standard serving of ½ cup cooked or 1 cup raw usually has about 5 grams of carbohydrate or less.⁵

That means a pile of mushrooms often carries fewer carbs than the same cooked volume of carrots, peas, or corn, and sits roughly in line with leafy greens or cruciferous vegetables. Still, each vegetable brings a different mix of nutrients, so variety across the day remains helpful.

Food	Common Serving Size	Approx. Net Carbs (g) Per Serving*
White Mushrooms	1 cup raw, sliced	≈ 1–2
Broccoli Florets	1 cup cooked	≈ 5
Zucchini	1 cup cooked slices	≈ 3
Cauliflower	1 cup cooked florets	≈ 3–4
Spinach	1 cup cooked	≈ 4
Bell Pepper	1 cup raw strips	≈ 4–5
Mixed Non-Starchy Vegetables	1 cup cooked	≈ 3–5

*Net carb estimates based on typical values for non-starchy vegetables; actual figures vary by brand, recipe, and cooking method.

The main takeaway from this comparison is simple: mushrooms rank among the lower carb options on an already low carb list. For someone aiming to fill half a plate with non-starchy vegetables, mushrooms help keep that half of the plate gentle on blood sugar.

Practical Tips For Eating Mushrooms

Carb numbers answer the “how much” side, yet a few habits make those numbers work better in daily life. These points can help you use mushrooms in a way that matches both appetite and goals.

Watch What Gets Added

Plain mushrooms carry very few carbs, but what you cook them with can change the picture. Creamy sauces, flour-thickened gravies, sugary marinades, and breadcrumb toppings all add starch or sugar.

• Sauté mushrooms in olive oil or butter with herbs instead of heavy cream sauces.
• Use dry rubs or simple oil-based marinades instead of sweet bottled sauces.
• Skip breading and choose grilled or roasted mushrooms instead.

These small shifts keep the base ingredient low carb while still giving you depth of flavor.

Portion Sizes For Different Carb Targets

Because mushrooms are so light on carbs, most people have plenty of room in a daily allowance. Still, portion awareness helps if your carb target is very tight.

• Moderate low carb (around 75–100 g carbs per day): 1–2 cups of mushrooms across meals is usually easy to fit.
• Stricter low carb or keto (around 20–50 g carbs per day): you can still enjoy 1–2 cups of mushrooms, as long as higher carb sides stay in check.
• Very strict medical carb limits: follow your care team’s instructions first and match mushroom servings to that plan.

If you count carbs for diabetes or another medical reason, your doctor or dietitian can help you plug mushrooms into your personal meal plan alongside other non-starchy vegetables.

Dried Mushrooms And Powdered Products

Fresh mushrooms are mostly water, yet dried mushrooms and mushroom powders are far more concentrated. A small handful of dried slices can match the carb content of a much larger pile of fresh mushrooms because the water has been removed.

That does not make dried products “high carb,” but it does mean you should read labels and keep scoops modest if you use mushroom powders in drinks, soups, or sauces. Look for added starches such as maltodextrin on ingredients lists, since these add carbs that do not appear in plain fresh mushrooms.

Are There Carbs In Mushrooms? Main Takeaways

By now the question “are there carbs in mushrooms?” should feel much less mysterious. The answer is yes, there are carbs, yet the amount is small and mostly tied to fiber and natural sugars. For most people, mushrooms are one of the easiest foods to work into a carb-conscious pattern.

Across common varieties, 100 grams of raw mushrooms usually brings only 3–7 grams of total carbohydrate and 1–3 grams of fiber. A cup of raw slices lands near 2–3 grams of total carbs, and a half cup of cooked slices stays in the low single digits. Those figures place mushrooms squarely among other non-starchy vegetables on major nutrition and diabetes education lists.^2,5

In practice, that means you can use mushrooms to bulk up meals, add savory depth, or stand in for higher carb ingredients while keeping your totals steady. Stay alert to sauces and breading, keep portions aligned with your personal carb target, and you will get full benefit from this low carb, nutrient-dense ingredient.