Broccoli does contain carbohydrates, but it’s one of the lowest-carb vegetables you can eat. A full cup of raw broccoli has only about 6 grams of total carbs, and once you subtract the fiber your body can’t digest, you’re left with roughly 3.4 grams of net carbs. That puts broccoli firmly in the “free food” category for most low-carb and keto diets.
How Many Carbs Are in Broccoli
Per 100 grams of raw broccoli (a little over a cup of chopped florets), you get 6.64 grams of total carbohydrates. That total breaks down into two parts: fiber and digestible carbs. Raw broccoli contains about 3.5 grams of dietary fiber per 100 grams, which your body doesn’t convert to blood sugar. The remaining 3 to 4 grams are the carbs that actually affect your energy and blood sugar levels.
For perspective, a medium banana has about 27 grams of carbs. A slice of white bread has around 13 grams. You’d need to eat roughly three full cups of broccoli to match a single slice of bread in digestible carbohydrates. So while broccoli is technically a carbohydrate-containing food, calling it “a carb” the way you’d call rice or pasta a carb would be misleading.
Net Carbs and Why They Matter
Net carbs are what most people tracking their intake actually care about. The calculation is simple: total carbohydrates minus fiber equals net carbs. For one cup (90 grams) of raw broccoli, that comes out to around 3.4 grams of net carbs.
The fiber in broccoli is mostly insoluble, about 3 grams per 100 grams in raw form, with a smaller amount of soluble fiber at roughly 0.4 grams. Insoluble fiber adds bulk and passes through your digestive system largely intact. Soluble fiber dissolves in water and forms a gel that slows down digestion. Interestingly, cooking changes this ratio. Microwaved broccoli contains about 1.85 grams of soluble fiber and 2.81 grams of insoluble fiber per 100 grams, nearly quadrupling the soluble fiber content compared to raw. This means cooked broccoli may do a better job of slowing glucose absorption after a meal.
Broccoli on Keto and Low-Carb Diets
Most keto guidelines recommend staying under 50 grams of carbs per day to maintain ketosis. Broccoli contains just 4.04 grams of net carbs per 100 grams, which means you could eat about 1,000 grams of broccoli (over two pounds) before hitting that 50-gram ceiling. In practice, nobody eats two pounds of broccoli in a day, so it’s one of the safest vegetables to include on a ketogenic diet.
A typical side serving of broccoli, around one to two cups, will run you 3 to 7 grams of net carbs. That leaves plenty of room for other foods throughout the day. This is why broccoli appears on virtually every keto-friendly food list, alongside cauliflower, spinach, and zucchini.
Blood Sugar Impact
Broccoli has a glycemic index of just 10, which is extremely low. For comparison, pure glucose scores 100, white bread lands around 75, and most fruits fall between 40 and 60. A glycemic index of 10 means broccoli causes almost no spike in blood sugar after you eat it.
The fiber plays a key role here. It slows glucose absorption in the gut, which helps blunt the insulin response that follows a meal. This effect extends beyond just the broccoli itself. Eating broccoli alongside higher-carb foods can moderate the overall blood sugar impact of the meal. The soluble fiber in cooked broccoli is particularly effective at this, forming a gel-like substance that slows the rate at which sugars enter your bloodstream.
Why Broccoli Feels Filling Despite Low Calories
One cup of raw broccoli has only about 31 calories, yet it tends to keep you satisfied far longer than those numbers would suggest. The fiber content is a big part of this. It absorbs water and expands in your stomach, sending fullness signals to your brain. The high water content of broccoli (about 90% by weight) adds volume to your meal without adding calories.
This combination of fiber, water, and low calorie density makes broccoli useful for weight management. It fills physical space in your stomach, slows digestion, and helps prevent the blood sugar crashes that trigger cravings. People who swap in whole vegetables like broccoli for refined carbs often notice they snack less between meals, a pattern consistent with fiber’s effect on steady blood sugar levels.
How Broccoli Compares to Other Vegetables
- Cauliflower: About 3 grams of net carbs per cup, slightly lower than broccoli. The two are nearly interchangeable from a carb perspective.
- Carrots: Around 7 grams of net carbs per cup, roughly double broccoli’s count. Still moderate, but they add up faster.
- Peas: About 14 grams of net carbs per cup. These are one of the higher-carb “vegetables” and can make a real dent in a daily carb budget.
- Spinach: Roughly 0.4 grams of net carbs per cup raw. One of the very lowest-carb options available.
- Potatoes: Around 26 grams of net carbs per cup. This is what most people think of as a “carb vegetable,” and it’s in a completely different category than broccoli.
Broccoli sits at the low end of the spectrum, closer to leafy greens than to starchy vegetables. If you’re watching carbs for any reason, whether for keto, diabetes management, or general health, broccoli is one of the least concerning vegetables you can put on your plate.