Broccoli does contain carbohydrates, but it’s one of the lowest-carb vegetables you can eat. A full cup of raw chopped broccoli has just 6 grams of total carbs, and nearly half of that is fiber your body doesn’t absorb. That puts broccoli firmly in the “non-starchy vegetable” category, far from the carb-heavy foods most people have in mind when they ask this question.
How Many Carbs Are in Broccoli
One cup (91 grams) of raw chopped broccoli contains 6 grams of total carbohydrates, 2.5 grams of fiber, and about 2 grams of natural sugar. If you subtract the fiber (which passes through your digestive system without raising blood sugar), you’re left with roughly 3.5 grams of net carbs per cup. For context, a medium banana has about 27 grams of carbs, and a cup of cooked rice has around 45 grams.
Cooking changes the numbers slightly, but not by much. One cup of boiled, drained broccoli has 5.6 grams of total carbs and 2.6 grams of fiber, landing at about 3 grams of net carbs. Boiling actually leaches some of the soluble sugars into the cooking water, which is why cooked broccoli can end up with marginally fewer carbs per cup than raw.
What Kind of Carbs Broccoli Contains
Not all carbohydrates behave the same way in your body. Broccoli’s carbs come mostly from fiber and small amounts of natural sugar. There’s very little starch. This matters because fiber slows digestion, feeds beneficial gut bacteria, and doesn’t spike your blood sugar the way starch or added sugar does.
A half-cup serving of broccoli provides about 2.4 grams of fiber, split roughly evenly between soluble and insoluble types. Soluble fiber dissolves in water and helps manage cholesterol and blood sugar levels. Insoluble fiber adds bulk that keeps things moving through your digestive tract. Getting both types from a single food is a nice bonus.
Broccoli’s Effect on Blood Sugar
Broccoli has a glycemic index of just 10 out of 100. That’s extremely low. For comparison, foods scored under 55 are considered low-glycemic, and most starchy foods like white bread or potatoes land between 70 and 90. A glycemic index of 10 means broccoli causes almost no measurable rise in blood sugar after eating it. Combined with its low total carb count, broccoli is one of the safest vegetable choices for people managing blood sugar.
Does Broccoli Fit a Low-Carb or Keto Diet
Yes, and it’s one of the most popular vegetables on ketogenic and low-carb plans for good reason. Most keto diets aim for 20 to 50 grams of net carbs per day. At roughly 3.5 net carbs per cup, you could eat two full cups of broccoli and still use only a fraction of that budget. It’s filling, versatile, and pairs well with the higher-fat foods common on these diets.
Broccoli compares favorably to other go-to low-carb vegetables. Cauliflower, often considered the gold standard for keto cooking, has about 5.5 grams of total carbs and 2 grams of fiber per cup, giving it the same 3.5 grams of net carbs as broccoli. Spinach and zucchini are slightly lower, but the differences are small enough that preference and variety matter more than optimization.
How Cooking Changes the Carb Content
Steaming preserves the most nutrients overall, including soluble sugars and proteins. Boiling causes the greatest loss of soluble sugars because they leach into the water. Stir-frying falls somewhere in between. If you’re trying to minimize carbs, these differences are tiny in practical terms. A gram or two per serving won’t change the math for most people. Choose whichever cooking method you actually enjoy, since the real nutritional win is simply eating broccoli regularly.
Why Broccoli Is Worth Eating Beyond Carb Counts
Focusing only on carbs misses the bigger picture. One cup of cooked broccoli delivers 112% of your daily vitamin C and 92% of your daily vitamin K. Vitamin C supports immune function and helps your body absorb iron from plant foods. Vitamin K is essential for blood clotting and bone health. Few foods pack that much into so few calories.
Broccoli also contains sulforaphane, a compound produced when you chew or chop the florets. This compound has been widely studied for its role in supporting the body’s natural detoxification processes and reducing inflammation. Chopping broccoli and letting it sit for a few minutes before cooking gives this compound more time to form, which heat can otherwise interrupt.