Kale does contain carbohydrates, but it’s not what most people mean when they talk about “carbs.” A cup of raw chopped kale has just 6.7 grams of total carbohydrates, and a significant portion of that is fiber your body doesn’t digest for energy. Nutritionally, kale is classified as a non-starchy vegetable, placing it in a completely different category from carb-heavy foods like bread, rice, or potatoes.
What’s Actually in a Cup of Kale
One cup of raw chopped kale contains 6.7 grams of carbohydrates, 2.2 grams of protein, and less than half a gram of fat. Of those 6.7 grams of carbs, about 1.3 grams come from dietary fiber. That leaves roughly 5.4 grams of “net carbs,” which is the portion that actually raises blood sugar. For perspective, a single slice of white bread has around 13 grams of net carbs, more than double what you’d get from a full cup of raw kale.
The carbohydrates in kale are a mix of simple sugars (primarily fructose and glucose) and more complex structures like hemicellulose, a type of plant fiber. Kale also contains small amounts of sugar alcohols and prebiotic carbohydrates that feed beneficial gut bacteria rather than spiking your blood sugar.
Kale’s Effect on Blood Sugar
Kale has a glycemic index of just 5, which is extremely low. For comparison, the scale runs from 0 to 100, and anything under 55 is considered low-glycemic. At 5, kale barely registers. This means eating kale causes almost no rise in blood sugar, making it a safe choice for people managing diabetes or watching their glucose levels.
The fiber in kale contributes to this effect. Kale is particularly rich in insoluble fiber, the kind that doesn’t dissolve in water and helps move food through your digestive system. It also contains some soluble fiber, which forms a gel-like substance in your gut that slows digestion and helps prevent blood sugar spikes after meals. Soluble fiber has the added benefit of binding to bile acids, which can help lower blood cholesterol over time.
How Kale Fits Into Low-Carb and Keto Diets
Kale is one of the most keto-friendly vegetables you can eat. Ketogenic diets typically limit daily carbs to 20 to 50 grams. With only about 5.4 net carbs per cup of raw kale, you could eat several servings a day and still stay well within that range. Healthline lists dark leafy greens like kale, spinach, and collard greens among the top foods for a ketogenic diet, noting that they “add bulk to your meals without drastically increasing the carb count.”
If you’re tracking net carbs on a low-carb diet, kale gives you a lot of nutritional value for very few carbs. It’s packed with vitamins K, A, and C, along with iron and calcium. You get a nutrient-dense food that fills your plate without taking a meaningful bite out of your daily carb budget.
Raw vs. Cooked Kale
Cooking kale concentrates its nutrients because the leaves shrink as they lose water. One cup of boiled, drained kale contains 7.3 grams of carbohydrates and 2.6 grams of fiber. That’s a slight increase over raw kale’s 6.7 grams of carbs and 1.3 grams of fiber, but the difference is mostly because you’re fitting more actual kale into a cup once it’s wilted down. The fiber nearly doubles per cup when cooked, which means the net carb count stays comparable to raw kale.
How Kale Compares to Other Vegetables
Among popular green vegetables, kale sits on the lower end for carbohydrates. Here’s how a cup of each compares when cooked:
- Cooked kale: 6.9g carbs, 5.2g fiber
- Cooked spinach: 6.8g carbs, 4.3g fiber
- Cooked broccoli: 11.2g carbs, 5.1g fiber
Kale and spinach are nearly identical in total carbs, but kale edges ahead with slightly more fiber. Broccoli has considerably more carbohydrates per cup, though it’s still a low-carb vegetable by any standard. All three are non-starchy vegetables that behave nothing like grains, legumes, or root vegetables in terms of their impact on blood sugar and overall carb load.
So while kale technically contains carbohydrates, calling it “a carb” would be misleading. It’s a leafy green vegetable with minimal sugar, generous fiber, and virtually no effect on blood sugar. For anyone counting carbs, kale is one of the last foods you’d need to worry about.