A cup of raw chopped collard greens has just 12 calories, making them one of the lowest-calorie vegetables you can eat. Even after cooking, when the leaves wilt down and you can fit much more into a cup, a full cup of boiled collard greens contains only about 49 to 62 calories depending on how long you cook them.
Calories by Serving Size and Preparation
Raw collard greens are mostly water, so the calorie count stays remarkably low no matter how you measure them. One cup of raw chopped leaves (about 36 grams) has roughly 12 calories. Two cups of raw greens, a more realistic salad-sized portion, come in around 24 calories with 4 grams of carbs, 2.8 grams of fiber, 2 grams of protein, and less than half a gram of fat.
Cooking changes the math because the leaves shrink dramatically. A large bunch of raw collard greens cooks down to a fraction of its original volume, so a cup of cooked greens represents far more leaves than a cup of raw ones. One cup of boiled, drained collard greens (without any added fat) contains roughly 49 to 62 calories, 5 grams of protein, and over 5 grams of fiber. That’s still extremely low for a full cup of cooked food.
The calorie jump from raw to cooked isn’t because cooking adds calories. It’s simply because you’re packing more leaves into the same measuring cup once they’ve wilted. Gram for gram, the calorie content stays the same.
Where the Calories Come From
Almost all the calories in collard greens come from carbohydrates and a small amount of protein. Fat is nearly nonexistent at under half a gram per serving. A significant portion of those carbs is fiber, which your body doesn’t fully absorb for energy. That means the usable calories are even lower than the label suggests.
What drives up the calorie count in most collard green dishes is everything else in the pot. Traditional Southern-style collard greens cooked with ham hocks, bacon, or butter can easily reach 150 to 250 calories per cup or more, depending on how generous you are with the fat. A tablespoon of olive oil alone adds 120 calories. If you’re tracking calories, the greens themselves are almost negligible. It’s the cooking fat, smoked meat, and seasoning oils that matter.
Nutrient Density Beyond Calories
Collard greens pack an unusual amount of nutrition for so few calories. A cooked cup delivers over 5 grams of dietary fiber, which is roughly 20% of what most adults need in a day. That same cup provides 5 grams of protein, a surprisingly high amount for a leafy green. They’re also rich in vitamin K, vitamin A, vitamin C, and calcium, nutrients that are sometimes hard to get enough of from vegetables alone.
The calcium in collard greens is worth noting because, unlike spinach, collard greens don’t contain high levels of compounds that block calcium absorption. Your body can actually use a good portion of the calcium these greens provide, which makes them one of the better plant-based calcium sources available.
How Cooking Method Affects Nutrition
The way you cook collard greens affects more than just taste. USDA research on cruciferous vegetables found that steamed collard greens had a significantly higher capacity to bind bile acids compared to raw, boiled, or sautéed preparations. Bile acid binding is linked to cholesterol-lowering potential, because when bile acids are trapped by fiber in the gut, your body pulls cholesterol from the bloodstream to make more.
Boiling collard greens for a long time, the traditional method, can leach water-soluble vitamins like vitamin C into the cooking liquid. If you drink the “pot liquor” (the broth left after cooking), you recapture some of those nutrients. Steaming or quickly sautéing preserves more vitamins in the leaves themselves. For the lowest calorie preparation that retains the most nutrition, steaming for a few minutes until the leaves are tender is the best approach.
Comparing Collard Greens to Other Leafy Greens
- Spinach: About 7 calories per raw cup, slightly lower than collard greens, but with less fiber and calcium that’s harder for your body to absorb.
- Kale: Around 7 to 8 calories per raw cup, similar protein content, but a tougher texture when raw.
- Swiss chard: Roughly 7 calories per raw cup with comparable vitamins but lower fiber.
- Romaine lettuce: About 8 calories per cup, but with significantly less fiber, protein, and overall nutrient density.
Collard greens sit at the top of leafy greens for fiber content and are among the best for calcium. Their slightly higher calorie count compared to spinach or kale is a direct result of having more fiber and protein per leaf, which is a nutritional advantage rather than a drawback.