Collards, raw has 39 kcal per 100 g, with 3 g of protein, 7 g of carbs, and 0.8 g of fat.
kcal per 100 g39
Values are from USDA FoodData Central, Foundation Foods, FDC ID 2685574 (opens usda.gov in a new tab). A food you buy can differ: check its label.