One 100 g serving of cabbage, chinese (pak-choi), raw has 13 calories, 2.2 g of carbs, and 1 g of fiber.
Full macro and micronutrient breakdown, plus how this compares across diets, is on the Cabbage, chinese (pak-choi), raw nutrition facts page.
Source: USDA FoodData Central - SR Legacy (2018-04)