Short rib is a fatty cut, and the soup does not hide it. 200g of bone-in ribs, about 3 pieces, is 340 calories on its own with roughly 24g of fat. Well-run restaurants chill the broth overnight and skim the fat cap, which is why some bowls are 350 and others are 600. If there is a visible oil layer on top, assume the higher number.
The broth is otherwise honest. It is beef bone stock with radish, and 400ml is about 60 calories, less if skimmed. The 30g of glass noodles at the bottom add 45 calories, and the egg garnish and scallion another 25. Compared with seolleongtang at 425 with noodles, galbitang is close, just with more meat and more fat per bowl.
The rice is the choice. Galbitang comes with a bowl of rice, and the habit is to tip it into the soup, which is 300 calories and easy to finish because the broth makes it slide down. 770 calories with 34g of protein is a solid lunch. The 1,050 calorie version is when you take the second bowl of rice that the ajumma offers.