Steamboat is one of those meals that feels healthy because you are cooking everything in hot water, but the number can surprise you. The baseline estimate is around 750 calories per person for a standard mixed plate in clear broth, and that is genuinely a decent meal: 48g of protein, 65g of carbs, reasonable fat. The catch is that this is a rough ballpark. Hard data on steamboat is thin because every table orders differently, every shop uses a different recipe, and nobody is weighing their prawns at a steamboat restaurant. So treat 750 as a reasonable middle ground, not a lab result.
What actually moves the number is the broth and the processed stuff. Mala broth can add 400 to 600 calories on its own before you put a single prawn in the pot. The processed items like fish balls, tofu puffs, and crabsticks are sneaky too, about 110 calories in just 60g because they are made with starch and oil. Noodles add another 210 calories for 60g dry weight. If you want to keep steamboat under 500 calories, the formula is simple: clear broth, lean chicken or seafood only, load up the veg (150g of cabbage and mushrooms is only 60 calories), and skip the noodles. You will still leave the table full, bro.