There are 92 dishes ranked on this page. The lightest is Yen Ta Fo at 290 kcal per 1 bowl, the heaviest is Beef Chow Fun (Gon Chau Ngau Ho) at 970 kcal per 1 plate, and the average lands around 511 calories a serving. 2 of them come in under 300 calories, and 25 are 600 or more.
That spread is the whole point. Two dishes off the same menu can be 680 calories apart, which is more than most people's entire daily deficit. Knowing which is which costs you nothing and changes the outcome.