There are 71 dishes ranked on this page. The lightest is Salmon Nigiri at 93 kcal per 1 plate (2 pieces), the heaviest is Claypot Rice (Bo Zai Fan) at 1300 kcal per 1 pot (cured meat claypot rice), and the average lands around 634 calories a serving. 5 of them come in under 300 calories, and 45 are 600 or more.
That spread is the whole point. Two dishes off the same menu can be 1207 calories apart, which is more than most people's entire daily deficit. Knowing which is which costs you nothing and changes the outcome.