There are 32 dishes ranked on this page. The lightest is Miso Soup at 40 kcal per 1 bowl (tofu and wakame), the heaviest is Katsu Curry at 1116 kcal per 1 plate (rice 300g), and the average lands around 473 calories a serving. 8 of them come in under 300 calories, and 9 are 600 or more.
That spread is the whole point. Two dishes off the same menu can be 1076 calories apart, which is more than most people's entire daily deficit. Knowing which is which costs you nothing and changes the outcome.