There are 119 dishes ranked on this page. The lightest is Bosou at 35 kcal per 2 tbsp condiment portion, the heaviest is Yakiniku at 1000 kcal per 1 person (200g meat with rice), and the average lands around 391 calories a serving. 31 of them come in under 300 calories, and 8 are 600 or more.
That spread is the whole point. Two dishes off the same menu can be 965 calories apart, which is more than most people's entire daily deficit. Knowing which is which costs you nothing and changes the outcome.