Energy units

KCalories is an international unit and there are no choices, unlike Yards/Metres

In Watch App, My Watch, Health, make sure your personal data, age, weight etc is in there and you will get calories shown in Health and in Activity if you move around, do workouts etc,

Something wrong!

Red ring should be calories not minutes.

And I was wrong there is a choice of energy

I suggest you unpair the Watch and set it up again. If that does not fix it contact Apple Support directly

 Unpair and erase your Apple Watch – Apple Support (UK) 

and then 

Set up your Apple Watch – Apple Support (UK)

Hang on are you under 13 years old?

Red ring tracking minutes not calories - Apple Community