Counting calories while on ketogenic diet is very individual. It truly depends on how your body works and adapts to this diet. Number one rule of keto is balancing the macros at less than 5% carbohydrates, about 15% proteins, and 80% or more fats.
HOWEVER… there are times when counting calories is less or more necessary.
DONT WATCH CALORIES IF: 1. you are trying to get into ketosis (eat fat fat fat!) or 2. if you are maintaining your desired weight
WATCH CALORIES IF: 1. you are trying to gain weight (mass) 2. you are trying to reduce weight (use a keto calculator to detemine your calorie needs – my favorite one is on Maria Emmerich and can be easily googled) 3. if you have tendency to either over or under eat.