So how many gram of carbs do i need per kg??
As per Bryan's article and my recommendations as well, you should figure out how many calories total you need, then figure the percentage from fat, subtract that, figure how many calories you are getting from protein, subtract that... and what you are left with is how many calories you should be consuming from carbohydrates. For example, here is my current diet breakdown:
calorie target: 4600
25% from fat = 1150 (appx 130 grams of fat)
400 grams of protein = 1600 calories
Remainder = 1850 calories from carbs
1850 calories = appx 460 grams of carbs
This is just an example on how to do the math. As always, calories should be based on bodyweight with modifiers for activity level, etc if necessary. Always figure carbs last once you satisfy your fat and protein requirements. Fat is important for a variety of reasons including hormonal balance and maintaining joint health, protein is obvious and without carbs you will find it exceedingly difficult to build strength or tolerate a decent amount of volume in your workouts. As for what fats, proteins, carbs, that is a different debate.