BFL does not count carb grams or calories.
But.... many people who have done BFL use an approximation for both carbs and protein .
Total bodyweight in pounds = grams of protein per day required (this is a fairly standard minimum ofr bodybuilding).
Carbs= same number. Add some healthy fat like olive oil, flax oil, etc.
If you are severely overweight this formula may not work well, in which case it should be adjusted down somewhat.
And it also didn't work for me; I'm small but maintain at about 20 calories per pound so that wasn't *enough* food for me. But for most people, it works great.
Laura