[Big Poppa Smurf]

Quick question: I'm 6'2", 205. If I'm playing/coaching soccer 5 or 6x a week for around 2 hours each day, taking karate classes 4x a week for 1.5 hours each day, and I'm a teacher so I'm up and moving around all day, how many calories do I need to eat to maintain? I'm seeing ranges from 3500 to 6500 and I have no clue what is close to correct.

On a side note, apparently (according to BMI) the "normal" weight range for a 6'2" male is somewhere between 144 and 194, which is just ridiculous. 144!