How much should I eat for maintenance?

Hi everyone. The last two weeks I have been eating 2800-3000 calories and have gained 6 pounds. So that makes me 15 years old, 119lbs, a bit over 5'4". I would like to maintain this weight. Today for exercise I did 30 minutes dancing (fairly active), 20 minutes hula hooping, lots of stair climbing throughout the day and about a mile walk. I ate around 2300-2400 today. I do this kind of activity 4-5 days a week and the rest I just walk and go up stairs. Do you think this is a good amount for maintenance? Thanks