How many calories a day would be wise for a 10 year old?

I'm no doctor, but as long as your kid (or you) isn't (or aren't) overweight, there really shouldn't be a limit. Let you kid eat as much as he/ she can, assuming its a well rounded diet. The average calorie consumption for adults is between 1800-2400 a day. Use your judgment, 10 year old's are constantly growing, calories give the body energy to grow. I say let your kid eat as much healthy food as he' she would like.