I am right. We're all slightly different but I'm unaware of any human that defys the basic laws of thermodynamics.
By the way - a "reasonable" number of calories has no meaning. Context always matters.
The energy needs of a 6'9" male like me - differ from the energy needs of a 4'11" female. I can eat 2,000 calories and lose fat. A 4'11" female would plump up quite nicely on 2,000 calories.
If you want to count calories, figure out an aproximate caloric goal for the day. You can easily do this with a calorie calculator. Just keep in mind these are only aproximate figures.