i read on muscle mag about this. You first gotta calculate your BMR, and then multiply that by 1.75, or 1.9 and that should tell you how many calories you should intake to stay at your weight. To gain weight you should eat more calories and to lose weight you should subtract about 500 calories.
7000 calories is a crazy amount. Jay cutler ingests about 8000 off season but thats just him
you can find the website to calculate your BMR on google due to genetics this is just a basic guess. This isnt an exact guidline but an overall good resource