Just my two cents but I hate the concept of trusting a cardio machine for cals burned and then factoring that into calorie allowance. Those things can't be accurate.Let me do some foxy brown math on this
his bmr is 2500 calories to maintain his weight
1 hour on the treadmill = 800 cals
1800 calorie diet = -700
1500 caloric deficit per day
10,500 caloric deficit per week
Divide by 3500 and we can have homeboy losing 3 pounds a week.
12 pounds a month.
48 pounds in 4 months which would put him at 236.
Probably have him rocking size 36 jeans by november. Size 34 if they got spandex
To @CashmereEsquire point. He is likely going to want to change body composition which means lifting. Might as well start know.