How much can a 300 pound person lose in a week?
Say you start at 300 pounds—a goal of one percent fat loss per week means you’ll shed three pounds in a week.
Regarding this, How many calories should I eat at 300 pounds? Estimating Calorie Needs for a 300-Pound Man
Using this estimate, a sedentary 300-pound man would need about 4,200 calories per day to maintain his weight. To lose each pound of fat, you need burn 3,500 calories more than you eat.