How many calories?

Does it matter how many calories I eat while in Ketosis with less than 20g carbs? I'm 6ft, 225 lbs, and 26. Obviously I shouldn't be eating 3000+ calories a day, but I'm wondering if I can eat 2500 and still lose weight. I can't really work out due to a spinal cord injury, so its pretty easy to boredom eat. I keep hearing that its hard to put on fat when in deep ketosis, but I still see people using calorie restrictions. What is the correct way to do this?