6'1, about 200lbs when at my leanest (15% or so body fat). 3100 sounds very high to me for your weight unless you're all muscle and very active, but very much in line with the kind of recommendations I'm used to seeing.

But your experience will vary massively depending on how active you are, including how hard you hit the gym.

It's not impossible it's right, but really just count for a few weeks and keep track of your weight, and then adjust up/down up to a few hundred kcal until your weight is changing the way you want it tp.

Unless you're super-lean there's very little reason to add more than 300-400 kcal above maintenance at most (I do less these days) - big bulking cycles take a lot of discipline to break out of. I generally favour slow but steady these days as I'm back into lifting.

Age also factors in - you can expect slower progress the older you get and accordingly you'll need fewer extra calories if you want to avoid adding fat. Conversely, if your testosterone levels and metabolism are at their peak, you might well burn more.

Counting and tracking is really the only thing that will tell you the right numbers for you.