well......the reason for our responses is due to the "DUH" factor..............but altho i didnt test this guys formula because i got a website for that...it could be right.....its ESTIMATING your maintnance calories, which if you were 275 and a fat ass than 4200 cals per day is what it would take for you to MAINTAIN your current fat assenes.....

Why does it matter if hes a fat ass or muscular?

It doesn't, it goes by total body weight. (muscular, or fat) Although, the more muscle you have, the more calories you burn...But, lets not get into that and keep this simple... About 6 extra calories per pound of muscle according to Lyle

BMR is calculated by weight, height, age, etc...These are just guidelines, but everyone is different.

If you weigh 275lbs, you obviously eat a lot...4000 calories sounds like a lot, but it really isn't...To get up to that weight, you must have been eating big, hence a higher calorie maintenance to keep you big.

That's why people say: "If you wanna get big, eat big." It doesn't just happen by eating your fruits and veggies...Some of these people who weigh 300lbs eat 6000-7000 calories a day and don't even realize it...

Here is a simple calculator.

BMR Calculator

C6zo6,
Thanks for the link. According to that calculator, my BMR is ~2400 cal.
That makes more sense as I have been sticking to 2500 cal/day using fitday with at least 200g protein and 100g fat and lifting heavy and my weight hasn't moved. I will bring it down to 2000 cal and see what happens

Dave