Proper way to calculate BMR?

[Deeman]

I have found close to 4 different ways to calculate BMR. The results are completely different for all 3. Let's take an example of a male who is 6' tall and 200lbs and 28yrs old.

Harris and Benedict equation: 2,035 cals at low activity rate
Katch-McArdle formula: 2,211
Quick method: 3,100
And the good ole fashioned 10-12x bodyweight = 2,000 - 2,400

So which is the accurate one? Any ideas?

[WBBIRL]

The best way to calculate your BMR is to monitor your cal intake for about 2 weeks and record your weight change. If it goes up then you know your above your BMR, if it goes down then you know your below your BMR and if it stays relatively the same then you know you've found your BMR. Just keep adjust the number of cals your eating and record how your bodyweight fluctuates... sooner or later you will have a very very close idea of what your exact BMR is.