That is generally a good place to start for an estimation, the only thing I personally don't like much about the basic 12x BW method is that it doesn't really take into account a person's lifestyle or exercise levels. I mean, lets face it, if you are a 10 hour a day construction worker, then your calorie needs are going to be more than double that of someone similar size and weight. If you have an average lifestyle, say you work in an office, do much of your work seated, but do some standing movement here and there, and your exercising is moderate as you say, then BW x 12 is probably a good place to start. What I think is even more important to remember is that you cannot just rely on any formula to get you exactly where you need to be right off the bat. Use a formula to get a good starting point, and then adjust your calories based on which way the fat is going. Coming off well? stay where you are. Coming back on? maybe you should lower your calories.