BW x 15 is the common equation given for maintenance but you know as well as I do that no magic number works for everyone. Endormorphs require less and we know that ectomorphs require more. I doubt BW x 15 is your number, but it can be a good starting point. Remember that your macronutrient breakdown plays a role in how many calories you can eat as well. If you pound down junk food then even if you eat maintenance calories you may actually get fatter. If you eat good, clean foods with a higher protein intake with healthy fats and low GI carbs you may actually be able to eat more than maintenance.