2,000 calories per day is said to be the recommended number for the average American male. However, this seems to be a tad high. The general rule of thumb to regulate your weight is to take your target, and multiply by ten. So, if you are trying to get down to 150, your daily allowance should hover around the 1,500 range. Of course, if you are a larger chap, and 200 or more is your target, 2,000+ would definitely follow this formula, but for the average-sized American, it is not quite necessary.
How much exactly is 2,000 calories? Here is a great video that gives you an idea of what it looks like using common household foods as a measuring stick. Some may surprise you, either in a good or bad way.That said, I have never counted calories a single day in my life, and am not a huge fan of it, as it often creates a counterproductive, unhealthy obsession. The best way to ensure that you don't go overboard for the day? Intermittent fasting. There are, of course, many methods of intermittent fasting, but what I prefer is NO breakfast, something light and non-carby if possible for lunch (lunch is optional), and a satisfying dinner, with the window between the first and last food consumption of the day being between 4 to 8 hours. So, if your first caloric intake happens at 1 pm, make sure that the last thing you consume occurs no later than 9 pm.
Using this schedule, unless you wolf down an entire pizza for dinner, there is much less possibility that you will go above your desired daily caloric intake.
-E