How often do you recalculate + determine calories?

Preface: I do NOT use the MFP food or exercise tracking. I like to eat about the same amount every day (just easier for me), plus my activity really varies from weekdays to weekends, so I use other calculators and go through a bit of a process to determine my goals.

That being said, how often do you review your calorie goals/needs? What are your triggers to alert you that maybe that needs some attention? Do you have a strict number you shoot for, or a range?

Overall my recomp has been going pretty steady (measurements), and my workouts are going great (that's the priority right now!). But I was really struggling with hunger with this last increase in the intensity of my program, and noticed that I was getting a lot more cravings for "bad" food (fast food, pizza, the like). Went back in and re-calculated everything with the new workouts in mind, and it appears I may have been under eating a bit. Not a huge amount, but 100-300 calories a day, which could easily explain the cravings.

Weight hasn't changed, workouts have. I give myself a range that ranges from a ~1lb/week "loss" at my current weight to what should be about maintenance at my "goal" weight. Just allows for a bit more flexibility while still staying in some kind of deficit.

Just curious what others have found works for them and their situations!