Personally on a day I do weights, now that I want to lose body fat (I'm 'cutting' so to speak) I'll eat at least 1,800, upwards of 2,200 (If I'm hungry). If I did cardio & weights I'd shoot for 2,200 to 2,400.
I had my Master-degreed exercise physiologist friend, who's been published with the journal of NSCA, do calculations for me. She said, "DO NOT, I repeat DO NOT go lower than 1,700 with your activity level if you don't want to lose LBM". -> which I don't.
I'm 24 YO, 5'4", 138# & body fat unknown but not too high (at that weight & height, I'm in a size 6, sometimes 8). I sit at a desk for 8 hours a day & in my car for 1.5-2 hrs, but otherwise I'm exercising or running around active.