Teach me about TDEE

Rage_Phish

I am interested in this approach, but am having a very hard time calculating my information. I just did it and it said my daily calorie requirement is 3640. If this is true I'm eating WAY below that when i use the MFP settings (currently eating 1930). Can someone please help me with the calculations? And also school me on the method, reasons, and advantage to this strategy?

male
29 years old
201 lbs
sit at a desk 8 hours a day
2 hour commute sitting on a train round-trip
60 minutes of weight lifting M/W/F (strong lifts 5x5)
40 minutes of cardio T/TH/SA (rest day sunday)
Sleep 7 hours a night

is there any other info needed?

Thanks for any help and advice!