Figuring out how many calories I need to eat in a day.

I am literally so confused.

I have people telling me to just go by what MFP sets as a goal for me. I have people telling me to to TDEE -20%, and every calculator I use gives me a different number. I also am not sure if i should put my activity level as sedentary since I work a desk job, or if I should do moderately active since I work out 5 times per week AFTER work.

Help, please? I have heard of something called IPOARM. I have no idea what this is. If somebody could clue me in?

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