Fitbit and TDEE

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So, I am a little confused as to what I should enter in my fitbit where it asks "my goal is to burn more than X amount of calories".

My TDEE right now is 2149 and I am eating at 20% below that:

Level Lightly Active (exercise 1-3 days per week):
2149 - ( 2149 x .20) = 1720 cals



*I calculated this using another post on this site:
file:///C:/Users/deetzah/Desktop/TDEE/Fat2Fit%20MFP%20TDEE%20Advice.htm