BMR and TDEE

I am trying to work this out and am getting various results;

BMR on Mifflin St Jeor is 1292
Harris is 1406

TDEE Calculated is 1688

I am utterly confused as to which one I should be sticking to?

I am looking at doing the 5 2 Fasting Plan and don't know what I should be eating on a normal day.

I am only looking for help in this thread so please no *****y, nasty comments.

As my gran would always say if you don't have anything nice to say then say nothing at all :)

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