Strength Training

I strength train 3x's a week with a PT. I also walk. When I enter my exercise, the strength training calories burned do not show up, only cardio and that isn't very accurate either. So my question is how do I accurately calculate? I plugged in that I want to lose 2 lbs a week. It gave me a 1200 calorie amount also..what is TDEE? Thx,

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