TDEE Activity Level

Hi

I'm sure MFP is overestimating how many calories my exercising burns (I currently set it at 'sedentary' and then log all exercise), so I'm looking to calculate my TDEE instead; however, from the websites I've checked I'm finding it hard to determine what my exercise level is. When it says exercise X number of hours or days per week, does this include walking?

What do you think I should set my level at if I'm doing the following:
desk job
walk 1-2 hours per day, every day
45mins-1hr fitness classes (aerobics/circuits) 3 times per week

....maybe light activity?

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