Your Total Daily Energy Expenditure (TDEE) is an estimation of how many calories you burn per day when exercise is taken into account.

It is calculated by first figuring out your Basal Metabolic Rate, then multiplying that value by an activity multiplier.

 This is the total number of calories (energy) you need each day to keep up with metabolic functions and activity including exercise, occupation, chasing kids, housework, hobbies, lifestyle, etc.

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Once you know your BMR and TDEE, all you need to do is make sure your caloric intake is less than that number! So if your TDEE ends up being 2,200 calories per day, you need to eat fewer calories to achieve "weight loss". ... Most dieticians recommend eating a deficit of anywhere between 500-1,000 calories a day