TDEE refers to "Total Daily Energy Expenditure". In short, it refers to the daily calories (energy) your body burns on a day to day basis
Hence by calculating your TDEE aka Maintenance Calories, you will be able to identify the calories required to maintain your current weight, and to increase (or decrease) your caloric intake to build muscle (or burn fat).
TDEE Calculator

Maintainance Calories Calculator

Determine the amount of calories you need to maintain your current weight

Note: Do not use this calculator if you are under the age of 18. The results then may differ from reality.

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