Your Total Daily Energy Expenditure (TDEE) is an estimation of how many calories you burn each day when exercise and other activities are taken into account. It's a crucial number for anyone looking to manage their weight, as it tells you your 'maintenance' calorie level. Eating more than your TDEE will lead to weight gain, while eating less will result in weight loss. This calculator helps you find your TDEE by first calculating your BMR and then multiplying it by an activity factor.