BMR and TDEE Calculator
BMR stands for "Basal Metabolic Rate", and is equivalent to the number of calories you burn daily just by breathing/living. So, if you were to literally lay in bed all day like a zombie (aka..every Sunday for me), this is how many calories your body would burn.
TDEE stands for "Total Daily Energy Expenditure". It takes your BMR and multiplies it by the "Activity Factor" to show a more realistic number of how many calories your body is burning. Do not include any workouts you do daily, as it makes the calculator less accurate. Instead, calculate how much you burn off with your workouts separately, than add them on. See my links for good exercise calculators.