TDEE is your "Total Daily Energy Intake," and represents the amount of calories you burn on any given day. This varies based on your height, weight, gender, age, and physical activity.

MET values represent how many calories are burned while doing different things. For example, sitting on a couch staring at this screen has a MET score of 1.0 and burns about 55 calories an hour, while running like an Olympic athlete has a MET score of 23.0, and burns about 1650 calories an hour.