Originally Posted by Wohali
The Net Calories is too an extent how many calories left you can eat before you are at the estimated required amount for your age/size/gender. However, if you are trying to lose weight you want to keep the Net Calories at a minus number. Everyone is different depending on their needs & goals, but I think many keep it at -500 to -800 calories as theoretically you need to have that much deficit per day in order to lose an average of 2 lbs per week which is supposedly the safe level.
500 per day will get you, on average, a pound loss per week. For two pounds, you need a deficit of 1000 per day, or average of that.