The hotel can advertise a much cheaper room rate without giving you the full picture. Obviously, seeing the room rate before the resort fee is added looks a lot less expensive, and that, in fact, is the whole point of a resort fee from the hotel’s point of view. Note: You’ll also need to add 13% tax to the whole thing to get your full and complete daily room rate. So, in other words: Room Rate + Resort Fee = Real Room Cost Room Rate $50 $39 $89 + tax How to properly calculate nightly Las Vegas room rates. So your actual daily Las Vegas room cost might look something like this: Advertised