If the upcard is a 2 – 35.30% chance of busting.Here are the odds of the dealer busting based on the dealer’s upcard: If the total of the cards in your hand or the dealer’s hand add up to more than 21, that is referred to as a bust. In the case of a dealer busting, everyone at the table that has not busted automatically wins their hand and their bet. The dealer also cannot go over 21 or they lose as well.