When it comes to blackjack, the exact percentage of the house edge is hard to be defined due to the fact that the game has so many variants. Some of the rules which can differ from one variation to another include whether the dealer hits or stands on soft 17, whether doubling after splitting is permitted, whether late/early surrender is available and whether re-splitting aces is allowed. The rules of the respective game depend on the casino of your choice as well and even the slightest change in this aspect influences greatly the house edge.In general, the house edge most variations offer is less than 1%, providing that you apply a basic strategy. For instance, the house edge in the version Blackjack Switch is 0.17% and in Super Fun 21 is 0.94%. The number of decks also has an impact on this percentage. In this sense, the more packs of cards in use, the higher the house edge is. For example, single deck blackjack games increase the house edge with only 0.4%, whereas the eight deck variations – with 0. 70%.