The house edge is a key concept in understanding how casinos operate. It describes the built-in mathematical advantage that the house has over players in each game. This edge ensures that, over a very long period of time and across many bets, the casino makes a profit even though individual players can and do win.
House edge is usually expressed as a percentage. For example, if a game has a house edge of 3%, this means that, in theory, the casino expects to keep £3 out of every £100 wagered over the long run. The remaining 97% is returned to players as winnings, although not necessarily to the same individuals who staked the money.
House edge and RTP (Return to Player) are closely related. If a slot has an RTP of 96%, the corresponding house edge is 4%. Different games have different typical edges. Well-played blackjack in some rule sets can have a relatively low house edge, while certain side bets or less favourable table rules increase it.
The presence of a house edge does not mean you can never win. Short-term outcomes are driven by random chance and volatility, so it is entirely possible to hit big wins or jackpots. However, if you play long enough, the maths tends to move your overall results closer to the game’s underlying edge.
Understanding house edge can help frame gambling as entertainment rather than as a way to make consistent profit. Choosing games with a lower house edge may make your bankroll last longer, but it does not remove the risk. The best approach is to combine basic knowledge of the odds with sensible limits and a focus on enjoyment.
Whether you are spinning slots, trying table games or watching live game shows, remember that the numbers are always tilted slightly in favour of the house. Playing within a budget you can afford and taking regular breaks helps keep that reality in perspective.