The house edge: why the casino always wins

European roulette comes with an RTP of 97.3%, and the remaining 2.7% is the house edge — the casino’s guaranteed profit. Different versions and bets give an RTP ranging from 92.1% (the basket bet in American roulette) to 98.65% (even money in French with La Partage and En Prison), but the casino never returns all the money staked as winnings.

How the house edge works

There isn’t a single simple bet in roulette with even a 50% chance of winning. Even-money bets (paying 1:1) win 48.6% of the time — the player loses slightly more often than they collect, and that’s what produces the 2.7% edge. The same principle applies everywhere: a column or dozen (paying 2:1) wins 32.4% of the time, where a “fair” bet with no loss to the player would be 33.3%.¹

Why combination bets don’t save you

Experienced players cover, say, the Voisins and Tiers sectors at once, blanketing most of the wheel to win on almost every spin. But a combination of several individual bets costs more, and its separate components still lose — so the net gain comes out modest.

The cost of a rare loss on an expensive combination bet, set against the regular but small wins, adds up to exactly the same standard house edge. You can’t beat the maths by covering the layout — more on this in the breakdown of bet types.

Tips for winning

RTP and the house edge only settle on their “headline” values over hundreds and thousands of spins, while short sessions are highly volatile. If you want to win:

• play in short sessions — high volatility can push you into a short-term profit;
• practise a stop-profit — lock in the result and walk away once your bankroll is up, say, by 30%;
• choose high-RTP variants — the leader here is French roulette with La Partage or En Prison (98.65%).

That said, no set of instructions guarantees a profit — that’s a mathematical property of the game, not pessimism.