The casino does not gamble. It charges.
Every casino game has a margin built into the rules: the house edge. It does not depend on your luck or your system — it is there on every spin. This tool tells you, in money, what you hand the casino over a typical session.
The idea
Why the house always wins.
European roulette has 37 numbers, but a red bet pays as if there were only 36. That gap — the zero — is the house edge: 2.70% of everything you stake, spin after spin. You can win one night, or ten. But the margin never gets tired: the longer you play, the closer your result drifts to the expected loss.
What the casino keeps
Pick the game and see what the math hands the casino, session after session.
A single zero. The standard roulette wheel in most casinos.
What you put down on average each round.
How many rounds you play in a typical sitting.
House edge
2.70%
Margin built into the rules
Amount wagered
1,000 €
The same money, bet and re-bet
-27.00 €
Of every 100 € that crosses the table, the casino keeps 2.70 € on average. In this session that is 27.00 € that do not come back.
A session like this every week, over a year
Playing this once a week costs around 1,404 € a year. It is not bad luck: it is the fixed price of the game.
The same, across every game