What casino mechanics actually imply — run it 100,000 times.
Pick a bankroll, a bet, and a betting system. We simulate tens of thousands of full sessions and show you the real distribution of outcomes — risk of ruin, variance, drawdowns and expected result. This is an educational transparency tool. It will not help you beat a casino, because the maths says you can't; it will show you exactly why.
Distribution of final bankroll
Where players actually ended up, across every simulated session. The dashed line is your starting bankroll.
Survival curve
Share of players still solvent as the session goes on.
Systems compared — same bankroll, same edge
No betting system changes the house edge. They only reshape how you lose.
| System | Risk of ruin | Median result | Avg result (EV) | Hit target |
|---|
The reality, in three lessons
The edge is fixed
Every even-money spin pays as if there were no zero, but the zero(s) mean the wheel keeps 2.70% (European) or 5.26% (American) of everything wagered, forever. Over a session you wager many times your bankroll — so the edge compounds against you.
Martingale trades many small wins for one ruin
Doubling after losses wins often — until a losing streak you couldn't cover wipes you out. It doesn't reduce long-run risk; it concentrates it into rare catastrophic losses. The distribution shows the fat left tail.
Past spins don't remember
A wheel has no memory: after ten reds, black is still 48.6%. Systems that "recover losses" assume the opposite. The simulation makes no such assumption — and neither does the wheel.
Not gambling advice. This tool models simple even-money bets to illustrate probability. Real games vary; the house edge is always against the player over time. If gambling stops being fun, support is available (e.g. BeGambleAware, GamCare).