Bankroll & Variance Simulator
Expected value only tells you the average. This simulator shows the truth around it: how wide the swings are, how many players go bust, and how few stay in profit long-term.
Bankroll & Variance Simulator
What actually happens if you play 500 rounds of roulette? This Monte Carlo simulation runs 1,000 players through your scenario at once and shows the full distribution — not just the expected value.
Why variance matters more than RTP
A 96% RTP slot sounds fair. Reality: over 100 spins your result can sit anywhere between −80% and +500%. Only after tens of thousands of spins does your average converge toward the RTP — until then, variance rules.
What is Monte Carlo?
A Monte Carlo simulation rolls many random trajectories and shows the distribution. Instead of asking 'will I lose?' it asks 'what percentage of players lose how much?' — an honest answer instead of a soothing average.
What to take away
If after 500 roulette rounds most players are down and 5–15% are completely broke, that's not bad luck — it's maths. Play deliberately, with limits, and treat expected loss as the price of admission.