Calculate your expected loss and result probability ranges for a roulette session. Understand the impact of variance on short-term results.
Expected Loss
$8.10
4.1% of bankroll
P(Any Profit)
41.7%
Session Std Dev
$38.68
P(Lose All)
100.00%
Amount you're bringing to the table
Typical bet per spin
25-40 typical for live tables
Session length
Determines house edge
Affects variance (not house edge)
Best 5% case: Up $68 | Worst 5% case: Down $84
Monte Carlo simulation with 1,000 iterations
Your initial capital
Your expected advantage
Percentage of bankroll per bet
Total bets to simulate
Your expected loss equals total bets × house edge. For example, betting $10 per spin for 100 spins on European roulette ($1,000 total action), your expected loss is $27 (2.7%). Actual results will vary widely due to variance.
European roulette has a 2.70% house edge (single zero). American roulette has 5.26% (double zero). French roulette with La Partage has just 1.35% on even-money bets. Always prefer European or French when available.
This depends on your bankroll size relative to bet size and session length. With 40 betting units and even-money bets, the risk of losing everything in a typical session is low (usually under 5%). This calculator shows your specific risk.
Straight-up bets pay 35:1 but win only 1 in 37 spins. This creates huge swings - you can lose many bets in a row then win big. Even-money bets are more stable with nearly 50% win rate and 1:1 payout.
Quick-start with common scenarios
Expected Loss
$8.10
4.1% of bankroll
P(Any Profit)
41.7%
Session Std Dev
$38.68
P(Lose All)
100.00%