Blackjack Bankroll Lab: Risk of Ruin & EV per Hour
Is a game worth playing? Enter the rules, your bankroll, and a bet spread, and Bankroll Lab forecasts EV per hour, risk of ruin, N0 (the hands to overcome variance), and a realistic session range — all calibrated from billions of simulated Hi-Lo shoe rounds. Then practice the same setup in the free blackjack trainer and the Lab tracks your real results against the forecast with a luck delta and z-score.
Bankroll Lab forecast
What it tells you
- EV per hour — your expected win rate at the table for the rules and spread you enter.
- Risk of ruin — the chance you bust your bankroll before reaching long-term EV. Flagged when a spread is too big for your roll.
- N0 — the number of hands it takes for your edge to overcome variance, a measure of how soon the long run actually arrives.
- Session range — the realistic swing band for a session, so a losing stretch can be read as variance or a real problem with the spread.
Bankroll & risk FAQ
- What is risk of ruin in blackjack?
- The probability of busting your bankroll before reaching long-term EV. It depends on your edge, the variance of your spread, and how big your bankroll is relative to your bets. Bankroll Lab flags any setup above your chosen tolerance.
- How big a bankroll do I need to count cards?
- Enough to keep risk of ruin under 5% for the spread you intend to play. Enter your spread and table and Bankroll Lab inverts the math, telling you the bankroll size that fits — and warning when the spread is too big for your roll.
- How do bet spreads affect EV and risk?
- A wider spread raises EV per hour but also raises variance and risk of ruin, and the ramp shape matters more than the raw max bet. Bankroll Lab scores any spread against your bankroll so you can compare ramps and two-hand thresholds apples to apples.
- Where do the Bankroll Lab numbers come from?
- Bankroll Lab is backed by calibrated Hi-Lo shoe-game simulations. The current reference tables are built from more than 6 billion simulated blackjack rounds across supported shoe-rule combinations. For each forecast, the matching true-count edges and variances are combined with your bankroll, table, and spread to estimate EV per hour, risk of ruin, N0, and session range.
- Can I track real sessions and get live spread coaching?
- Yes. Tracked sessions record every round, bet, and count. When you're placing bets manually, the trainer flags overbets and underbets against the planned spread at the current true count; with Auto Bet on, it just places the planned bet for you. The recap then compares observed net to the spread's forecast net with a luck delta, z-score, and Discipline EV.
- What does the actual-vs-expected chart show?
- Your cumulative actual net plotted against expected net as the session unfolds. If actual tracks expected, the spread and play are paying as the math predicts; if it lags, the z-score and Discipline EV help separate variance from a real problem with the spread or your decisions.
Keep studying
Pair the bankroll math with the EV heatmap to see which hands make money, the interactive strategy chart for correct play, and the deviation chart for the count-based index plays.