Casino War is the simplest game in the casino — until you hit a Tie. Then you face a critical mathematical decision: Surrender (lose half your bet) or Go to War (double your risk for a chance to win it back)?
This calculator analyzes the Expected Value (EV) of both options in real dollar terms, lets you simulate a full session, and exposes exactly why the optional “Tie Bet” is a mathematical trap. Enter your bet size, number of decks, and casino rules to get precise results.
Casino War Strategy Calculator
EV analysis · Session simulator · Tie Bet break-even
| Metric | Surrender | Go to War | Tie Bet |
|---|
The Tie Bet pays if your card equals the dealer's card on the initial deal. At what payout does the Tie Bet become +EV? Enter the number of decks your casino uses.
The Math: Surrender vs. War
Most players are scared to “Go to War” because they have to put up a second bet. The math, however, proves this fear is costly — and the calculator above quantifies exactly how much it costs you per decision.
When a Tie occurs, you have two options:
- Surrender: You forfeit 50% of your ante immediately. The effective House Edge on the Tie decision is 50% of the half-bet at risk. Across all hands (where Ties occur ~7.4% of the time with 6 decks), this translates to a per-hand House Edge of roughly 3.7%.
- Go to War: You post a raise equal to your ante. The dealer also posts a matching raise (which is burned). You then receive a new card each. If your card beats the dealer’s, you win 1:1 on the raise only — the ante pushes. If you lose, you forfeit both the ante and raise. House Edge on the War decision (on total capital at risk) is approximately 2.88% with 6 decks — significantly better than surrendering.
Conclusion: Always Go to War. The House Edge on surrendering (50% of the half-bet) is mathematically worse than fighting. Surrendering feels safer because you lose less immediately, but it bleeds your bankroll faster over any meaningful number of hands.
How Deck Count Affects the Math
The number of decks in play has a measurable effect on tie probability and therefore on all EV calculations. With a single deck, ties are less likely (fewer duplicate cards remain after each deal). With 6 or 8 decks, ties occur more frequently — approximately 7.4% of hands. The calculator accounts for this automatically when you select your deck count.
The Re-Tie Bonus Rule
Many casinos offer a bonus payout (typically 1:1 on the raise) if you tie again during War. This rule meaningfully improves the EV of going to War. Always check whether your casino offers this — and toggle it in the calculator above to see the exact impact on your numbers.
Understanding the Session Simulator
The Session Simulator tab runs a full Monte Carlo-style hand-by-hand simulation, comparing two strategies over the same sequence of rounds:
- Go to War strategy: Player always fights on Ties.
- Surrender strategy: Player always surrenders on Ties.
Both lines start from the same bankroll. The graph shows how variance and House Edge interact across 50–500 rounds. Note that short sessions can produce misleading results — the mathematical advantage of going to War becomes more visible over hundreds of hands. Reload the simulation to see a new random run.
This is an interesting perspective on the topic. I appreciate the detailed explanation and examples provided.