Blackjack / Probability / Strategy
Expected value is the long-run average result, not a session prediction. Use this calculator to estimate edge, hourly EV, standard deviation, and bankroll risk from realistic inputs.
The estimate combines off-the-top rule cost with count advantage. It is a planning model, not a replacement for full blackjack simulation.
Blackjack payout, H17/S17, DAS, surrender, penetration, true count, average bet, and hands per hour drive most of the estimate.
Compare games and stake levels. If hourly EV looks good but risk of ruin is high, the unit is probably too large.
The live calculator estimates rules cost, effective edge, hourly EV, standard deviation, risk of ruin, max bet, N0, and a 20-hour EV range after JavaScript loads.
Use the calculator with realistic penetration, average bet, hands per hour, unit size, and bankroll. The output is a planning estimate, not a session prediction.
EV is expected value: the long-run average win or loss from a game, bet size, edge, and volume.
Blackjack results swing heavily around EV, so standard deviation helps size bankroll and expectations.