Even Money (Blackjack)

Even money in blackjack is an offer made in one specific situation: you hold a natural (21 on your first two cards) and the dealer's up card is an ace. Before checking whether the dealer also has blackjack, the casino offers to pay you an immediate 1:1 (even money) on your bet, guaranteeing a win and removing the risk that the dealer's hidden card completes a blackjack and pushes your hand. It is, in effect, insurance taken on your own natural, and like insurance it is a negative-expectation bet. Taking it feels safe but costs money over time. The maths: with a fresh shoe, the dealer's down card is a ten-value (completing blackjack and forcing a push on your natural) roughly 30.8% of the time, so about 69.2% of the time the dealer does not have blackjack and your natural pays the full 3:2. Worked example on a £100 natural: if you take even money you collect £100 profit, guaranteed. If you decline, then about 69.2% of the time you are paid 3:2 for £150 profit, and about 30.8% of the time the dealer also has blackjack and the hand pushes for £0. The expected value of declining is 0.692 × £150 + 0.308 × £0 ≈ £103.80 — more than the certain £100 from taking even money. Declining wins you about £3.80 more per £100 on average, which is why it is the mathematically correct play. Why it matters: even money trades a small guaranteed sum for a larger expected one, exactly the trade-off insurance always offers — and always loses over time. Common mistake: taking even money for the comfort of a sure win. Unless you are counting cards and know the shoe is ten-rich, decline it. Compare to: Blackjack, Basic Strategy.