A poker calculator evaluates the strength of a 5-card hand according to poker hand rankings, or calculates the probability of winning against other possible hands. Hand strength is deterministic — a royal flush always beats a full house.
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Pro Tip
In Texas Hold'em, the rule of 2 and 4: count your outs (cards that complete your hand). After the flop with 2 cards to come: outs × 4 ≈ probability %. After the turn: outs × 2 ≈ probability %.
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Did You Know?
There are 2,598,960 possible 5-card hands from a standard deck (C(52,5)). A royal flush occurs about once every 649,740 deals. If you played 100 hands per hour, you'd see one roughly every 90 years.
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