How to use it
Choose the game, press a card slot and pick its card from the deck; a card in play is greyed out everywhere else. Add up to six hands and up to five board cards. With a board out, the calculator counts every runout exactly. Before the flop it samples 100,000 boards with a fixed seed, so a shared link shows the same numbers.
A worked example
The page opens on the classic PLO all-in: aces and kings double-suited against jack-ten-nine-eight double-suited. The aces hold 61.5% before the flop, far from the 80% a big pair has in Hold'em. Put out a flop of 10♦ 9♠ 2♥ and the rundown is now ahead with 67.6%, holding two pair and a pile of straight draws. On K♦ 7♣ 2♠ the aces and kings climb to 77.9%.
Why Omaha equities run close
Each hand holds six two-card combinations in PLO, ten in PLO5 and fifteen in PLO6, so every player has more ways to connect with the board. Big favorites are rare: a published figure puts aces with any two other cards at about 65% against a random hand. The exactly-two rule catches new players out: four hearts on the board and one heart in your hand make no flush. For the split-pot games, see the Big O and PLO8 calculator; for Hold'em, the poker odds calculator.