Omaha Hi/Lo, eight or better, with four hole cards. Enter the hands and board, and see each hand's share of the pot, counting the high half and the low half.
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Worked examples
We computed these with the same engine as the calculator, by counting every possible deal. Hand A is the first hand in each spot. Equity is the share of the pot a hand takes on average if no one bets again; it isn't advice on how to play.
1. Aces with two and three against kings
Hand A holds a pair of aces plus a two and a three. Hand B holds big cards only.
Flop:4♠Four of spades5♥Five of hearts9♣Nine of clubs
Aces with two and three against kings: each hand's equity
Hand
Cards
Equity
Hand A
A♠Ace of spadesA♦Ace of diamonds2♣Two of clubs3♥Three of hearts
86.3%
Hand B
K♥King of heartsK♦King of diamondsQ♣Queen of clubsJ♥Jack of hearts
None of the three flop cards is an eight or lower, and only two cards are left to come, so nobody can make a low on this board. Hand A flopped a full house, kings full of nines.
Flop:9♣Nine of clubs9♦Nine of diamondsK♣King of clubs
A flop where no low is possible: each hand's equity
Hand
Cards
Equity
Hand A
K♠King of spadesK♦King of diamonds9♥Nine of hearts4♣Four of clubs
99.9%
Hand B
Q♥Queen of heartsQ♦Queen of diamondsJ♣Jack of clubs3♠Three of spades
Each player gets four hole cards and uses exactly two of them with exactly three board cards, for the high half and for the low half. The low half needs five different ranks, none higher than an eight, and an ace counts low. Straights and flushes don't hurt a low. If no hand makes a low, the best high hand takes the whole pot. A hand that wins both halves scoops.
There are 270,725 possible 4-card starting hands, and each one contains 6 two-card combinations you could choose to play. The calculator seats 10 players at most.
What the calculator does here. Flop and turn spots are usually exact. The results also show how often a qualifying low appears. Preflop is simulated.
Disclaimer
Poker equity calculator (educational). This tool shows each hand's equity: the share of the pot it would win on average if all the remaining cards were dealt with no more betting. It uses only the cards you enter and treats every unknown card as equally likely. It ignores betting and how anyone plays, and it cannot tell you what will happen in a hand or what to do. “Exact” results count every possible deal. “Simulated” results are estimates; the plus-or-minus figure means each player's true value is very likely (95% confidence) within that range. Nothing you enter leaves your device. Many card rooms and poker sites do not allow calculators during a hand; check their rules.