4 more cards
Omaha hi-lo equity calculator
Exact split-pot equity for O8, Big O and Big O6, with scoop and quarter rates.
4 more cards
Flop Turn River
Pick cards to see live equity
Half of every Omaha hi-lo pot goes to the best qualifying low: five distinct ranks, all 8 or lower, aces counting low, straights and flushes ignored. This calculator computes exact split-pot equity for O8 (also written PLO8), Big O and 6-card Omaha hi-lo (8 or better), also written 6-card PLO8, for 2 to 6 hands plus an optional board and dead cards. On the flop, turn and river it enumerates every remaining runout; preflop it enumerates exactly when roughly 120,000 boards or fewer remain, and otherwise runs Monte Carlo until every hand's pot share converges to a ±0.3% target. Beyond total pot share it reports how often each hand scoops, wins only the high or low half, or gets quartered - the numbers that decide whether a raggy A-2 is a raise or a fold.
Omaha Hi-Lo Calculator FAQ
How it works
Pick a game (O8, Big O or Big O6) in the game selector, enter 2 to 6 hands, and optionally add a board and dead cards. Results stream live: total pot share per hand plus a split breakdown with scoop, hi-side, lo-side, both-sides and quartered rates, and how often a low is possible on the remaining runouts. Exact on the flop, turn and river; preflop exact when few enough runouts remain, Monte Carlo to a ±0.3% target otherwise. Share any spot with a link.
What is Big O poker?
Big O is 5-card Omaha hi-lo, played 8-or-better for low: five hole cards, and you must use exactly two of them for the high hand and (separately) exactly two for the low. It is mostly a live game - the WSOP's $1,500 Big O event has drawn fields over 1,400 entries three years running - and it plays looser than O8 because ten two-card combos per hand mean far more players connect with every board. Pick Big O in the game selector to run any matchup.
When does a low qualify in O8 and Big O?
A low needs five distinct ranks, all 8 or lower, built from exactly two hole cards and three board cards - so the board itself must carry three distinct ranks 8 or lower, or no low is possible at all. Aces play low, straights and flushes are ignored, and lows compare from the top card down: 8-7-6-2-A loses to 8-6-5-4-3, and the wheel (5-4-3-2-A) is the nut low. The calculator shows how often a low is possible on the remaining runouts and how often one actually gets made.
What does getting quartered mean?
Winning only a tied half. The classic spot: heads-up, you and your opponent both hold A-2 for the same nut low, and they win the high. They collect the full high half plus half the low half - 75% of the pot - while you collect 25%. You put in half the money and got back a quarter, so your 'winning' low hand lost money. The Quartered column counts exactly these runouts; a bare A-2 with no high potential gets quartered constantly in multiway pots.
What is a scoop?
Taking the whole pot: winning both halves, or winning the high when no low qualifies. Hi-lo profit is concentrated in scoops - split pots mostly hand you back your own money minus rake, so a hand that scoops 30% of the time earns far more than one that wins a half 60% of the time. That is why A-2 with high potential (suited ace, connected wheel cards) beats bare low hands, and why Scoop is the first column to read in the breakdown.
Why do the pot shares sum to 100% when pots get split?
Total pot share is an average of pot fractions: every runout distributes the whole pot (halves, quarters and all), so the shares across hands always add to exactly 100%. The Scoop, hi-side, lo-side, both-sides and Quartered columns are event frequencies instead - the share of runouts where that event happens. Hi side and lo side count won-or-tied halves, so one hand can appear in both on the same runout (Both sides is that overlap), and a tie puts two hands' numbers up at once. Frequencies overlap; money doesn't.
Are the results exact or simulated?
Exact on the flop, turn and river - every runout is counted, so quarter shares come out as exact fractions like 25.0%, and the status line shows a '✓ exact' badge. Preflop is also exact when roughly 120,000 boards or fewer remain to deal: six-way O8, five-way Big O and four-way Big O6 all qualify. Bigger preflop spots run Monte Carlo until every hand's pot share converges to a ±0.3% target, with the running margin shown while it streams.
Can I run a hand against a range?
Not on this page - here you enter specific hands. For ranges, the range calculator at /range-calc runs O8 and Big O range-vs-range, with total pot share plus wins-hi, wins-lo and scoop rates for every range. It has no 6-card hi-lo table yet, so for Big O6 test your hand against three representative holdings instead: a nut-low hand with high cards, a bare low, and a high-only rundown. That brackets what a real range does to your pot share.
Where are the Big O and O8 starting hand rankings?
At /big-o-starting-hand-rankings, which ranks all 16,432 four-card O8 hand classes and 134,459 five-card Big O classes by hi-lo equity. The short version: wheel cards with an ace dominate, and hi-only strength falls off a cliff - PLO4's best hand, A-A-T-T double-suited, ranks just 798th in O8. Look a hand up there, then bring it here to test the exact matchup.
What changes from 4-card to 5-card to 6-card hi-lo?
Each extra hole card multiplies your two-card combinations: 6 in O8, 10 in Big O, 15 with six cards. More combos means more hands connect with every board, so equities compress, the nut low gets made (and tied) more often, and quartering risk climbs. Hand values shift with it - Big O's best hand is A-A-5-4-2 double-suited, built to scoop both ways, while PLO5's hi-only best hand, A-A-T-9-9, ranks only 46,387th of 134,459 Big O classes. The weaker your low, the faster it turns into a liability as cards are added.