Enter two hands and, if you want, a board. The calculator plays the hand out and reports how often each side wins, loses and ties.
With one card to come it enumerates all 44 possibilities and the answer is exact. Earlier than that it simulates, which is accurate to roughly a tenth of a percent — enough to settle any argument at the table.
Suits are hearts, diamonds, spades, clubs. Ranks are 2–9, T, J, Q, K, A.
Equity counts ties as the half-pot they are worth, so a hand that never loses outright but chops half the time is not the same as one that wins outright half the time. Both sit near 50%, and only one of them is safe to get all-in with against a raise.
A pair against two overcards is close to a coin flip — 55/45 to the pair. A pair against one overcard is about 70/30. Two overcards against two undercards is about 63/37. Suited connectors gain about 3 points over their offsuit version, which is less than most people play them as if they had.
Ace-king against queens is 43% before the flop and either 90% or 5% after it. Running the numbers before the flop tells you whether to get the money in; running them afterwards mostly tells you what already happened.
With one card to come, yes — it counts every one of the 44 possible rivers. With more cards to come it simulates 40,000 hands, which is accurate to about a third of a percent.
Yes. Leave it empty and it deals them a random hand, which is what you want when working out how a holding performs against an unknown range.
Ties are counted as half a pot each and reported separately, because a chopped pot is not a win.