Poker odds, answered
KK vs 87s odds: pocket kings against eight-seven suited
Pocket kings (K♥ K♦) win 77.2% of the time against eight-seven suited (8♠ 7♠), lose 22.5% and tie 0.3%, all in before the flop. Equity: 77.4% to 22.6%.
Counted exactly over all 1,712,304 boards, not simulated. Equity counts a tie as half a win.
Why KK is the favourite
Suited connectors against a big pair: eight-seven suited needs two pair, trips, a straight or a flush, and it has many ways to get them, which is why it wins about one time in five despite being far behind. Most of its wins come from straights and flushes.
What it means for a call
An all-in call is right when your share of the pot is at least the price. With 22.6% equity, eight-seven suited needs the pot to offer at least 3.4 to 1 to call against exactly pocket kings. In real hands nobody shows their cards: compare your equity against the whole range of hands that would bet this way, in the equity calculator or the preflop odds chart.
Suits change the numbers by a point or two: shared suits take flushes away from one hand. These are the suits shown above.