Common Poker Probabilities

Heads up matches (approximate)

Pair vs. two undercards 5:1
Pair vs. lower pair 4.5:1
Pair vs 1 over, 1 under 5:2
Pair vs two overcards 1.2:1
Pair vs matches higher of non pair 7:1
Pair vs matching lower 5:2
Dominated (e.g KJ vs J9) 5:2
1 or 2 over cards 5:3

Misc Odds of interest:

pair, flop a set 1:7.5
Suited, flop a flush draw 1:7.5
Connected flop straight draw 1:7.5
Connected, flop straight 1:76
Suited, flop a flush 1:118
Suited connector, flop draw to straight or flush 1:4
Suited connector, flop draw to straight or flush, or pair 1:1
no pair, flop a pair 1:2.3

Outs to odds (one card to come):

Outs Odds
1 45.0
2 22.0
3 14.3
4 10.5
5 8.2
6 6.7
7 5.6
8 4.8
9 4.1
10 3.6
11 3.2
12 2.8
13 2.5
14 2.3
15-17 ~2
18-20 ~1.5
> 20 ~ 1