At this point you may believe that calculating the odds in poker is too much for you. Luckily, there is a simpler method which is more than just useful. It is simply known as the rule of 2 and 4 and it has been used by many players for a long period of time.
Rule of 4 and 2 Poker
By calculating the odds you may have, you can decide should you fold, call or rise and should you continue playing. The rule in question is simple. All you have to do is to count your outs and then multiply the number with 2, for turn or 4 for river, if you want to reach those round. Of course, we will give you a few examples that may help you.
Your cards are 9 (diamond) and 10 (club). The flop reveals ace (heart), jack (spade) and 8 (diamond). Your opponent has 10 (heart) and ace (club). As such, he obviously has a pair. You have 8 outs (4 sevens and 4 queens). The formula states that:
For river: 8×4=32%
For turn: 8×2=16%
In this case you will have an ace and a king, both of hearts. The flop is 3 (club), 6 (diamond) and ace (spade). However, your opponent has 6. You will need a king in order to win. If you use the formula, you will multiply 3*4 and get 12%, which is low.
Your cards are 10 and a jack, both of hearts. The flop comes at a queen (heart), 9 (heart) and 2 (club). You have 15 outs, meaning that you have 30% to reach turn and 60% to reach the river round.
All you have to do is to use this simple rule. Count the outs and multiply them with 2, if you want to know odds for turn and with 4 for river. The number you get is percentage you will have to reach the round.