The Ratio Method in Poker
The ratio method is a classic way to determine whether a call is profitable. You convert your chance to hit into hand odds. Then you compare those odds with the pot odds.
If the pot odds are better than your hand odds, you make money with that call in the long run. You can also read the basis of this comparison on the page about pot odds and hand odds.
Many players use ratios because they are easy to compare. You can put pot odds of five to one next to hand odds of four to one. Then you immediately see whether the call is positive or negative.
That makes this method useful in live poker and fast online situations.
On this page, you get a clear process, one complete main example, and two extra practical situations. You also learn which mistakes often return when calculating ratios.
That way, you can apply the method correctly at the table right away.
The core of the ratio method
You start by counting your outs. Then you calculate your hand odds with this formula:
unseen cards minus outs / outs
On the flop, you usually work with 47 unseen cards. On the turn, you work with 46 unseen cards.
Do you want to train this step by step? Start with calculating outs.
Then you calculate the pot odds. This is the total pot after your opponent’s bet, divided by your call amount.
If pot odds are greater than hand odds, calling is theoretically good. If they are lower, folding is usually correct.
Step-by-step ratio calculation
- Count your outs.
- Calculate your hand odds: unseen cards minus outs / outs.
- Calculate your pot odds: total pot after the bet / your call.
- Compare both ratios and make your decision.
Round hand odds when you must decide quickly. An exact result of 4.2 to one can be rounded to about four to one at the table.
Use the exact value in close spots. A small difference can decide between a call and a fold.
Main example: flush draw
- Hand: A♠8♠
- Board: 2♠7♥J♠
- Pot: $80
- Opponent’s bet: $20
You have a flush draw with nine outs. After the flop, there are 47 unseen cards.
Your hand odds are:
47 minus 9 / 9 = 38 / 9 = 4.2 to one
So, on average, you miss your draw 4.2 times for every hit.
After the bet, the pot is $100. You must call $20.
Your pot odds are 100 to 20. That equals five to one.
Because five to one is better than 4.2 to one, calling is profitable here.
Extra examples
Example: open-ended straight draw
- Hand: 9♥8♣
- Board: 7♦6♠2♣
- Pot: $60
- Opponent’s bet: $20
You have eight outs.
Your hand odds are:
47 minus 8 / 8 = 39 / 8 = 4.9 to one
After the bet, the pot is $80. Your call is $20.
So, your pot odds are four to one.
Because four to one is lower than 4.9 to one, folding is the better choice here.
Example: gutshot
- Hand: J♣9♦
- Board: 8♥7♠2♦
- Pot: $90
- Opponent’s bet: $10
A gutshot has four outs.
Your hand odds are:
47 minus 4 / 4 = 10.8 to one
After the bet, the pot is $100. Your call is $10.
So, your pot odds are ten to one.
Because ten to one is slightly worse than 10.8 to one, folding is usually correct.
Ratio or percentage
Ratio and percentage lead to the same decision. Ratio is often faster if you are used to odds notation.
Percentage feels more intuitive for many players, especially if they think in chance values.
Choose the method you can use fastest and without mistakes. If you want to practice percentages, go to the percentage method.
If you are unsure between both methods, use ratio for the comparison. Then use percentage for a quick sanity check.
If both point in the same direction, you are usually right. In a marginal spot, a conservative fold is often the best line.
Common mistakes
Players often forget that pot odds use the pot after the opponent’s bet. If you accidentally calculate with the old pot, you make calls that are too loose.
So, always check the current pot size first.
Players also often count outs too optimistically. When a flush is possible on the board, not every suited out is clean.
Some cards give you a hand that still loses against a higher flush or full house.
Be strict when selecting outs. Also read the explanation about clean and dirty outs.
A third mistake is rounding too much in close spots. The difference between 4.9 to one and five to one looks small.
Still, that difference decides your play. Therefore, use the exact result with one decimal in marginal spots.
Frequently asked questions about the ratio method
unseen cards minus outs / outsOn the flop, you usually calculate with 47 unseen cards.
With nine outs, that gives you:
47 minus 9 / 9 = 4.2 to oneFinal thoughts
The ratio method is compact and strong for quick decisions with draws.
Once you recognize standard outs, you can make the comparison within seconds.
Practice with real hands. You will notice that your calls become more consistent and more profitable.