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Old 10-31-2010, 05:48 PM   #1
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How to turn percentage into ratio

This is basic question and I wasn't bad at maths but I would like to hear answer from experience players ( it can be also useful for other players ). So if I use rule x4 on turn and x2 on river to get percentage how to turn that in ratio? For example when I wait for flush on turn it's 9x4=36 per cent so how now to make ratio from that?
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Old 10-31-2010, 06:27 PM   #2
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Re: How to turn percentage into ratio

eyeball it.
1:2 is 33/66 so that's pretty close.
Just convert the numbers so they add up to 100

or here's some help:

1:1 = 50/50
2:1 = 66/33
3:1 = 75/25
4:1 = 80/20

you really shouldn't need too many more. The gap keeps decreasing anyway. 9:1 and 10:1 are basically equivalent (90/10 and 91/9).
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Old 10-31-2010, 06:38 PM   #3
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Re: How to turn percentage into ratio

Don't use percentages.
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Old 10-31-2010, 09:29 PM   #4
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Re: How to turn percentage into ratio

Here is the exact way. Then you can go from there to approximate.

If you have a win percentage, say 40%, you subtract from 100% to get the lose percentage. In this case 100% - 40% = 60%. Then you take the ratio of lose percentage to win percentage. In this example it is

Odds = 60/40 to 1 or 6/4 to 1 or 3/2 to 1 or 1.5 to 1 or 3 to 2 (you can multiply both numbers by the same number, in this case we multiplied 1.5 and 1 by 2)

In general, odds = Probability you lose / Probability you win to 1, where

Probability you lose = 1 Probability you win


The suggestion not to use percentages is not very helpful in my opinion. You can add and multiply probabilities (percentages) to derive win/lose chances for many cases. You cannot do this directly and easily with odds numbers.

For example, the odds of getting kings is 220 to 1; same for aces. What are the odds of getting kings or aces? With percentages, I know the chances are 1/221 + 1/221 = 2/221 which I can then convert to odds if I want. I don't know how to work from odds directly in an easy manner.
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Old 10-31-2010, 09:39 PM   #5
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Re: How to turn percentage into ratio

Percent = per hundred. So to quickly figure the ratio, take the number of times the percentage number goes into 100, then subtract 1 (because you "have" that one) and express that number as a ratio to 1 (the one that you have).

For example, say you do your 4x rule on the flop and figure you have approx 24% chance of hitting one of your supposed 6 outs. Let's just round it to 25% to be easier. 25 goes into 100 4 times. Minus one. That's 3:1.

But after a while you won't really do the math because you just memorize the common ones or the milestone fractions and percentages. 33%= 2:1. 10%=9:1. 20%=4:1. 50%=1:1. And then you just adjust a little up or down for the figures in between. So at 18% you're breaking even if the pot is offering you a little more than 4:1.

If you want to be more exact, just find or make a chart with the exact ratios or each number of outs (a lot of poker books have these). But you really only need to memorize the ones in the middle, because you're hardly ever going to fold if you have 10+ outs, and hardly ever going to call if you have less than 5 (pair with a draw to improve to 2 pair+).
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Old 10-31-2010, 11:33 PM   #6
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Re: How to turn percentage into ratio

Grunch.

Divide 100 by that percentage. Call that result n.

Your odds are 1: (n-1)

So, for example, if you have a 10-outer with one street to come, you're roughly a 20% dog so:

100 / 20 = 5

Odds: 1: (5-1) or 1:4

This is verifiable since there are five trials (1+4) and you win one of those five (20%).

Maybe you've got four outs with one street left to come so applying the rule of 2, you'd get 8 so:

100 / 8 = ~12

Odds: 1: (12-1) or 1:11

Last example, nine-outer with two streets left to come so 36%. Now:

100 / 36 = ~3

Odds: 1: (3-1) or 1:2

glgl!

Last edited by quux; 10-31-2010 at 11:34 PM. Reason: stupid math error.
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Old 11-01-2010, 09:22 AM   #7
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Re: How to turn percentage into ratio

thank you people, this was useful...
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