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How to Use the Fractional to Decimal Odds Calculator. Using this converter is easy. Simply enter the fractional odds into the box that states Fractional Odds. Fractional odds look like 2-1 0r 13/5. Press convert and the decimal odds will be shown in the Decimal Odds Box.

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Calculator Use

Convert stated odds to a decimal value of probability and a percentage value of winning and losing. This calculator will convert 'odds for winning' an event or 'odds against winning' an event into percentage chances of both winning and losing.

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  1. This makes the odds of it happening 1.0 (50÷50). When probability rises from 0.5 to 1.0, odds rise from 1 to a number approaching infinity. As an example, if we have a probability of 0.8, that makes the odds 8/2, which we can reduce to 4/1, which equals 4.0. When the odds are very high, e.g. 1000/1, probability is close to 1.
  2. Or for example, if there are 8 equally likely individual outcomes, and 6 of them favor of an event, and 2 are against the event, then the odds for the occurrence of the event are '6 to 2', or '6/2' or simply 3. So, the odds can be any positive number, it does not have to be a number between 0 and 1. The expression that is used to compute the.
  3. To convert odds of less than 2.00, you minus 1 from the decimal and then times the answer by -100. So the calculation for decimal odds of 1.50 is: 1.50 – 1 = 0.5. 0.5 x -100 = -200. To convert American odds to decimals, you simply carry out the reverse calculations. So for positive odds, you divide by 100 and plus.

Be careful if you are using sports teams odds or betting odds. If you see that the Patriots super bowl odds are 9/2, that is most likely 'odds against' and should be entered in the calculator with 'Odds are: against winning.'

When playing a lottery or other games of chance be sure you understand the odds or probability that is reported by the game organizer. A 1 in 500 chance of winning, or probability of winning, is entered into this calculator as '1 to 500 Odds are for winning'. You may also see odds reported simply as chance of winning as 500:1. This most likely means '500 to 1 Odds are against winning' which is exactly the same as '1 to 500 Odds are for winning.'

From Probability To Odds Calculator

Probability Formulas:

This calculator will convert 'odds of winning' for an event into a probability percentage chance of success.

Odds, are given as (chances for success) : (chances against success) or vice versa.

If odds are stated as an A to B chance of winning then the probability of winning is given as PW = A / (A + B) while the probability of losing is given as PL = B / (A + B).

For example, you win a game if you pull an ace out of a full deck of 52 cards. Pulling any other card you lose. The chance of winning is 4 out of 52, while the chance against winning is 48 out of 52 (52-4=48). Entering A=4 and B=48 into the calculator as 4:48 odds are for winning you get

For 4 to 48 odds for winning;
Probability of:
Winning = (0.0769) or 7.6923%
Losing = (0.9231) or 92.3077%
'Odds for' winning: 1:12 (reduced from 4:48)
'Odds against' winning: 12:1 (reduced from 48:4)

Further Reading

When a coin is tossed, there lie two possible outcomes i.e head or tail. If two coins are flipped, it can be two heads, two tails, or a head and a tail. The number of possible outcomes gets greater with the increased number of coins. Most coins have probabilities that are nearly equal to 1/2. For instance, flipping an coin 6 times, there are 26, that is 64 coin toss possibility. Calculate the probability of flipping a coin toss sequence with this Coin Toss Probability Calculator.

When a coin is tossed, there lie two possible outcomes i.e head or tail. If two coins are flipped, it can be two heads, two tails, or a head and a tail. The number of possible outcomes gets greater with the increased number of coins. Most coins have probabilities that are nearly equal to 1/2. For instance, flipping an coin 6 times, there are 26, that is 64 coin toss possibility. Calculate the probability of flipping a coin toss sequence with this Coin Toss Probability Calculator.

This Coin toss probability calculator shows the probability of minimum and maximum possibilities of head and tail outcomes.

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