Odds to percentage sports betting

Fixed-odds betting is a form of wagering against odds offered by a bookmaker or an individual or on a bet exchange. It involves betting on an event in which there is no fluctuation on the payout. In Australia , the practice is usually known as "SP betting". It is customary with fixed-odds gambling to know the odds at the time of the placement of the wager the "live price" , but the category also includes wagers whose price is determined only when the race or game starts the " starting prices ".

In the more usual case of an imbalanced book, the bookmaker may have to pay out more winnings than what is staked or may earn more than mathematically expected. An imbalanced book may arise since there is no way for a bookmaker to know the true probabilities for the outcome of competitions left to human effort or to predict the bets that will be attracted from others by fixed odds compiled on the basis personal view and knowledge.

With the advent of Internet and bet exchange betting, the possibility of fixed-odds arbitrage actions and Dutch books against bookmakers and exchanges has expanded significantly. Betting exchanges in particular act like a stock exchange , allowing the odds to be set in the course of trading between individual bettors, usually leading to quoted odds that are reasonably close to the "true odds. In making a bet where the expected value is positive, one is said to be getting "the best of it".

However, if someone offered odds of 10 to 1 that a card chosen at random from a regular 52 card deck would be the ace of spades, one would be getting "the worst of it" because the chance is only 1 in 52 that the ace will be chosen. Player A wins if the dice add up to 12, of which there is only one possible case. Player B wins if the dice fall in any other combination, of which there are 35 possibilities. When making a bet in which one must put more at risk than one can win, one is laying the odds.

Rational bettors will do so only if the actual chances of an adverse outcome are low enough that the expected outcome even after deduction of taxes and any transaction costs is favorable to the person placing the bet. Laying odds is reflected in the colloquial expression "[I would] dollars to doughnuts " — with which the speaker is expressing a willingness to risk losing something of value in exchange for something worthless, because winning that bet is a certainty.

Bookmakers sell bets based on the odds of a specific outcome, but lay betting allows the bettor in some English-speaking countries, the "punter" to reverse roles with the bookmaker, using odds to sell the opposite outcome to the bookmaker. In this context, "lay" is used in the sense of "layman", i. Favoured by bookmakers in the United Kingdom and Ireland and common in horse racing , fractional odds quote the net total that will be paid out to the winning bettor relative to the stake.

The term "fractional odds" is something of a misnomer, especially when visually reinforced by using a slash as opposed to, e. This fraction may be derived by subtracting 1 from the reciprocal of the chances of winning; for any odds longer than "even money," this fraction will be an improper one. Not all fractional odds are traditionally read using the lowest common denominator.

Perhaps most unusual is that odds of are read as "one-hundred-to-thirty". Fractional odds are also known as British odds, UK odds, [5] or, in that country, traditional odds. Favoured in Continental Europe , Australia , New Zealand and Canada , decimal odds differ from fractional odds by taking into account that the bettor must first part with their stake to make a bet; the figure quoted, therefore, is the winning amount that would be paid out to the bettor.

It is considered to be ideal for parlay betting because the odds to be paid out are simply the product of the odds for each outcome wagered on. Decimal odds are also known as European odds , digital odds or continental odds and tend to be favoured by betting exchanges because they are the easiest to work with for trading, in this case the purchase and sale of upside and downside risk.

Moneyline odds are favoured by United States bookmakers and as such are sometimes called American Odds. Moneyline refers to odds on the straight-up outcome of a game with no consideration to a point spread. To convert fractional odds to decimal, take the fractional number, convert it to decimal by doing the division, and then add 1. For example, the 4-to-1 fractional odds shown above is the same as 5 in decimal odds, while 1-to-4 would be quoted as 1.

The yellow fields above are input cells. All you need to enter are the American odds of a bet either by using the slider or entering the value in the field and the bet amount. The betting odds calculator will work for all types of bets: point spread, moneyline, total, or props. For any bet that has a handicap value set ex: a point spread of -6, total of 43, etc. Related: Find sports betting calculators and more tools here. I have bolded the moneyline odds to make it obvious what we are looking for.

I have highlighted the actual odds you would enter for any of the given markets. Despite each example above representing a different bet, they all have odds that you can enter into the calculator. You can also check out our implied win probability to odds calculator if you want to take a win percentage and translate it to American or Decimal odds. Knowing the implied odds of a bet is extremely useful if you are doing your own modeling.

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One of the simplest examples to illustrate implied probability is a coin toss. We all understand the concept a flipping a coin. We can calculate the implied probability of any wager by dividing our stake with our potential payout. The math is obviously the same for both sides. Both sides come to the same calculation of 0.

We can multiply this decimal by 0. This is an extremely common bet that is offered at just about every sportsbook online. Typical sportsbooks odds may look something like this. When multiplied by , we get a percentage of If we add these percentages together, The 2. Implied probability is also synonymous with breakeven percentage. This is most common in boxing or mixed martial arts MMA contests.

The difference between the favorite and underdog here is quite large. This is often the case with boxing or MMA betting markets , as the sportsbook takes a much larger amount on the favorite compared to the underdog.

These two numbers added up equal To do this, we simply divide each percentage by Donald Trump: 4. The higher the total payout i. In both cases, you get your initial wager back, in addition to the amount won. The difference between the odds for the favorite and the underdog widens as the probability of winning for the favorite increases. In this matchup, there is a big difference between the two odds, indicating a much higher probability of Duke winning the game and advancing to the next round of the NCAA Tournament.

If you are planning to enter the betting or the gambling world, it is important to be able to understand and interpret all types of odds well. Trading Psychology. Business Essentials. Wealth Management. Your Money. Personal Finance. Your Practice. Popular Courses. Key Takeaways The three main types of betting odds are fractional British odds, decimal European odds, and American moneyline odds.

These are simply different ways of presenting the same thing, and hold no difference in terms of payouts. Compare Accounts. The offers that appear in this table are from partnerships from which Investopedia receives compensation. Related Articles. A Look at Casino Profitability. Partner Links.

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