{"id":49731,"date":"2017-10-03T16:54:00","date_gmt":"2017-10-03T16:54:00","guid":{"rendered":"https:\/\/www.scoresandstats.com\/?post_type=gambling-news&p=49731"},"modified":"2025-05-22T15:11:30","modified_gmt":"2025-05-22T19:11:30","slug":"how-do-betting-odds-work","status":"publish","type":"expert-betting-guide","link":"https:\/\/diego-sas.cpp10.com\/expert-betting-guide\/how-do-betting-odds-work\/","title":{"rendered":"How Do Betting Odds Work"},"content":{"rendered":"
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How Do Betting Odds Work<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h1>\n\n\n\n

Before you can start placing smart wagers, you need to understand how betting odds work. This includes how to read betting odds, and how to convert betting odds to probability.<\/p>\n\n\n\n

This article will start with some of the core concepts of betting odds as a refresher and will move into more advanced calculations that you can put into practice. By the end, you\u2019ll be able to use the implied probability, vig, and overround to identify which wagers are inflated, and which are worth betting on.
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<\/path><\/svg><\/span>How to Read Betting Odds<\/a><\/span><\/p>\n\n<\/div>\n\n

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<\/path><\/svg><\/span>How Bookies Make Money<\/a><\/span><\/p>\n\n<\/div>\n\n

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<\/path><\/svg><\/span>Convert Betting Odds to Probability<\/a><\/span><\/p>\n\n<\/div>\n\n

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<\/path><\/svg><\/span>Advanced Betting Odds Concepts<\/a><\/span><\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n

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How to Read Betting Odds<\/h2>\n\n\n\n

There are three main types of betting odds: American, Decimal, and Fractional. American odds tend to be US-centric, kind of like the Imperial System. Decimal odds are the common denomination in Europe and the rest of the betting world. <\/p>\n\n\n\n

Fractional odds tend to be used for racing, particularly horse or greyhound racing. Even in the US, fractional odds are still used at racetracks and racebooks. <\/p>\n\n\n

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American<\/strong><\/h3>\n\n\n\n

American odds, also known as moneyline odds, are the most common format in the United States. These odds are presented as either a positive or negative number. A negative number indicates the favorite and shows how much you need to wager to win $100. <\/p>\n\n\n\n

For example, if a team is listed at -150, you need to bet $150 to win $100. On the other hand, a positive number represents the underdog and indicates how much you can win on a $100 bet. If a team is listed at +200, a $100 bet will return $200 in profit.<\/p>\n\n<\/div>\n<\/div>\n\n

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Decimal<\/strong><\/h3>\n\n\n\n

Decimal odds are more common in Europe, Canada, and Australia. This format is straightforward, showing the total return for every $1 wagered. <\/p>\n\n\n\n

For instance, if the odds are 2.50, you\u2019ll receive $2.50 for every $1 you bet, which includes both your original stake and the profit. To determine your total payout, simply multiply your stake by the decimal odds. Decimal odds are intuitive because they directly show the potential return on investment.<\/p>\n\n<\/div>\n<\/div>\n\n

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Fractional<\/strong><\/h3>\n\n\n\n

Fractional odds are most often used in the UK and Ireland, particularly in horse racing. These odds are presented as fractions, such as 5\/1 (five-to-one) or 3\/2 (three-to-two). The number on the left (the numerator) represents the potential profit, while the number on the right (the denominator) is the stake. <\/p>\n\n\n\n

So, if you bet $2 at odds of 5\/1, you\u2019ll win $5 for every $1 wagered, resulting in a $10 return on a $2 bet. Fractional odds are slightly more complex to calculate but are deeply rooted in traditional betting culture.<\/p>\n\n<\/div>\n<\/div>\n\n\n

How Bookies Make Money<\/h2>\n\n\n\n

Bookmakers make money by setting odds that give them a built-in advantage, ensuring profitability regardless of the outcome of a sporting event. This advantage is crucial for maintaining a sustainable business in the world of sports betting. <\/p>\n\n\n\n

What is Vigorish?<\/h3>\n\n\n\n

Vigorish, often called “vig” or “juice,” is the fee bookmakers charge for accepting a bet. It\u2019s essentially the bookmaker’s cut or commission, designed to guarantee a profit over the long run. The vig is embedded in the odds and that is why the payout for a winning bet is slightly less than what it would be if the odds were truly even.<\/p>\n\n\n\n

For example, in a standard point spread bet, both sides might be listed at -110 odds. This means you have to bet $110 to win $100. The extra $10 represents the vigorish, ensuring that the bookmaker profits as long as the betting action is balanced. Even if the action isn’t perfectly balanced, the vigorish helps cushion any potential losses for the bookmaker.<\/p>\n\n\n\n

We\u2019ll talk more about calculating the vig later in the article, and we\u2019ll show you how you can use the vig percentage to make smarter wagers. <\/p>\n\n\n\n

How to Convert Betting Odds to Probability<\/h2>\n\n\n\n

Learning how to read odds is only the beginning of the funnel. As you become more advanced, you\u2019ll need to learn how to calculate probability using the betting odds provided by sportsbooks. <\/p>\n\n\n\n

But first, let\u2019s discuss the difference between actual probability and implied probability. <\/p>\n\n\n

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Actual Probability vs. Implied Probability<\/strong><\/h3>\n\n\n\n

Actual probability is usually determined by analyzing historical data, statistics, and other relevant factors<\/strong> that affect the outcome of an event. For instance, in sports, this might involve considering team performance, player statistics, weather conditions, and other variables.<\/p>\n\n\n\n

Implied probability is the probability derived from the betting odds offered by a bookmaker<\/strong>. It reflects the bookmaker’s estimation of an event\u2019s likelihood, adjusted to include their profit margin (or “vig”).<\/p>\n\n\n\n

It\u2019s much easier for sports bettors to calculate the implied probability of a wager because the sportsbook has already done half the work for you. The bookie will have calculated the actual probability of an event, likely using a complex algorithm fed by multiple datasets. The resulting odds were then tweaked to add the bookmaker\u2019s margin. If we do a little math, we can easily calculate the implied probability of an event, as well as the bookie\u2019s cut. <\/p>\n\n<\/div>\n<\/div>\n\n

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Calculating Implied Probability<\/strong><\/strong><\/h2>\n\n\n
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There are a few different formulas you can use to calculate the implied probability of a wager. Here\u2019s a look:<\/p>\n\n\n

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Positive American Odds:<\/strong><\/p>\n\n\n\n