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What Are Betting Odds
Betting odds are a fundamental part of sports wagering — they show you two key things: how likely an event is to happen and how much money you can win if your bet is successful.
In simple terms, odds reflect the bookmaker’s view of probability. A lower number means the outcome is more likely but offers a smaller payout. A higher number means it’s less likely, but the reward is greater. For example, odds of 1.50 suggest a favorite with a high chance of winning, while odds of 4.00 point to an underdog with a lower chance but a bigger potential return.
Odds also help you calculate your potential winnings. The exact formula depends on the format — decimal, fractional, or American — but the idea is always the same: multiply your stake by the odds to estimate your payout.
Sports Betting Odds Explained
Sports betting odds display the chances of an outcome happening in a sporting event. The odds determine how much you stand to win after betting a certain amount. The more you stand to win, the less likely the event is to happen. For example, if odds show that you’ll earn $170 from a $10 wager on the Denver Broncos beating the Washington Commanders, it suggests there’s a low chance of this occurring.
However, there is a difference between the odds of something actually happening (the true odds) and the odds given by sportsbooks (the implied odds).
True Odds vs. Implied Odds
True odds represent the actual statistical probability of an event occurring, with no adjustments for bookmaker profit. They reflect a fair, mathematically accurate picture of the outcome’s chances — in other words, what the odds should be in a perfectly even market.
Implied odds, on the other hand, are what sportsbooks actually offer. These odds still represent the chance of an event happening, but they include the bookmaker’s margin (often called the juice or vig). This ensures that the sportsbook maintains a profit edge regardless of the outcome.
Example of True vs. Implied Odds
Imagine a coin toss at the Super Bowl. The true probability of landing heads is 50%, or +100 odds. But a sportsbook might offer you -105 instead — meaning you need to bet $105 to win $100. That small difference is the vig.
So while true odds reflect a break-even point for both sides, implied odds tilt the numbers slightly in favor of the bookmaker.
How To Read Betting Odds
Learning how to read betting odds takes some time, but all bettors eventually find the type of odds that work best for them.
Being able to read odds in sports betting means you can quickly spot which teams are favorites and underdogs for events. You’ll also know which outcomes are worth betting on, and where sportsbooks might have made an error that you can exploit. This is crucial for understanding where to find betting value.
Sportsbooks including BetUS, MyBookie and Bovada allow players to choose which odd types are displayed on the sites. There are three common categories of odds: American, fractional, and decimal. Below is a breakdown of how each type works:
American Odds
American odds show the amount you’d win after betting $100 on an outcome. They work like an index, whereby the higher the odds, the less likely your bet is to win (and the bigger your profits if it does win).
The odds are displayed in either a positive (+) or negative (–) format. Positive odds show winnings from a $100 bet. Meanwhile, negative odds show the wager amount needed in order to win $100.
Here are examples of how American odds work:
| SPORT | ODDS | STAKE | WINNING OUTCOME |
|---|---|---|---|
| NFL | +300 on Ravens to beat Colts | $100 | $300 profit + $100 stake = $400 |
| MLB | +175 on Padres 1.5 run line vs Braves | $10 | $17.50 profit + $10 stake = $27.50 |
| NBA | -200 on Heat to beat Knicks | $200 | $100 profit + $200 stake = $300 |
| NHL | -300 on Maple Leafs to beat Oilers | $50 | $150 profit + $50 stake = $200 |
Decimal Odds
Decimal odds show the total return from a $1 bet. The higher the number, the more you win, but your wager comes with more risk. The smaller the odds, the more likely the bet is to win, but will come with less profit.
Your total return is stake + profit, which means decimal odds of 2.00 have a 50% chance of winning. Any higher, and the chances of you winning are less than even. Any lower and your chances of winning begin to increase.
Here are examples of how decimal odds work:
| SPORT | ODDS | STAKE | WINNING OUTCOME |
|---|---|---|---|
| NFL | 4.00 on Ravens to beat Colts | $100 | $300 profit + $100 stake = $400 |
| MLB | 1.75 on Orioles 1.5 run line vs Yankees | $10 | $7.50 profit + $10 stake = $17.50 |
| NBA | 1.50 on Heat to beat Knicks | $200 | $100 profit + $200 stake = $300 |
| NHL | 1.33 on Maple Leafs to beat Oilers | $50 | $150 profit + $50 stake = $200 |
Fractional Odds
Fractional odds are the most complicated odds you can find in a sportsbook. These odds are not easy to calculate unless you’re proficient in fractions.
The aim of fractional odds is to show how much profit you’ll make off a stake. The figure on the left of the “/” is your potential profit, and the figure on the right is your stake.
Here’s an example from horse racing:
-
Example One: You bet $1 on a horse to win a race at odds of 3/1. It wins, so you win $3 profit + your $1 stake. Unfortunately, this is as simple as fractional odds get. Here’s what happens when a horse has a better than 50% chance of winning:
-
Example Two: You bet $1 on the horse at odds of 1/3. It wins, so you win 33¢ profit + your $1 stake. Just like with negative American odds of –300, you’d need to wager $3 just to make a $1 profit. This is where the term odds on comes from.
What happens, then, when you see a price such as 5/2 or 15/8? The odds work the same and you simply divide the left figure by the right figure. A $1 bet at 5/2 earns you $2.50 profit. A $1 bet at 15/8 earns you $1.87 profit.
Here are some examples of fractional odds in action:
| SPORT | ODDS | STAKE | WINNING OUTCOME |
|---|---|---|---|
| NFL | 3/1 on Ravens to beat Colts | $100 | $300 profit + $100 stake = $400 |
| MLB | 8/11 on Orioles 1.5 run line vs Yankees | $10 | $7.30 profit + $10 stake = $17.50 |
| NBA | 1/2 on Heat to beat Knicks | $200 | $100 profit + $200 stake = $300 |
| NHL | 1/3 on Maple Leafs to beat Oilers | $50 | $150 profit + $50 stake = $200 |
Implied Probability
Implied Probability shows the probability of an outcome based on the odds provided by the sportsbook. Unlike true odds, they include the bookmaker’s margin — meaning the sportsbook has built in its profit, often referred to as the “vig” or “juice.”
In other words, implied odds help you understand what the bookmaker thinks the chances are, once you factor in their edge. This is especially useful if you’re looking to spot value bets — when you believe the true probability of an outcome is higher than the implied one.
To calculate Implied Probability:
| TYPE | ODDS FORMAT | IMPLIED PROBABILITY (%) |
|---|---|---|
| American | +150 | 100 / (150 + 100) = 40% |
| American | -200 | 200 / (200 + 100) = 66.67% |
| Decimal | 2.50 | 1 / 2.50 × 100 = 40% |
| Decimal | 1.50 | 1 / 1.50 × 100 = 66.67% |
| Fractional | 3/2 | 2 / (3 + 2) = 40% |
| Fractional | 1/2 | 2 / (1 + 2) = 66.67% |
Sports Betting Odds Calculator
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How to Use Odds Calculator
There are a lot of fields in the odds calculator that may seem intimidating at first. Here’s a quick rundown of what each field means:
American Odds
Also known as US or moneyline odds, American odds are based on a $100 wager and display as either positive (+) or negative (–) numbers. Positive numbers show how much profit you would make on a $100 bet, while negative numbers show how much you would need to bet to make a $100 profit.
Decimal Odds
As the name suggests, decimal numbers represent decimal odds. Commonly known as European odds, decimal odds represent the total payout for each bet. For example, odds of 2.50 mean you get $250 for every $100 wager. This format is popular across Europe and around the world.
Fractional Odds
Fractional odds display the profit relative to the wager. For example, odds of 5/1 mean you win $500 for every $100 bet. Fractional odds are typically used in the UK.
Implied Odds
This field is useful for converting odds into probability. The implied odds calculator takes odds and displays them as a percentage. For example, odds of +150 imply that your bet has a 40% chance of success.
Bet Amount ($)
This is where you enter the size of your bet. While the display is in dollars, you can think of it as any currency or unit.
To Win ($): Your winnings show up in this field. This is the overall profit of your bet, which is the amount of money you will earn minus your original wager.
Payouts ($)
The bet payout calculator displays the total amount of money you’ll have after your wager wins. This includes both the original bet amount and your winnings.
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