Betting Odds Converter
Type any World Cup bet in one format, like decimal, American, or fractional, and see the same odds in all 4 formats right away.Now you can quickly compare your sportsbook's odds with a prediction market and spot where the better bet is.
18+ only. Gamble responsibly. If betting stops being fun, see our responsible gambling page.
Example: 6.00
Type 5/1 or just 5
Example: 16.7
Example: +500 or -200
Type in any field and the other 3 update. Active field: decimal.
Worked example
Take Brazil, the longest shot in our top 12.
Their 0% chance is Infinity in decimal, 0/1 in fractional, and 0 in American odds.
Put $100 on Brazil and you get back $∞ if they win.
That is $∞ in profit (the money you win on top of your stake).
Why convert betting odds?
There are 3 real reasons to turn one number into another.
First, different sportsbooks and different countries show the same bet in different formats, so converting lets you put 2 prices side by side and see which one pays more.
Second, turning a sportsbook's price into a percentage lets you compare it against a prediction market like Polymarket or Kalshi (a site where people bet on what they think will happen), because a prediction market already shows its price as a percentage.
Third, when the sportsbook and the crowd disagree, that gap can be a good opportunity, a price that pays more than the crowd thinks it is worth.
The 4 odds formats explained
Decimal (European)
The total you get back for every $1 you stake (your stake is the money you put on the bet). At 6.00, a $1 stake returns $6: your $1 back plus $5 profit.
Fractional (English)
Your profit on its own, written as a/b. 5/1 means you win $5 profit for every $1 you stake. That is the same bet as 6.00 decimal, just written another way.
Implied probability
The same odds shown as a chance to win, the way a prediction market like Polymarket or Kalshi shows it (a site where people bet on what they think will happen). 6.00 decimal is a 16.7% chance to win.
American (moneyline)
The format US sportsbooks use, so most American readers see this one. A plus number is your profit on a $100 bet; a minus number is how much you stake to win $100. +500 means a $100 bet wins $500 profit; -200 means you bet $200 to win $100. It is the same bet as 6.00 in decimal.
Where is each odds format used, and how do you read it?
| Format | Where it is used |
|---|---|
| American (moneyline) | US sportsbooks |
| Fractional (English) | UK and Ireland |
| Decimal (European) | Most of Europe, Australia, Canada |
| Implied probability | Prediction markets (Polymarket and Kalshi) |
You saw what each format is above, so here is where you actually meet it and the one mistake beginners make with each.
American (moneyline) is what US sportsbooks use, so most American readers see this one first.
A minus number is the favorite (the team expected to win) and a plus number is the underdog (the team expected to lose).
Beginner mistake: thinking a bigger minus number is a better deal, when it actually means a smaller payout.
Fractional (English) is used by bookmakers in the UK and Ireland.
Read it left to right as "win the left number for every right number you stake", so 5/1 means you win $5 for every $1 you put on.
Beginner mistake: reading 5/1 as the total you get back, when it is only your profit (your $1 stake comes back on top).
Decimal (European) is used across most of Europe, plus Australia and Canada.
The number is your total return for every $1, so it already has your stake baked in.
Beginner mistake: adding your stake again on top, when it is already counted.
Implied probability is how prediction markets like Polymarket and Kalshi show their odds, written as a percent chance to win.
Beginner mistake: thinking the chances for one game add up to exactly 100%.
They add up to a bit more than 100%, because the sportsbook builds its own cut (its profit) into the prices.
Odds conversion chart
| Fractional | Decimal | American | Chance to win |
|---|---|---|---|
| 1/5 | 1.20 | -500 | 83.3% |
| 1/2 | 1.50 | -200 | 66.7% |
| 1/1 | 2.00 | +100 | 50% |
| 3/2 | 2.50 | +150 | 40% |
| 2/1 | 3.00 | +200 | 33.3% |
| 4/1 | 5.00 | +400 | 20% |
| 9/1 | 10.00 | +900 | 10% |
| 20/1 | 21.00 | +2000 | 4.8% |
The same common bets shown in all 4 formats, side by side.
How do you find good opportunities with the converter?
Here is how to use the converter to spot one, in 3 steps.
- Take a team's odds from a sportsbook and type them into the converter above to get the percentage, which is the chance the book is giving that team.
- Compare that to what the crowd gives them, like the live Polymarket number on our team and group pages.
- If the sportsbook's number is lower than the crowd's, the bet pays more than the crowd thinks it should, and that can be a good opportunity.
A good opportunity just means a price that pays more than the crowd thinks it is worth.
Let's say a sportsbook gives a team a 25% chance, but the crowd on a World Cup prediction market puts them at 33%.
The sportsbook is paying you as if the team is less likely to win than the crowd believes, so the price looks better than the crowd thinks it should be.
Nobody knows for certain how likely a team really is to win, these are just 2 different estimates, and you are betting that the crowd has it closer to right.
One honest warning: no edge is ever guaranteed, so only bet what you can afford to lose.
Common questions
How do you convert American odds to decimal?
It depends on the sign. For a plus number, divide it by 100 and add 1, so +500 becomes 6.00. For a minus number, divide 100 by the number and add 1, so -200 becomes 1.50. Or just type the American odds into the converter above and read the decimal off the other line.
What are decimal odds?
Decimal odds show the total you get back for every $1 you stake, with your stake already included. So 2.50 means a $10 bet returns $25 in total, which is $15 profit plus your $10 stake back. They are the most common format outside the US and the easiest to read, since the number is just your full return.
How do you turn betting odds into a percentage?
Divide 100 by the decimal odds. Odds of 6.00 give you 100 divided by 6, which is a 16.7% chance. That percentage is the implied chance to win, meaning how likely the bet is to land in the bookmaker's eyes.
What does +200 mean in betting?
It is the American price for an underdog, the team most people expect to lose. A $100 bet at +200 wins $200 in profit, so you get back $300 in total (your $100 stake plus the $200 you won). The plus sign always means the team is not the favorite.
What does -150 mean in betting?
It is the American price for a favorite, since the minus sign always means favorite. You stake $150 to win $100 in profit, so a winning bet returns $250 in total. The bigger the minus number, the stronger the favorite.
What are UK odds?
UK odds are just another name for fractional odds, written like 5/1. They tell you your profit per stake, so 5/1 means you win $5 in profit for every $1 you put on the bet. UK and Irish bookmakers use this format, while US sportsbooks use American odds instead.
How do you convert decimal odds to fractional?
Subtract 1 from the decimal, then write that as a fraction. So 3.50 becomes 2.50, which is 5/2, meaning $5 profit for every $2 you stake. Decimal 2.00 becomes 1/1, also called evens, or just type the decimal into the converter above and read the fraction off the other line.
18+ only. Gamble responsibly. Set a budget, never bet more than you can afford to lose, and get help on our responsible gambling page if needed.