Odds Converter

If you've ever tried comparing odds across different sportsbooks, you know how frustrating it can be. One site shows +150, another shows 2.50, and a third has 3/2. They're all the same bet, but good luck figuring that out at a glance.

Different regions prefer different formats. American sportsbooks use the +/- system, European sites love decimals, and UK bookmakers stick with fractions. None of them are wrong—they're just different ways of expressing the same thing. But when you're trying to find the best line or calculate your potential payout, you need everything in one format.

That's where this calculator comes in handy. Plug in whatever odds you're looking at, and it'll instantly show you the equivalent in the other two formats. No mental math required.

American Odds (Moneyline)

American odds are built around a $100 bet, which makes them a bit weird at first. Positive numbers like +200 tell you how much profit you'd make on a $100 wager. So +200 means you win $200 on a $100 bet.

Negative numbers flip it around—they show how much you need to bet to win $100. If you see -150, you'd have to risk $150 to profit $100. The bigger the negative number, the heavier the favorite.

You don't actually have to bet $100, of course. The numbers just scale up or down based on your stake. But thinking in terms of $100 makes it easier to compare different bets quickly.

Decimal Odds

Decimal odds are way more straightforward. The number you see is your total return for every $1 you bet, including your original stake. Bet $10 at 3.00 odds and you get back $30 total—that's your $10 stake plus $20 profit.

Most people find decimals easiest to work with, especially for parlays. You can just multiply the odds together and boom—you've got your parlay odds. Try doing that with American odds and you'll see why Europeans are onto something.

Fractional Odds

Fractions show your profit relative to your stake. If you see 5/1 (read as "five-to-one"), you'll win $5 for every $1 you bet. Put down $20 and you'd profit $100, plus get your $20 back.

The tricky part is when you get odds like 11/8 or 13/5. You kind of have to do division in your head, which is why a lot of newer bettors prefer decimals. But traditional horse racing and UK betting shops have used fractions forever, so they're not going anywhere.

Let's say you're looking at an NBA game. Your local book has the Lakers at -140 to beat the Suns. You check a European site and they've got the Lakers at 1.71. Are those the same odds? Is one better?

Throw -140 into the converter and you'll see it equals 1.71 in decimal format. Same exact odds. Now you know you're not missing out on a better line somewhere.

But here's where it gets useful. That same calculator shows you the implied probability—in this case, about 58.33%. So the bookmaker thinks the Lakers have roughly a 58% chance of winning. If you think their actual chances are higher, that's a bet worth making. If you think it's lower, maybe skip it.

Every betting odd implies a certain probability of that outcome happening. The catch is that bookmakers build in their margin (the "vig" or "juice"), so the implied probabilities across all possible outcomes add up to more than 100%.

Still, seeing the implied probability helps you reality-check your bets. If a team has +300 odds, that implies about a 25% chance of winning. Does that sound right to you? If you think they actually have a 35% chance, you've found what's called "value"—that's when your assessment of the probability is higher than what the odds suggest.

Finding value is basically the whole game when it comes to long-term betting success. You can't just bet favorites and expect to come out ahead because of the vig. You need to find spots where your opinion differs from the market, and the implied probability helps you spot those opportunities.