Free Odds Converter: Decimal, Fractional & American Odds

Convert any price between decimal, fractional and American odds, and see the implied probability and your returns instantly.

Type a price into any box and the other formats update as you type. Read on for how each format works and a table of common conversions.

How betting odds work

Betting odds tell you two things: how much a bet pays, and how likely the bookmaker thinks it is. The three formats say exactly the same thing in different ways:

• Decimal odds (2.50) show your total return for every £1 staked, including your stake.
• Fractional odds (6/4) show your profit compared with your stake: win £6 for every £4 you bet.
• American odds (+150) show your profit on a 100 stake for underdogs, or how much you need to stake to win 100 for favourites (−200).

So 2.50, 6/4 and +150 are the same price. A £10 bet returns £25 in total, which is £15 profit plus your £10 stake back, and the implied chance of winning is 40%.

How decimal odds work

Decimal odds are the simplest format. Multiply your stake by the odds and you get your total return, with your stake already included.

Total return = stake × decimal odds

The lower the number, the more likely the bookmaker thinks it is. Anything below 2.00 is a favourite, and anything above is an outsider. Decimal odds are standard across Europe, at sharp bookmakers like Pinnacle and on betting exchanges, and they're what OddsHub uses throughout.

How fractional odds work

Fractional odds are the traditional UK format, still common in horse racing and on high street bookmakers. The first number is what you win, the second is what you stake.

• 6/4 means win £6 for every £4 staked. A £10 bet makes £15 profit, £25 back in total.
• 2/1 means win £2 for every £1 staked. A £10 bet makes £20 profit, £30 back in total.
• 4/6 means win £4 for every £6 staked. A £10 bet makes £6.67 profit, £16.67 back in total.

The catch with fractional odds is that they show profit only. To get your total return, you have to add your stake back on, which is why comparing prices like 8/13 and 4/7 in your head is hard.

Odds-on, odds-against and evens

• Odds-against means the first number is bigger, like 5/2. You win more than you stake, and the bookmaker thinks it's less likely than not.
• Odds-on means the first number is smaller, like 4/6. You win less than you stake, and the bookmaker thinks it's more likely than not.
• Evens (1/1) means you win the same as you stake. It's 2.00 in decimal odds and +100 in American odds.

How American odds work

American odds (also called moneyline odds) use a plus or minus sign and work from a base of 100.

• Plus (+150) shows the profit on a 100 stake. +150 means a £100 bet makes £150 profit. It's always an outsider.
• Minus (−200) shows how much you need to stake to make 100 profit. −200 means you stake £200 to make £100 profit. It's always a favourite.

American odds are standard in the US, so you'll see them if you follow American sports or US bookmakers.

How to convert betting odds

Going the other way, decimal to American: for odds of 2.00 or above, (decimal − 1) × 100, shown with a plus. Below 2.00, −100 ÷ (decimal − 1).

Or skip the maths and use the converter above.

Common odds conversions

Odds as probability

Every price is a probability in disguise. Divide 1 by the decimal odds and you get the chance the bookmaker's price implies: 2.50 is 40%, 4.00 is 25%.

That implied probability includes the bookmaker's margin, so it isn't the true chance. Add up the implied probabilities for every outcome in a market and you'll get more than 100%. The extra is the margin. Our no-vig odds calculator removes it to show the fair odds, and our guide to expected value explains how to use them to find bets worth taking.

Prices also change all the time as money and news come in. Why do betting odds change? explains what each move means.

Which odds format is best?

All three show the same price, so none is more accurate. Which one you use mostly depends on where you live:

• UK and Ireland: fractional odds are traditional, especially in horse racing and at high street bookmakers, though most online bookmakers now offer decimal too.
• Europe, Australia and South America: decimal odds are the standard.
• United States: American odds are the default at US sportsbooks.

If you're free to choose, decimal odds are the easiest to work with:

• Your total return is one multiplication.
• Comparing two prices is instant: 2.10 is bigger than 2.05.
• Implied probability is simply 1 divided by the odds.

That's why most bettors use decimal odds. OddsHub shows prices in decimal by default, but you can switch to fractional or American odds in your settings, and most bookmakers let you change format in your account too.

Compare odds across 490+ bookmakers for free

Knowing how to read odds is the first step. Getting the best price is the next. The same bet can be 2.10 at one bookmaker and 2.30 at another, and that difference adds up over hundreds of bets. OddsHub compares odds across 490+ bookmakers for free, so you can see the best price for any match in one place.