Convert any price
Odds converter
- American
- +150
- Decimal
- 2.50
- Fractional
- 3/2
40.0%implied chance
A winning 10 stake returns 25.00, which is 15.00 profit plus your stake back.
Decimal odds
Multiply your stake by the decimal odds to get your total return, stake included. £10 at 2.50 returns £25: £15 profit and your £10 back. Decimal odds are standard across Europe, Canada and Australia.
American odds
Positive numbers show the profit on a 100 stake: +150 pays 150 profit on 100. Negative numbers show what you must stake to win 100: -110 means staking 110 to win 100. US sportsbooks use this format.
Fractional odds
Profit over stake. 5/2 pays 5 profit for every 2 staked, so £10 wins £25 profit. Fractional odds are still common in UK and Irish racing, often alongside each-way bets.
The margin hiding in every market
Turn both sides of a match into implied chances and add them up. A fair coin-toss market would be 50% + 50% = 100%. If a sportsbook offers -110 on both sides, each implies 52.4%, so the market adds up to 104.8%. That 4.8% is built-in margin, and it is why comparing prices between sportsbooks matters (margins and value, explained).
Odds across several bets
The same maths applies to every type of bet. In a parlay the decimal odds of each leg multiply, and so does the margin: the parlay calculator shows how much you give up with every extra leg.
Compare licensed sportsbooks where you are: US states, Canada, UK.
Questions people ask
What does a minus sign mean in American odds?
It marks the favourite. -200 means you must stake 200 to make 100 profit.
What is implied probability?
The chance the price suggests, worked out as 1 divided by the decimal odds. Decimal 2.00 implies 50%.
Why do the implied chances add up to more than 100%?
That extra is the sportsbook's margin, often called the vig or overround. The lower it is, the better the prices for you.
Which format is best?
None. They are the same price written three ways. Use whichever your sportsbook shows; the converter switches between them.
Spotted an error? We correct within 48 hours. Editorial policy