Odds converter
Convert betting odds between decimal, American and fractional, and see what win rate you need to break even.
Enter odds in any format
Break-even win rate at these odds
50.00%The odds already include the bookmaker's margin, so the true chance of winning is usually a little lower than the implied probability. Totals are in whatever currency you stake.
How to convert betting odds
Every odds format describes the same price in a different way. Decimal odds show the total return per 1 staked, American odds show the profit on 100 or the stake needed to win 100, and fractional odds show profit relative to stake.
American odds to decimal
For positive odds, divide by 100 and add 1, so +150 is 2.50. For negative odds, divide 100 by the number without its minus sign and add 1, so -110 is 1.91.
Fractional odds to decimal
Divide the first number by the second and add 1. For example, 5/2 is 2.5 plus 1, which is 3.50 in decimal odds.
Decimal odds to American
If the decimal price is 2.00 or higher, subtract 1 and multiply by 100, so 2.50 is +150. If it is below 2.00, divide -100 by the decimal price minus 1, so 1.50 is -200.
Odds to implied probability
Divide 100 by the decimal odds. At 2.50, the implied probability is 40%, which means a bet at that price has to win 40% of the time to break even over the long run.
Betting odds conversion table
| American | Decimal | Fractional | Implied |
|---|---|---|---|
| -300 | 1.33 | 1/3 | 75.00% |
| -200 | 1.50 | 1/2 | 66.67% |
| -150 | 1.67 | 2/3 | 60.00% |
| -110 | 1.91 | 10/11 | 52.38% |
| +100 | 2.00 | 1/1 | 50.00% |
| +120 | 2.20 | 6/5 | 45.45% |
| +150 | 2.50 | 3/2 | 40.00% |
| +200 | 3.00 | 2/1 | 33.33% |
| +300 | 4.00 | 3/1 | 25.00% |
| +500 | 6.00 | 5/1 | 16.67% |
| +1000 | 11.00 | 10/1 | 9.09% |
Knowing your break-even rate is only half the picture. The ROI calculator shows what your win rate and average odds add up to over time, and the parlay calculator combines several prices into one payout.
FAQ
What does -110 mean in betting?
You stake 110 to win 100 in profit, for a total return of 210. In other formats, -110 is 1.91 in decimal, 10/11 in fractional and an implied probability of 52.38%.
What does +150 mean in betting?
You win 150 in profit for every 100 staked, for a total return of 250. In other formats, +150 is 2.50 in decimal, 3/2 in fractional and an implied probability of 40%.
What is implied probability?
It is the win rate a price needs to break even, worked out as 100 divided by the decimal odds. Because bookmakers build in a margin, the implied probabilities of every outcome in a market add up to more than 100%. Two sides at -110 add up to 104.76%.
Which odds format is used where?
American odds are standard in the US, fractional odds are traditional in the UK and Ireland, and decimal odds are common in Europe, Australia and Canada. Most sportsbooks and betting apps let you switch between them.
Does the odds format change my payout?
No. The format only changes how the price is displayed. Small differences can appear because prices get rounded, for example when a 1.91 price is shown as 10/11, which is exactly 1.909.
Why does a fractional price look different from my sportsbook?
The converter shows the simplest fraction that matches the price. Sportsbooks often round to a standard list of fractions, so a converted price can look slightly different without meaningfully changing the payout.
Are your prices paying off?
Bet Journal records every bet and shows your ROI by odds range, sport and bet type, so you can see which prices actually make you money. Free on iOS and web.