Odds converter
Free odds converter: type decimal, fractional or American odds, or a probability, and get the other three at once. Conversion table included.
Convert a price
Type in any one box. The other three update as you type.
Same price, four ways
Decimal odds2.50
- Fractional
- 3/2
- American
- +150
- Implied probability
- 40.0%
- A stake of 10 returns
- 25.00
- of which profit
- 15.00
Odds conversion table
The prices you meet most often, in all three formats, with the chance each one implies.
| Fractional | Decimal | American | Implied probability |
|---|---|---|---|
| 1/5 | 1.20 | −500 | 83.3% |
| 1/4 | 1.25 | −400 | 80.0% |
| 1/3 | 1.33 | −300 | 75.0% |
| 2/5 | 1.40 | −250 | 71.4% |
| 1/2 | 1.50 | −200 | 66.7% |
| 4/7 | 1.57 | −175 | 63.6% |
| 8/13 | 1.62 | −163 | 61.9% |
| 2/3 | 1.67 | −150 | 60.0% |
| 8/11 | 1.73 | −138 | 57.9% |
| 4/5 | 1.80 | −125 | 55.6% |
| 10/11 | 1.91 | −110 | 52.4% |
| 1/1 | 2.00 | +100 | 50.0% |
| 11/10 | 2.10 | +110 | 47.6% |
| 6/5 | 2.20 | +120 | 45.5% |
| 5/4 | 2.25 | +125 | 44.4% |
| 11/8 | 2.38 | +138 | 42.1% |
| 3/2 | 2.50 | +150 | 40.0% |
| 13/8 | 2.63 | +163 | 38.1% |
| 7/4 | 2.75 | +175 | 36.4% |
| 2/1 | 3.00 | +200 | 33.3% |
| 9/4 | 3.25 | +225 | 30.8% |
| 5/2 | 3.50 | +250 | 28.6% |
| 3/1 | 4.00 | +300 | 25.0% |
| 7/2 | 4.50 | +350 | 22.2% |
| 4/1 | 5.00 | +400 | 20.0% |
| 9/2 | 5.50 | +450 | 18.2% |
| 5/1 | 6.00 | +500 | 16.7% |
| 6/1 | 7.00 | +600 | 14.3% |
| 7/1 | 8.00 | +700 | 12.5% |
| 8/1 | 9.00 | +800 | 11.1% |
| 10/1 | 11.00 | +1000 | 9.1% |
| 12/1 | 13.00 | +1200 | 7.7% |
| 16/1 | 17.00 | +1600 | 5.9% |
| 20/1 | 21.00 | +2000 | 4.8% |
| 25/1 | 26.00 | +2500 | 3.8% |
| 33/1 | 34.00 | +3300 | 2.9% |
| 50/1 | 51.00 | +5000 | 2.0% |
| 100/1 | 101.00 | +10000 | 1.0% |
Three formats, one price
Decimal, fractional and American odds are three ways of writing the same thing: how much a bet pays. Where you live decides which one you see. Continental Europe and Australia mostly use decimal. The UK and Ireland still love fractions, especially in horse racing. US sportsbooks use American odds, also called moneyline odds, and in Canada you’ll meet both decimal and American prices.
None of them is more generous than the others. 2.50, 3/2 and +150 pay exactly the same. The converter above lets you read a price in the format your head works in.
- Decimal (2.50) is the total you get back for every 1 staked, stake included.
- Fractional (3/2) is profit over stake: win 3 for every 2 you put down.
- American (+150 or −120) has two modes. A plus number is the profit on a stake of 100. A minus number is how much you must stake to win 100.
The formulas
Everything goes through decimal odds, so these are the only ones you need:
| From | To decimal | Example |
|---|---|---|
| Fractional a/b | a ÷ b + 1 | 3/2 → 3 ÷ 2 + 1 = 2.50 |
| American +X | X ÷ 100 + 1 | +150 → 150 ÷ 100 + 1 = 2.50 |
| American −X | 100 ÷ X + 1 | −120 → 100 ÷ 120 + 1 = 1.83 |
| Probability p% | 100 ÷ p | 40% → 100 ÷ 40 = 2.50 |
Going the other way, the implied probability is 100 ÷ decimal odds. For American odds, a decimal price of 2.00 or more becomes a plus number, (decimal − 1) × 100. Anything below 2.00 becomes a minus number, 100 ÷ (decimal − 1).
A worked example
You see a tennis player at −110 on a US site and 1.91 on a European one. Same price? Run it: 100 ÷ 110 + 1 = 1.909, which rounds to 1.91. Yes, identical. As a fraction that’s 10/11, and the implied probability is 100 ÷ 1.91 = 52.4%.
That last number is the useful one. It’s the chance the player needs to win for the bet to break even. If you think the real chance is 55%, the price is good. If you think it’s 50%, you’re paying to play.
About the fractions
Decimal odds are rounded to two places, so 1.91 isn’t exactly 10/11 (that’s 1.909…). I show the fraction a bookmaker would actually print, 10/11, not the technically exact 91/100. For unusual prices the converter picks the simplest fraction that rounds to the same decimal.
What implied probability won’t tell you
It’s the bookmaker’s price turned into a percentage, with their margin still inside. It isn’t the true chance of anything. Add up every outcome in a market and you’ll land above 100%. The gap is the margin, and it’s the reason a bet at the “right” probability still loses money over time.
Bet only what you can afford to lose. 18+.
Odds converter: questions
How do I convert American odds to decimal?
For a plus price, divide by 100 and add 1: +150 is 150 ÷ 100 + 1 = 2.50. For a minus price, divide 100 by the number and add 1: −120 is 100 ÷ 120 + 1 = 1.83.
What do odds of 5/2 mean?
You win 5 for every 2 you stake, and you get the stake back on top. A stake of 10 returns 35: 25 profit plus your 10. In decimal that's 3.50, in American +250, and it implies a 28.6% chance.
Which odds format is the easiest to use?
Decimal. The payout is just stake × odds, the bigger number is always the bigger price, and parlay legs multiply directly. Fractional and American odds say the same thing with more arithmetic.
Why do the implied probabilities in a market add up to more than 100%?
Because the bookmaker's margin is inside the prices. Two sides of a coin-flip bet at −110 (1.91) each imply 52.4%, which adds up to 104.8%. The extra 4.8% is what the bookmaker keeps over time.
What are even odds?
A price that pays exactly what you stake: 1/1 in fractional (often written evens), 2.00 in decimal, +100 in American. It implies a 50% chance.