Betting Odds Calculator
Convert betting odds between American, decimal and fractional formats, see the implied probability, and get the profit and total return on a stake. How it works
Use the Betting Odds Calculator
About the Betting Odds Calculator
American odds of -110 are 1.91 in decimal and 10/11 as a fraction, an implied probability of 52.38%: a $100 stake returns $190.91 if it wins, $90.91 of it profit. The odds calculator turns a price typed in any of its four boxes into the other three. Implied probability is 100 ÷ decimal odds and includes the bookmaker’s margin, so it describes the payout, not the chance of winning.
American odds in decimal, fractional and implied probability
| American | Decimal | Fractional | Implied probability | Profit on $100 | Total return on $100 |
|---|---|---|---|---|---|
| -300 | 1.33 | 1/3 | 75.00% | $33.33 | $133.33 |
| -200 | 1.50 | 1/2 | 66.67% | $50.00 | $150.00 |
| -150 | 1.67 | 2/3 | 60.00% | $66.67 | $166.67 |
| -110 | 1.91 | 10/11 | 52.38% | $90.91 | $190.91 |
| +100 | 2.00 | 1/1 | 50.00% | $100.00 | $200.00 |
| +120 | 2.20 | 6/5 | 45.45% | $120.00 | $220.00 |
| +150 | 2.50 | 3/2 | 40.00% | $150.00 | $250.00 |
| +200 | 3.00 | 2/1 | 33.33% | $200.00 | $300.00 |
| +300 | 4.00 | 3/1 | 25.00% | $300.00 | $400.00 |
| +500 | 6.00 | 5/1 | 16.67% | $500.00 | $600.00 |
Decimal odds to two places, as the calculator shows them. -100 and +100 are the same even-money price. The implied probability includes the bookmaker’s margin.
Frequently asked questions
- How do you convert American odds to decimal?
- For a plus price, divide by 100 and add 1: +120 is 2.20. For a minus price, divide 100 by the number without its sign and add 1: -110 is 1.91 and -200 is 1.50. Fractional odds N/M are 1 + N ÷ M, so 5/2 is 3.50, or +250.
- What does +150 mean in betting?
- A $100 stake wins $150 of profit and returns $250 with the stake. +150 is 2.50 in decimal odds, 3/2 as a fraction and an implied probability of 40.00%. Going the other way, decimal odds of 2.50 are +150 and decimal odds of 1.50 are -200.
- What does -110 mean in betting?
- You stake $110 to win $100. On a $100 stake, -110 pays $90.91 of profit and returns $190.91 including the stake. As a fraction it is 10/11 and as decimal odds 1.91.
- How do I calculate implied probability from odds?
- Divide 100 by the decimal odds. +300 (4.00) implies 25.00% and -150 (1.67) implies 60.00%. You can also type a percentage: 25 gives +300, 4.00 and 3/1. Both sides of a -110/-110 market add up to 104.76%; the part over 100% is the bookmaker’s margin, which is why implied probability is not the real chance.
- Why can’t American odds be between -100 and +100?
- Both signs are measured against 100: +A wins A on a stake of 100 and -A needs a stake of A to win 100, so +100 and -100 are both even money, 2.00 in decimal. The calculator treats -100 as +100 and shows a message for a price in between, such as 50.
- What fraction does the calculator show for a decimal price?
- A decimal typed with up to four decimal places gets its exact fraction, reduced: 2.50 is 3/2, 1.87 is 87/100 (-115 in American odds) and 1.33 is 33/100. A typed implied probability p gives (100 − p)/p, so 99.5 is 1/199. Only a longer decimal gets the simplest fraction within 0.001, with a note: 1.87654 shows 50/57.
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