Odds converter
Convert any price between American, decimal, fractional and implied probability, plus Hong Kong, Malay and Indonesian odds.
Inputs
Result
updates as you typeRun this math on every line, automatically
Set the odds format once on your Account page and every tool uses it.
How it works
Every format describes the same thing: what a winning bet returns.
Decimal d: total return per $1 staked (2.50 returns $2.50, $1.50 profit)
American: +A = profit on $100 (d = 1 + A/100); −A = stake needed to win $100 (d = 1 + 100/A)
Fractional a/b: profit a for every b staked (d = 1 + a/b)
Implied probability = 1 ÷ d
Hong Kong odds are d − 1; Indonesian odds are the American price divided by 100; Malay odds are d − 1 up to even money and −1 ÷ (d − 1) beyond it.
Worked example
+150 is decimal 2.50, fractional 3/2 and an implied 40.00%. Common prices:
| American | Decimal | Fractional | Implied |
|---|---|---|---|
| −500 | 1.2 | 1/5 | 83.33% |
| −300 | 1.333 | 1/3 | 75.00% |
| −250 | 1.4 | 2/5 | 71.43% |
| −200 | 1.5 | 1/2 | 66.67% |
| −150 | 1.667 | 2/3 | 60.00% |
| −120 | 1.833 | 5/6 | 54.55% |
| −110 | 1.909 | 10/11 | 52.38% |
| −105 | 1.952 | 20/21 | 51.22% |
| +100 | 2 | 1/1 | 50.00% |
| +110 | 2.1 | 11/10 | 47.62% |
| +120 | 2.2 | 6/5 | 45.45% |
| +150 | 2.5 | 3/2 | 40.00% |
| +200 | 3 | 2/1 | 33.33% |
| +250 | 3.5 | 5/2 | 28.57% |
| +300 | 4 | 3/1 | 25.00% |
| +500 | 6 | 5/1 | 16.67% |
| +1000 | 11.00 | 10/1 | 9.09% |
Things to watch
- American odds between −100 and +100 don't exist. Even money is +100 (decimal 2.00).
- Fractions are rounded. Odd decimal prices have no exact simple fraction; the converter marks approximations with ≈.
Frequently asked questions
How do I convert American odds to decimal?
Positive: 1 + A/100 (+150 → 2.50). Negative: 1 + 100/A (−200 → 1.50).
What is +100 in decimal?
2.00: even money. A $100 bet returns $200.
What are fractional odds?
Profit relative to stake: 5/2 means $5 profit for every $2 staked, which is decimal 3.50 or +250.
Why does a −110 bet need more than 50% to break even?
−110 is decimal 1.9091, so it implies 52.38%. The extra 2.38 points is the vig.
Related calculators
Implied probability calculatorBreak-even win % for any price; add the other side for the no-vig fair.No-vig fair odds calculatorFair odds with five devig methods side by side, 2- to 6-way markets.Expected value (EV) calculatorEV, edge and Kelly from a fair %, fair odds or a two-sided market with the vig removed.Parlay calculatorCombined odds and payout for up to 12 legs, plus EV from fair %.