Odds calculator
Convert odds to implied probability, see how much margin the bookmaker has built in, and remove it to get fair probabilities and fair odds. Works with decimal, fractional and American odds, for 2-way and 3-way markets. Everything runs in your browser.
Total implied
104.8%
Bookmaker margin
4.81%
Decimal prices
2.10 / 3.40 / 3.60
| Outcome | Implied | Fair probability | Fair odds | Power method |
|---|---|---|---|---|
| Home | 47.6% | 45.4% | 2.20 | 46.0% |
| Draw | 29.4% | 28.1% | 3.56 | 27.8% |
| Away | 27.8% | 26.5% | 3.77 | 26.2% |
How it works
1. Convert to decimal. Fractional odds a/b become 1 + a/b. American odds of +150 become 1 + 150/100, and -200 becomes 1 + 100/200.
2. Implied probability = 1 / decimal odds. Decimal odds of 2.10, 3.40 and 3.60 imply 47.6%, 29.4% and 27.8%.
3. Total them. Those add to 104.8%. The extra 4.8% is the margin.
4. Remove the margin. Dividing each by 104.8% gives fair probabilities of 45.4%, 28.1% and 26.5%, or fair odds of 2.20, 3.56 and 3.77. The power method gives 46.0%, 27.8% and 26.2%.
Need this for every match, in code?
One bookmaker is noisy. Our football odds API returns bookmaker odds and de-vigged market probabilities as JSON, and the prediction API serves the consensus across bookmakers with a basis field. There is a 14-day trial with no card needed.
FAQ
Get de-vigged odds in your own app
Probabilities, odds, fixtures and live scores as JSON over one REST API. Try it free for 14 days, no card needed.
curl https://api.predictiqpro.com/odds/FIXTURE_ID \ -H "Authorization: Token YOUR_API_KEY"