| Decimal | |
|---|---|
| American | |
| Fractional | |
| Implied probability |
Enter a valid price for the chosen format.
Odds converter
Convert between decimal, American (moneyline) and fractional odds, and see the implied probability for any price. Enter a value, pick its format, and read the rest.
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Converting betting odds
Decimal odds show your total return per unit staked. American (moneyline) odds show how much you win on a 100 stake, or how much you must stake to win 100. Fractional odds show profit over stake. All three describe the same bet. This converter moves between them and adds the implied probability, the break-even chance the price is asking for.
From a price to a fair line
Implied probability still includes the bookmaker's margin. Strip that margin across a whole market with the no-vig calculator, weigh a price against your own estimate with the EV calculator, or find a locked-in profit across books with the arbitrage calculator.
Frequently asked questions
How do you convert odds to implied probability?
Implied probability is 1 divided by the decimal odds, shown as a percentage. Odds of 2.00 imply 50%. Odds of 1.50 imply about 66.7%. Enter any format above and this converter shows the implied probability alongside it.
How do decimal and American odds relate?
For decimal odds of 2.00 or more, American is (decimal minus 1) times 100. Below 2.00, American is -100 divided by (decimal minus 1). So 2.50 is +150 and 1.50 is -200. The converter does this both ways.
What does the implied probability tell me?
It is the break-even chance the price is asking for, including the bookmaker's margin. To see the fair, margin-free probability of a whole market, use the no-vig calculator instead.
Which odds format should I use?
Use whichever your bookmaker shows. Decimal is common in Europe and Australia, fractional in the UK, American in the US. The maths is identical. Only the presentation differs.
More free tools
Arbitrage Calculator
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Expected Value Calculator
Measure a bet's long-run value from its price and your estimated win probability.
No-Vig Calculator
Strip a bookmaker's margin from a market to see the fair, no-vig price it implies.