Odds come in three formats — decimal, fractional, and American (moneyline) — and every one describes the same price differently. This converter translates any odds into all three formats at once and shows the implied probability: the break-even win rate a bet needs to be profitable.
How odds formats relate
Decimal odds (e.g. 2.50) show your total return per unit staked, stake included. Fractional odds (3/2) show profit relative to stake. American odds show how much you win on 100 (for a favourite, how much you must stake to win 100).
Implied probability is the key number underneath all three: it is 1 divided by the decimal odds, expressed as a percentage. A price of 2.50 implies 40% — meaning a bet at those odds needs to win more than 40% of the time to be profitable.
Comparing implied probability to your own estimate of an outcome’s true chance is how you find value. If you think something is more likely than the odds imply, the bet is +EV.
Worked example
Enter decimal odds of 2.50. The converter returns +150 in American format and 3/2 in fractional format.
The implied probability is 1 ÷ 2.50 = 40%. So a bet at 2.50 breaks even if it wins exactly 40% of the time.
If your own model says the outcome wins 45% of the time, the price is in your favour — a value bet. That gap between implied and estimated probability is your edge.