Betting Odds Converter

Implied probability is 100 divided by the decimal odds. Decimal 4.0 implies a 25 percent chance, and decimal 1.5 implies about 66.67 percent. The tool shows this figure on the Implied % card.

Positive odds show the profit on a 100 stake, so +500 wins 500 on top of your stake. Negative odds show the stake needed to win 100, so -150 means you risk 150 to win 100. Even money is +100 or -100.

Fractional odds show profit over stake, so add 1 to the fraction to get decimal. 5/1 becomes 6.0, 1/2 becomes 1.5, and evens (1/1) becomes 2.0. To go back, subtract 1 from the decimal.

Fractional odds use small whole numbers, but decimal prices can be any value. The converter searches denominators up to 100 for the closest simple fraction and reduces it, so decimal 1.67 shows as 2/3 rather than an exact but ugly fraction.

No. The implied probability comes straight from the offered price, which already includes the bookmaker's margin, also called the vig or overround. Across all outcomes those implied probabilities add up to more than 100 percent, and that surplus is the margin.

Decimal odds are common in Europe, Australia and Canada, fractional odds are traditional in the UK and Ireland, and American moneyline odds dominate in the United States. The same bet can be quoted in any of them.

Decimal odds must be greater than 1, since 1.0 would mean no profit. A fractional denominator cannot be 0, and American odds cannot be 0. The plus sign on American odds is optional, so +500 and 500 are read the same way.

Decimal odds and the implied probability are rounded to two decimal places for display, while the American and fractional values are computed from the full precision decimal before rounding, so the four figures stay consistent with each other.

No. All conversions happen locally in your browser, so nothing about the odds you enter leaves your device.