Odds Converter — Decimal, Fractional & American

Convert Your Odds

How to Convert Between Odds Formats

Decimal to Fractional

Subtract 1 from the decimal odds, then convert to the simplest fraction. For example, 2.50 - 1 = 1.50 = 3/2. Decimal 3.25 = 2.25 = 9/4.

Decimal to American

If decimal >= 2.00: American = (decimal - 1) x 100, with a + sign. If decimal < 2.00: American = -100 / (decimal - 1). For example, 2.50 = +150; 1.50 = -200.

Fractional to Decimal

Divide the numerator by the denominator and add 1. For example, 5/2 = 5/2 + 1 = 3.50. 3/1 = 3/1 + 1 = 4.00.

American to Decimal

If positive (+): decimal = (american / 100) + 1. If negative (-): decimal = (-100 / american) + 1. For example, +150 = 2.50; -200 = 1.50.

Implied Probability

The implied probability is 1 / decimal_odds x 100. For decimal 2.50, the implied probability is 1/2.50 = 40%. This represents the bookmaker's assessment of the likelihood of that outcome.

Common Odds Conversions

Which Odds Format Should You Use?

The odds format you use depends largely on your location and the bookmaker:

• Decimal odds are the standard in Europe, Australia, Canada, and most of the world. They are the easiest to calculate returns for: simply multiply your stake by the decimal odds.
• Fractional odds are traditional in the UK and Ireland. They show the profit relative to the stake. For example, 5/2 means you profit 5 units for every 2 staked.
• American odds (moneyline) are standard in the US. Positive numbers show profit on a 100-unit stake; negative numbers show how much you need to stake to win 100 units.

For dutching calculations, decimal odds are always the easiest to work with because the math is straightforward. Use this converter to translate odds from any format into decimal before using our dutching calculator.