Odds Converter

Convert between decimal, fractional, and American odds formats. See the implied probability for any odds value.

Input format

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Info: Understanding odds formats

Decimal (2.50) — multiply by stake for total payout. Popular in Europe. Fractional (3/2) — shows profit relative to stake. Popular in UK. American (+150 / -200) — positive shows profit on $100, negative shows stake needed to win $100. Popular in US. You can set your preferred format across SignalOdds in settings.

Frequently Asked Questions

How do I convert American odds to decimal?

For positive American odds (e.g. +150): divide by 100 and add 1, giving 2.50. For negative American odds (e.g. -200): divide 100 by the absolute value and add 1, giving 1.50.

How do I convert fractional odds to decimal?

Divide the numerator by the denominator and add 1. For example, 3/2 becomes 3 / 2 + 1 = 2.50 in decimal.

What is implied probability?

Implied probability is the chance of an outcome as suggested by the odds. It is calculated as 1 / decimal odds. For example, decimal odds of 2.00 imply a 50% probability. If you believe the true probability is higher, you may have a value bet.

Which odds format is most common?

Decimal odds are the global standard and easiest for calculations. Fractional odds are traditional in the UK and Ireland. American odds are used by US sportsbooks. Most professional bettors prefer decimal because multiplication and value-bet calculations are simpler.