What is an Odds Converter?

An odds converter transforms betting odds from one format to another. Whether you prefer the simplicity of decimal odds used across Europe, the traditional fractional odds seen on UK racecards, or the American moneyline format used in US sports betting, our odds converter lets you work in whichever format you're most comfortable with.

How to Use the Odds Converter

Enter your odds in any format — decimal (e.g. 2.50), fractional (e.g. 6/4), American (e.g. +150), or implied probability (e.g. 40%)
Select the input format from the dropdown
Read the conversions — all equivalent values are shown instantly

No calculations required. The tool updates in real-time as you type.

The Maths Behind Odds Conversion

All odds formats express the same underlying probability. Here's how the conversions work:

Decimal to Fractional: Subtract 1 from the decimal odds, then express as a fraction. 2.5 becomes 1.5/1, which simplifies to 3/2.

Decimal to American: If decimal odds are 2.0 or higher, multiply (decimal - 1) by 100. So 2.5 becomes +150. If decimal is below 2.0, divide -100 by (decimal - 1). So 1.4 becomes -250.

Decimal to Implied Probability: Divide 1 by the decimal odds, then multiply by 100. 2.5 gives 40%.

Identifying Value: When your true probability estimate exceeds the implied probability, the bet has positive expected value.

Tips for Using Odds Correctly

Bookmaker margin: The sum of all implied probabilities in a market exceeds 100%. This "overround" is the bookmaker's built-in profit. Our converter shows you the exact implied probability so you can spot when bookmakers have priced markets too short.
Best odds guaranteed: UK bookmakers often offer Best Odds Guaranteed on horse racing. Always check the fractional odds on the racecard.
Price comparison: Once you know the decimal equivalent, comparing odds across bookmakers becomes much faster.

Frequently Asked Questions

What are decimal odds? Decimal odds show your total return per unit staked, including your stake. Odds of 2.50 mean you receive £2.50 for every £1 staked (£1.50 profit plus £1 stake returned).

What are fractional odds? Fractional odds show profit relative to stake. 3/2 means you win £3 for every £2 staked. Traditional in UK horse racing.

What are American odds (moneylines)? A positive number (+150) shows profit on a £100 stake. A negative number (-250) shows how much you must stake to win £100.

What is implied probability? The probability of winning implied by the odds. Decimal 2.0 implies a 50% chance. If you believe the true chance is higher, the bet has value.

Which odds format should I use? Decimal odds are easiest for calculating returns quickly. Fractional odds are standard in UK horse racing. American odds are used for US sports and on betting exchanges.