Easily switch between American, decimal, and fractional odds using our Odds Converter. Enter any line or price to instantly see its equivalent in every format — plus the implied probability that each set of odds represents. This helps you make true apples-to-apples comparisons across sportsbooks and markets, no matter how the odds are displayed.

Odds conversion examples

American, decimal and fractional odds describe the same price. Implied probability expresses that price as the percentage you need to break even.

Equivalent odds and break-even probabilities
American	Decimal	Fractional	Implied probability
−110	1.9091	10/11	52.38%
+150	2.50	3/2	40.00%
+100	2.00	1/1	50.00%

For positive American odds, divide 100 by the odds plus 100. For negative odds, divide the absolute odds by the absolute odds plus 100. With decimal odds, implied probability is 1 divided by the decimal price.

A price's implied probability includes the sportsbook's margin. It does not establish an outcome's true chance of winning. To remove the margin across a market, use the no-vig calculator. To compare the margin itself, use the hold calculator.

To convert a percentage in the tool, include the percent sign: enter 40%. This gives +150, 2.50 and 3/2.

Why use the Odds Converter?

Common questions we receive and strategies for using this calculator

Why should bettors use an Odds Converter?

Using an Odds Converter helps you make faster, more informed betting decisions. Here are the biggest advantages:

Global betting: Sportsbooks around the world use different odds formats. If you bet or shop lines outside your home country, converting odds lets you compare everything on equal footing.
Comparing prices: When you’re line shopping, odds may be listed as American, decimal, or fractional. Converting them quickly helps you see which book is offering the best value.
Risk assessment: Converting odds to implied probability shows the break-even probability at that price. It includes the sportsbook’s margin and does not establish the outcome’s true probability.
Versatility: As you get more experienced, you may prefer working in a single odds format. The converter lets you toggle formats instantly based on your strategy.

By standardizing odds into the format you prefer, you reduce confusion, spot mispriced lines faster, and improve your overall decision-making as a bettor.

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What are American odds, and why are they used?

American odds show how much you need to risk to win $100 (negative odds) or how much you win on a $100 bet (positive odds).

Example:
- –110 means you must risk $110 to profit $100.
- +110 means a $100 bet returns $110 in profit.

American odds are the standard format in the United States and often appear in Canada as well, but most of the world uses decimal odds. Regardless of the format, the underlying probabilities can be converted so bettors everywhere can compare prices on the same terms.

What are decimal odds and where are they used?

‍Decimal odds show the total return on a bet, including your stake.

Example:
- With decimal odds of 2.0, a $100 bet returns $200 ($100 stake + $100 profit).

This format is the standard across Europe, Australia, and most of the global sports betting market because it makes payouts easy to calculate at a glance.

What are fractional odds and where are they used?

Fractional odds are common in horse racing and still popular in the U.K. market.

They show profit relative to your stake.

Example:
- 3/1 fractional odds mean a $100 bet returns $300 profit plus your $100 stake, for a total return of $400.

What is implied probability?

Implied probability is the break-even percentage represented by a betting price. For example, +200 has an implied probability of 100 ÷ (200 + 100), or 33.33%.

That percentage comes from the price and includes the sportsbook’s margin. It is not a verified estimate of the outcome’s true chance of winning. Use a no-vig calculator to remove the margin across the market before comparing prices with your own probability estimate.

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Why does the converter say I entered decimal odds when I want to convert from probability?

Add a percent sign (%) when entering probabilities. For example: enter 33%, not 0.33, so the tool knows you're converting a probability — not decimal odds.