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Odds Calculator

Use the odds calculator below to convert between American, Decimal, and Fractional odds. The odds calculator will also display implied win probability and payout amount. If you want to learn about the different odds formats we have a short guide below.

Odds Calculator


American Odds

American odds (sometimes called money line odds) are used by US sportsbooks. This odds format is represented by positive and negative numbers (example: -150 and +130). Here is an example from 5Dimes:

odds calculator

If a betting market has worse than even odds it is represented by a negative number. You need to risk that many dollars in order to profit $100. In the example above the Carolina Panthers have -150 odds to win the game. A bettor would need to risk $150 in order to profit $100 for a total return of $250.

If a betting market has better than even odds it is represented by a positive number. You would win that many dollars if you were to risk $100. In the example above the Houston Texans have +130 odds to win the game. A bettor who risked $100 would profit $130 for a total return of $230.

Decimal Odds

Decimal odds are (sometimes called European odds) are used by European betting sites. They are the easiest odds format to get the hang of since it directly represents the total payout or return from a winning bet.

odds calculator

A betting market with even odds is represented by 2.00. Markets worse than even will be less 1.99 or lower, and markets greater than even will be 2.01 or higher. In order to calculate your payout/return simply multiply the decimal number by the amount you are risking.

In the example above the Chicago Cubs have 1.57 odds to beat the Washington Nationals. If you were risking $200 on the Cubs you could determine your return by multiplying it by 1.57:

$200 * 1.57 = $314

It’s important to remember that this final number represents your total payout and not the profit. Decimal odds are the best option for parlays/accumulators as the total payout will be the product of the individual wager odds on your ticket.

Fractional Odds

Fractional odds (otherwise called British odds) are considered the old-school odds format. They indicate the profit one would stand to make relative to the amount staked.

odds calculator

A betting market with even odds in the fractional format would be represented by 1/1. Anything worse than even would have a smaller numerator than the denominator (example: 19/20). Anything better than even would have a larger numerator than the denominator (example: 16/5).

Fractional odds differ from decimal odds as they represent the profit instead of your total return. If you risk the denominator you will profit the numerator. In the example above Sunderland are 9/5 to win against Derby. If you were to risk $5 you would profit $9 (for a total return of $14).

This odds format is somewhat outdated. Today you will only find it being used for horse racing and when discussing large underdog markets (such as futures/championship odds).

Implied Probability

Implied probability is the conversion of betting odds into a percentage. It is a great tool to use when determining if a given bet has value. The implied probability represents the break-even percentage. This is the amount of times you would need to win a bet at those odds in order to break-even. You should only place a bet if you believe it has a greater chance of winning than the implied probability.

odds calculatorKeep in mind that the bookmaker’s commission is factored into this percentage. Two opposing betting markets each with equal odds would both have a 52.38% break-even percentage. Simply winning half of your -110 (1.91) wagers is not enough and it will leave you in the negative. This is the margin you need to overcome if you want to be a successful sportsbettor.