Sports Betting Odds Calculator

Sports betting can be a massively lucrative form of gambling. Nowadays, there are a huge variety of different odds, bets, and online sportsbooks available. This page now features the best betting odds calculator to quickly show how much money different bets can payout.

Our team of experts will also provide in-depth breakdowns of the different types of sports betting odds available online. We will explain exactly how these odds are converted in the most simplistic way possible.

Those looking to jump into the sports betting action should check out the sites below. Each is known for providing excellent odds and safe payment options, 24/7.

These are some of the most popular sports betting websites operating today. Each has been highly-rated by our experts and provides fantastic odds and designs.

Calculator

How to Use Our Betting Odds Calculator

Those completely new to sports betting may have a difficult time understanding how exactly our odds payout calculator works. Fortunately, it’s much simpler than one might initially expect. Below is a two-step guide that explains how to use our betting odds calculator for the first time.

  • First, enter the odds into one of three available spots: American (US, moneyline), Decimal (EU), Fractional (UK). This will convert them to the two other types of odds and give you the implied probability.
  • If you want to calculate the win and payout amounts too, enter the amount of money you wish to invest into the Bet Amount ($) box. Keep in mind that $100 is the minimum amount.

For more information on betting odds and conversion, check out the following video:

    Fractional Odds

    Fractional odds, commonly known as UK odds, are represented by a fractional setup (e.g. 3/1) and are commonly used for betting on sports.

    American Odds

    American odds, commonly known as US or moneyline odds, are represented by either a negative or positive line depending on the probability of both outcomes (e.g. +160, -225).

    Decimal Odds

    Decimal odds, commonly known as European odds, are represented by a decimal number (e.g. 1.44) and are widely used not just in the EU but all across the world, too.

Odds Conversion Chart

The way that betting odds are presented will vary depending on where you are located. Four different types of betting odds are commonly found today. Most online sportsbooks allow their members to choose which type of these odds are featured. Our bet calculator can make the conversion of these odds extremely easy!

Below is a quick look at the various types of sports betting odds you can find today.

American Fractional Decimal Implied Odds
-500 1/5 1.20 83.3%
-450 2/9 1.22 81.8%
-400 1/4 1.25 80%
-350 2/7 1.29 77.8%
-333.3 3/10 1.30 76.9%
-300 1/3 1.33 75%
-275 4/11 1.36 73.3%
-225 4/9 1.44 69.2%
125 5/4 2.25 44.4%
137.5 11/8 2.38 42.1%
900 9/1 10.00 10%
1000 10/1 11.00 9.1%
2000 20/1 21.00 4.8%
5000 50/1 51.00 2%
10000 100/1 101.00 1%
100000 1000/1 1001.00 0.1%

The Math Behind Converting Betting Odds

There’s plenty of math here; betting odds are just numbers, and the math is there to ensure they all make perfect sense! Whether we’re talking about simple odds conversion, implied probability, or other calculations, math is ever-present.

If you’re serious about wanting to become a successful sports betting enthusiast, you can’t keep relying on online calculators.

It’s extremely helpful to understand how to convert these odds to one another. Our betting odds calculator allows this to be done in seconds. Of course, understanding how to do this on your own without the need for a bet calculator has its advantages, too.

You have to be able to switch fractional to decimal, American to fraction, and everything in between within seconds.

It might seem complex, but once you understand what these numbers mean (Mason), we’re sure it won’t take too long for you to figure out the sports betting math.

American Odds Conversion

American to Decimal

For positive odds:
  • Formula: 1 + (American Odds / 100)
  • Example: +350 | 1 + (350 / 100) = 4.5
For negative odds:
  • Formula: 1 – (100 / American Odds)
  • Example: -160 | 1 – (100 / -160) = 1.63

American to Fractional

For positive odds:
  • Formula: American Odds / 100
  • Example: +300 | 300 / 100 = 3/1
For negative odds:
  • Formula: -100 / American Odds
  • Example: -200 | -100 / -200 = 1/2

Decimal Odds Conversion

Decimal to Fractional

  • Formula: Decimal Odds / 1 – 1
  • Example: 5 | 5/1 – 1 = 4/1

Decimal to American

For positive odds:
  • Formula: (Decimal Odds – 1) x 100
  • Example: 3.5 | (3.5 – 1) x 100 = 250
For negative odds:
  • Formula: -100 / (Decimal Odds – 1)
  • Example: 1.25 | -100 / (1.25 – 1) = -400

Fractional Odds Conversion

Fractional to Decimal

  • Formula: Fractional Odds + 1
  • Example: 5/4 | 5/4 + 1 = 2.25

Fractional to American

For positive odds:
  • Formula: Fractional Odds x 100
  • Example: 4/1 | 4/1 x 100 = 400
For negative odds:
  • Formula: -100 / Fractional Odds
  • Example: 1/4 | -100 / 1/4 = -400

Converting Odds to Implied Probability

Now, let’s turn our focus away from betting odds conversion and towards implied probability calculations! But first and foremost, what is implied probability?

It represents the behind-the-odds probability of a winning bet. It’s easier to explain it with an example.

For Example:
A bet with odds -300 (decimal 1.33, fractional 0.33/1) has an implied probability of 75%. This percentage means that the bet is supposed to win three of four occasions.

Understanding implied probability and being able to convert it from American/decimal/fractional odds on the fly will help you better assess the value of any given match.

The formula for calculating IP via American odds:

Positive odds:
  • 100 / (American Odds + 100) x 100 to result in a percentage
Negative odds:
  • American Odds divided by (American Odds + 100) x 100 to result in a percentage (eliminate negative symbols in front of American Odds)

Betting Odds Calculator FAQ

If you’re too lazy to find your answers in the above-featured number-bomb, here’s a nice little shortcut that ought to help you out.


American odds, also known as “moneyline odds” are the most common sports betting odds provided by sportsbooks in the US. These odds are presented with + and - symbols to identify the betting favorites and underdogs.

The - odds represent the money you need to bet in order to win $100. The + odds represent the amount of money that will be won by wagering $100.

Decimal odds are more commonly found in Europe. These odds represent the amount of money a bettor will win from a $1 bet.

Your bet is already included with these types of odds, saving bettors time trying to calculate how much profit they will earn on a given wager.

Of course, our betting odds calculator is available for the odds that do not clearly indicate profit.

Implied odds are simply a conversion of other traditional sports betting odds into a percentage.

These types of odds are meant to reveal the probability of an event happening. The lower the percentage, the riskier and more lucrative the sports bet will become.

If you want to learn how to convert fractional to positive American odds, all you have to do is take the value of fractional odds and multiply it by 100 (e.g., 3/1 times 100 equals 300).

To convert fractional to negative American odds, you have to divide -100 by the value of fractional odds (e.g., -100 divided by 1/5 equals -500).

If you want to learn how to convert decimal to positive American odds, you have to subtract one from the decimal value, then multiply it by 100 (e.g., 3.2 minus 1 multiplied by 100 equals 220).

To convert decimal to negative American odds, you have to divide -100 by the decimal value minus 1 (e.g. -100 divided by 1.5 minus 1 equal -200).

The formula for calculating implied probability via American odds is as follows.

For positive odds, you’ll want to divide 100 by the sum of American odds and 100. Multiply the result by 100 to get the IP percentage.

For negative odds, take the American odds value divided by the sum of American odds value and 100, and multiply it by 100 to get the result in a percentage. Eliminate both negatives in the formula (by multiplying by -1), otherwise, you’ll get the wrong results.

You can use our sports betting odds calculator for virtually all forms of sports betting. Heck, you can even use it for betting on esports too. The math is always the same, no matter what sort of a competition/discipline we’re talking about. The numbers don’t change. But other variables do, so you need to be in the know if you want to get some quick and easy returns.