Hero Mobile Odds Calculator

Free online bet calculator

It’s great to have a helping hand when you want to work out your bets. Our free online bet calculator does just that. It shows you how much you could win from a wide variety of bets – and will save you time when planning your wagers.

Bet calculator

Bet Type

Odds Format


Estimated Profit

Converted Odds and Implied Probability








Implied Probability

Total Outlay


Total Profit


Total Return


Remember, if your bet wins, your original stake is returned too. So add that value to the profit. That applies to your total payout figure for fractional and American odds. Decimal odds include your stake in your expected profit.

Calculate your odds

A bet calculator is an incredibly useful tool. Odds can be quite complicated – especially when you bet on parlays – so being able to work out your potential returns quickly and easily saves you a lot of time.

Using a free bet calculator enables you to see how your selections, and the odds for them, impact your returns and profit. Even the most experienced bettors still use bet calculators to help them work out the returns on particular bets.

The calculator is flexible and customizable. You can enter your own stake and the odds for a single bet or a range of multiple bets.

You will also find below an overview of the most popular bet types and markets to add to your knowledge when you are weighing up a wager.

If you need more detail, our Betting Glossary has definitions of all the major types of bet available to you.

Betting terms to know by heart

The simplest bet of all. A single stake on a single selection. All you need to do is work out who you think will win a particular event or correctly predict a specific outcome, decide on your stake, and bet on your selection. Our odds calculator will show how much you should expect to receive if you win.

Sports betting odds: American, decimal & fractional

Betting odds are not the same all over the world. Depending on where you are, you will be presented with one of three different formats. It’s always worth reminding yourself that the probability they are expressing is the same – and that you can convert from one to another quite easily. You can compare all three formats using our free online odds calculator.


Also known as moneyline odds or US odds, it is always displayed using a bet total of $100.

The odds for the favorite, which will have a minus sign (-) in front of them, show the amount you need to bet to win $100.

The odds for the underdog, which will carry a plus sign (+), show how much you will win if you bet $100 on your choice.

If the Kansas City Chiefs are the favorites to win, their odds might be -175, and you’ll have to bet $175 to win $100 – a total return of $275.

Their opponents, the Tampa Bay Buccaneers, may be priced at +145, and you’ll have to bet $100 to win $145 – a total return of $245.

Odds conversion table

You can convert your odds between American, decimal and fractional quickly and easily by using the table below. As you will see, the likelihood of the event you are backing to happen is the same. The “implied probability” is a mathematical expression of the percentage chance of the selection you are choosing being successful.

FractionalDecimalAmericanImplied Probability

How can you convert odds manually?

As you can see, it’s easy to switch between odds formats when you have a conversion table in front of you. However, what if you want to move across formats manually? We have a guide for each of the combinations you might see.

American to fractional
American to decimal
Decimal to American
Decimal to fractional
Fractional to American
Fractional to decimal

Odds calculator FAQs

How do you calculate the odds?
What are the different types of odds?
Which sports have the best odds?
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