Change Odds Format Calculator: American Odds to Decimal to Fractional

You can convert any odds format to another with USAbetting’s Change Odds Format Calculator. For instance, change American odds to their fractional and decimal versions. Try it out with our odds converter below, just input the odds you want to change:

How To Use The Odds Converter

Simply input a figure in any of the fields above, click submit and the rest of the form will populate. Here is a guide to what each part of the calculator means:

American Odds / Moneyline Odds / US Odds: These are the odds that you most likely see on the type of American sportsbooks that we review here on USAbetting. The format for American odds, for example, looks like this: +200 or, if the odds are odds-on, maybe -200.

Fractional Odds / UK Odds / British Odds: Fractional odds are actually used a lot in America. You often hear that a horse is, for example, 2/1 to win a race (2/1 is spoken as “two to one”). So although fractions are known as UK or British odds, actually they are fairly widely used this side of the Atlantic too. Taking 2/1 as an example, it means if you put a $1 bet on a winning 2/1 chance then you will win $2 profit, plus you also get your betting wager / stake back. You win “two” to a stake of “one”. So $3 will be returned to you.

Decimal Odds / European Odds/ Continental Odds: Decimal odds tell you the amount returned for every one unit wagered. That single unit is best thought of as $1. So if the decimal odds show as 5.00 then you will get $5 returned to you for a $1 bet, if that wager wins. With decimals you can see that your stake is included in the figure. That means that 5.00 is the same as 4/1 fractional odds (which would also return $5 to you for a dollar bet: $4 profit + $1 stake returned).

What you need to remember with all the three different types of odds format, is they all have different ways of expressing the same odds. 2/1 (fractional) and 3.00 (decimal) and +200 (American) are all the same. They will all give you a $20 profit to a $10 stake, and you then get your $10 stake returned. So in all cases $30 is returned to you, providing your wager wins of course.

Bet Size: The calculator above will also help work out the winnings from your bet. Just enter the odds of your winner and the bet size and then the net profit will be calculated automatically.

Net Profit: This field on the form above represents the profit you have made from your winner. It does not include the stake that will also be returned to you by the betting company. So $10 on a +200 (2/1) winner will show as a profit of $20. Remember you will also get that bet stake back, so you would actually receive $30 ($20 profit + your $10 original bet amount).

Percent / Implied Probability: This represents the odds as a percentage chance. The best way of explaining this is by example. A 99/1 selection has, according to the odds, only a 1% chance of winning. An evens (1/1 or +100) chance has a 50% chance of winning. The shorter the odds on a selection then the greater the percentage probability it will win. Sometimes on the moneyline a team can be very short odds to beat their opponent (say in an NFL game). They might be -500 (in American odds format) and those odds represented as a percentage probability of winning are just over 83%. Percentage probability is an indicator of how strongly or weakly the bookies’ odds reflect the chance of a selection winning. If you think the chance of that selection winning is greater than the percentage implied probability that the bookmaker is offering then you should probably have a bet, as you would then think the betting odds are too long and so represent good value. Implied probability will resonate most with people who enjoyed math at school. It is arguably a geeky thing and most bettors, even those very conscious of value, can probably get by quite happily without having to reference it.

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