Fixed-odds betting is a form of wagering against odds offered by a bookmaker or an individual or on a bet exchange. It involves betting on an event in which there is no fluctuation on the payout. In Australia, the practice is usually known as 'SP betting'.

For example: Dallas –9.5 (–110) or Washington +9.5 (–110) means you’d wager $110 for the chance to win an additional $100 if you bet on the spread. With money lines, the $100 reference point doesn’t mean you have to either bet $100 or enough to win $100 You can wager whatever amount you want and the odds would just break down proportionately. When betting against the spread, you will be doing so on a money line of -110, meaning you must wager $110 for every $100 you want to win. This means that for every dollar you bet, you get your stake back plus 20 cents. Now, we support responsible betting, but let’s assume you’re wagering more than $1. If you bet $100, you get $120: your $100 stake + $20 profit. Below, the calculation is similar to, but not the same as, the American odds equation. Profit = (Stake x Odds) – Stake. If the moneyline is positive, it is divided by 100 and add 1. Thus, +400 moneyline is the same as 5.0 in decimal odds. If the moneyline is negative, 100 is divided by the absolute moneyline amount (the minus signed is removed), and then 1 is added. For example, −400 moneyline is. Two to one (2/1) means the bookie estimates that the chances against it happening are twice as much as the chances of it happening. 10/1 means the chances against it happening are higher than for 2/1. 100/1 means the chances against it happening are much higher still.

Calculating fixed odds[edit]

It is customary with fixed-odds gambling to know the odds at the time of the placement of the wager (the 'live price'), but the category also includes wagers whose price is determined only when the race or game starts (the 'starting prices'). It is ideal for bookmakers to price/mark up a book such that the net outcome will always be in their favour: the sum of the probabilities quoted for all possible outcomes will be in excess of 100%. The excess over 100% (or overround) represents profit to the bookmaker in the event of a balanced/even book. In the more usual case of an imbalanced book, the bookmaker may have to pay out more winnings than what is staked or may earn more than mathematically expected. An imbalanced book may arise since there is no way for a bookmaker to know the true probabilities for the outcome of competitions left to human effort or to predict the bets that will be attracted from others by fixed odds compiled on the basis personal view and knowledge.

With the advent of Internet and bet exchange betting, the possibility of fixed-odds arbitrage actions and Dutch books against bookmakers and exchanges has expanded significantly. Betting exchanges in particular act like a stock exchange, allowing the odds to be set in the course of trading between individual bettors, usually leading to quoted odds that are reasonably close to the 'true odds.'

'The best of it'[edit]

In making a bet where the expected value is positive, one is said to be getting 'the best of it'. For example, if one were to bet $1 at 10 to 1 odds (one could win $10) on the outcome of a coin flip, one would be getting 'the best of it' and should always make the bet (assuming a rational and risk-neutral attitude with linear utility curves and have no preferences implying loss aversion or the like). However, if someone offered odds of 10 to 1 that a card chosen at random from a regular 52 card deck would be the ace of spades, one would be getting 'the worst of it' because the chance is only 1 in 52 that the ace will be chosen.

In an entry for L'Encyclopédie (the Enlightenment-era 'French Encyclopedia'), Denis Diderot cites a similar example in which two players, Player A and Player B, wager over a game of dice that involves rolling two six-sided dice. Player A wins if the dice add up to 12, of which there is only one possible case. Player B wins if the dice fall in any other combination, of which there are 35 possibilities.^[1] It is mathematically disadvantageous to make a bet if one gets'the worst of it.' Accordingly, for the bet to be 'fair,' the amount each player could potentially lose or gain from the wager should be adjusted, depending on the odds of their success.

Laying odds[edit]

When making a bet in which one must put more at risk than one can win, one is laying the odds. Rational bettors will do so only if the actual chances of an adverse outcome are low enough that the expected outcome even after deduction of taxes and any transaction costs is favorable to the person placing the bet. For example, if one bets $1,000 that it will rain tomorrow and can win only $200 but can lose the entire $1,000, one is laying odds that will rain tomorrow. Laying odds is reflected in the colloquial expression '[I would] dollars to doughnuts' — with which the speaker is expressing a willingness to risk losing something of value in exchange for something worthless, because winning that bet is a certainty.^[2]

Lay betting[edit]

'Lay betting' is a bet that something will not happen, so 'laying $50 on a horse' is betting the horse will not win. Bookmakers sell bets based on the odds of a specific outcome, but lay betting allows the bettor (in some English-speaking countries, the 'punter') to reverse roles with the bookmaker, using odds to sell the opposite outcome to the bookmaker. In this context, 'lay' is used in the sense of 'layman', i.e., a bet sold by someone who does not sell bets professionally.

What Does 100 Unit Bet Mean

Types of odds offered[edit]

There are three widely used means of quoting odds:

Fractional odds[edit]

Favoured by bookmakers in the United Kingdom and Ireland and common in horse racing, fractional odds quote the net total that will be paid out to the winning bettor relative to the stake. The term 'fractional odds' is something of a misnomer, especially when visually reinforced by using a slash (as opposed to, e.g., a colon or the word 'to' or 'on') to separate a potential gain from the amount that a bettor must wager in order to receive it upon a win, because the 'fraction' in question represents not the odds of winning or even the reciprocal of the odds of winning but rather the fraction (for any odds longer than 'even money' or chances of winning less than 50%, an improper fraction) of the amount at stake that the upside outcome represents. This fraction may be derived by subtracting 1 from the reciprocal of the chances of winning; for any odds longer than 'even money,' this fraction will be an improper one.^[3][4] Odds of 4:1 ('four-to-one' or less commonly 'four-to-one against') would imply that the bettor stands to make a £400 profit on a £100 stake. If the odds are 1:4 (read 'one-to-four', or alternatively 'four-to-one on' or 'four-to-one in favor'), the bettor stands to make £25 on a £100 stake. In either case, against or on, should he win, the bettor always receives his original stake back, so if the odds are 4:1 the bettor receives a total of £500 (£400 plus the original £100). Odds of 1/1 are known as evens or even money.

Not all fractional odds are traditionally read using the lowest common denominator. Perhaps most unusual is that odds of 10:3 are read as 'one-hundred-to-thirty'.

Fractional odds are also known as British odds,UK odds,^[5] or, in that country, traditional odds.

Decimal odds[edit]

Favoured in Continental Europe, Australia, New Zealand and Canada, decimal odds differ from fractional odds by taking into account that the bettor must first part with their stake to make a bet; the figure quoted, therefore, is the winning amount that would be paid out to the bettor.^[4][6] Therefore, the decimal odds of an outcome are equivalent to one plus the decimal value of the fractional odds; in the absence of built-in house advantage to cover overhead, profit margins, or (for an illegal enterprise) compensation for the fact that both chances of prosecution and penalties in the event of conviction tend to be higher for bookmakers than for clients, the decimal odds associated with a given outcome would be the decimal expression of the reciprocal of what the offering party assesses to be the outcome's chance of occurring.^[7] Thus, even odds 1/1 are quoted in decimal odds as 2. The 4/1 fractional odds discussed above are quoted as 5, while the 1/4 odds are quoted as 1.25. It is considered to be ideal for parlay betting because the odds to be paid out are simply the product of the odds for each outcome wagered on.

Decimal odds are also known as European odds, digital odds or continental odds and tend to be favoured by betting exchanges because they are the easiest to work with for trading, in this case the purchase and sale of upside and downside risk.^[5]

Moneyline odds[edit]

Moneyline odds are favoured by United States bookmakers and as such are sometimes called American Odds.^[4] There are two possibilities: the figure quote can be either positive or negative. Moneyline refers to odds on the straight-up outcome of a game with no consideration to a point spread.

Positive figures

If the figure quoted is positive, the odds are quoting how much money will be won on a $100 wager (done if the odds are better than even). Fractional odds of 4/1 would be quoted as +400 while fractional odds of 1/4 cannot be quoted as a positive figure.

Negative figures

If the figure quoted is negative, the moneyline odds are quoting how much money must be wagered to win $100 (this is done if the odds are worse than even). Fractional odds of 1/4 would be quoted as −400 while fractional odds of 4/1 cannot be quoted as a negative figure.

Even odds

Even odds are quoted as +100 or −100. Some but not all bookmakers display the positive symbol.

Odds conversion[edit]

To convert fractional odds to decimal, take the fractional number, convert it to decimal by doing the division, and then add 1. For example, the 4-to-1 fractional odds shown above is the same as 5 in decimal odds, while 1-to-4 would be quoted as 1.25.

The method for converting moneyline to decimal odds depends on whether the moneyline value is positive or negative. If the moneyline is positive, it is divided by 100 and add 1. Thus, +400 moneyline is the same as 5.0 in decimal odds. If the moneyline is negative, 100 is divided by the absolute moneyline amount (the minus signed is removed), and then 1 is added. For example, −400 moneyline is 100/400 + 1, or 1.25, in decimal odds.

See also[edit]

References[edit]

1. ^'Wager'. University of Michigan Library. Retrieved 1 April 2015.
2. ^Listening to America, Stuart Berg Flexner (Simon and Schuster, New York, 1982).
3. ^'Betting School: Understanding Fractional & Decimal Betting Odds'. Goal. 10 January 2011. Retrieved 27 March 2014.
4. ^ ^abcCortis, Dominic (2015). Expected Values and variance in bookmaker payouts: A Theoretical Approach towards setting limits on odds. Journal of Prediction Markets. 1. 9.
5. ^ ^ab'Betting Odds Format'. World Bet Exchange. Archived from the original on May 2, 2014. Retrieved 27 March 2014.
6. ^D., Chris. 'What is Fixed odds betting and Due Column betting?'. TBR. Retrieved 27 March 2014.
7. ^'Fractional Odds'. betstarter.com/. Archived from the original on April 2, 2014. Retrieved 27 March 2014.

External links[edit]

Action: A bet of any kind.

ATS: Abbreviation for Above the Spread

Back-door Cover: This term refers to meaningless points scored late in the game by the underdog team to cover the spread.

Book: A sportsbook or a betting establishment that offers odds and accepts wagers.

Bookie: A person (or establishment) that takes bets on the outcome of sporting events.

Cover: If you beat the spread by the required number of points, you’ve ‘covered’ the spread.

Edge: This is the advantage in any wager.

Favorite: This is the team that is expected to win.

Front-door Cover: This is the opposite of Back-door cover. It is used in reference to the favored team scoring meaningless points late in the game to cover the spread.

Futures bet: This refers to placing a bet on any future event in the season. For example, putting down a bet early in the football season for who will win a bowl game.

Handicapper: This is a person who studies and rates sporting events.

Handicapping: This is when someone tries to predict the outcome of any given game.

Home field advantage: The edge a team is supposed to have when they play on their home field. Since the home field is a familiar turf and in front of the home crowd, teams are expected to perform better than they would if they were travelling thus giving them an edge.

Hook: This is a half point added to football odds.

Line: This is the odds, points, money line, or point spread offered on football games.

Linemaker: This is someone that sets the odds, points, money lines, or point spreads for football games.

100 1 Bet Meaning Synonyms

Lock: This term is used to refer to an easy win.

Longshot: This is a term used to refer to an extreme underdog.

Moneyline: This refers to the amount of money a player must wager in order to win $100, or the amount of money a player wins if they put $100 on the underdog.

Oddsmaker: This is another term for the Linemaker. It is the person who sets the odds, moneyline, or point spread for football games.

Over/Under Bets: This refers to a bet on whether the combined total of the points scored by both teams will be more or less than a set number.

Overlay: This is a term to refer to odds that are higher than they should be. These odds favor the bettor not the house.

Parlay: This is a wager on two or more teams or outcomes where the selections must win in order for the bettor to win.

Past performance: This refers to any given team’s results in past seasons. This is particularly important when betting on NCAA football.

Player: This is a term that refers to any person that puts down a bet on any given sports event.

Point Spread: This is a number of points given to the underdog by the Linemaker in order to handicap the favorite. It can also be thought of in terms of the scoring differential between the two teams. The point spread is used to even the playing field.

Proposition Bet or Props: This is a bet placed on a specific aspect of the game, such as who will score first or how long the longest touch down pass will be.

100 1 Bet Meaning

Soft line: This refers to a line that has been adjusted because of the result of an action. It is not the true posted line.

100 1 Bet Meaning Dictionary

Underdog: This is a term that refers to the team that is expected to lose.

100 1 Bet Meaning Urban Dictionary

100 1 Bet Meaning Slang

Underlay: This is a term that refers to odds that lower than they should be. These odds favor the house and not the bettor.