Technically, probability should always be a number between 0 and 1. It's often expressed as a percentage though, which makes things easier for the purposes of betting. 0.7059 converted into a percentage (i.e. multiplied by 100) gives us 70.59%. What this means is that the odds suggest the Celtics have a 70.59% chance of winning. If we believe the Celtics have an even greater chance of winning, then we should back them at odds of -240.
They do this by manipulating the lines to entice action where they need it. If they have too much action coming in on one team, they will adjust the lines to pay out less for that team to deter more bets. At the same time, they will adjust the line for the other team to pay out more to entice more action on that side. This dance continues until the game starts to try and get the correct amount of money on each side of the contest.

In cases when there is a point spread and moneyline offered on an event, such as an NFL football game, many bettors will place a wager on the moneyline and point spread of an underdog they feel has a chance to pull the upset. They will safely bet the point spread because they feel the game will be close, but will also put themselves in line for a nice payday if the underdog wins straight-up.
If you want to bet on football, then you have plenty of options. There are not only lots of games you can bet on, there are also lots of different types of wagers you can place. Point spreads and totals are the most popular types, by quite a distance, and many football bettors stick solely to those. This isn't really the ideal approach, as some of the other wagers can be very useful in the right circumstances.
covering a spread - When a team surpasses the expectations of a point spread set by football experts. For instance, if a team is expected to win by 10 points, and they actually win by 11 or more, this is called 'covering' the point spread. If the team wins by nine or less, or they lose the game, this is called NOT 'covering' the point spread. If the team wins by exactly 10 points, this results in a push or tie.
These bets are less popular as of now, but most sportsbooks are starting to offer them as they are growing in popularity. The reason for the growth is that more people are starting to understand them and see that they can help you cut down some variance and risk, while still ensuring that there is no draw. The reason for the name is that these bets are growing extremely quickly in popularity in the Asian countries and betting markets. Most online sportsbooks are starting to offer these fairly regularly now.
Bovada gives all first time college football bettors a 50% to $250 bonus when they make their first deposit which only allows you to wager on more spreads. Bovada welcomes USA players and has many great deposit methods to boot. Players are able to instantly add funds to their accounts using a variety of methods that include credit cards (Visa/MC/Amex), debit cards (Visa/MC), several brands of prepaid gift cards, cash wire transfers (Western Union + MoneyGram), and even payment through accepted Bitcoin wallets.
If the bookmaker was only confident enough to give Seattle a field goal’s lead on the Patriots, it was clearly going to be a tight game. Oddsmakers aren’t often that wrong about flagship games like the Super Bowl. All things being equal, it’s likely the betting public would have taken the Seahawks to win the game and have been done with it. But throw in the point spread that gave the Patriots 2.5 points, and the proposition seems more equal.
Two possibilities existed for Seahawks backers at this point – either the team would win the game by at least three points or not. There was no possibility for a push, thanks to the use of a half-point. It’s impossible to score a half-point in football, so thanks to the magic of rounding, there’s no room for a tie outcome. Those who backed the Patriots were looking at two possible outcomes, too – either New England would pull off the upset or they would lose by just a point or two. Both would turn out in a win.
The number that follows the plus or minus sign will indicate how big of a favorite or an underdog the team is. The larger the number is, the bigger the favorite or the underdog the team is. For example, a team that is -300 is a bigger favorite than a team that is -150. A team that is +240 is a bigger underdog than a team that is +130. Remember, this is not the sportsbook’s actual prediction on who they think will win; it’s in relation to the money that has been bet on the game. It is more depictive of who the betting public thinks is going to win the game.
A Parlay is a wager which combines several legs in a wager where the winnings from each selection roll onto the next. For a Parlay to be successful, all individual legs in the Parlay need to be winning selections. In the event of a tie in one of your selections in a parlay, the parlay is reduced to the next lowest number of teams. For example, if you have a 4 team parlay and one of the selections is a tie (only on 2 way markets), the leg would be considered a "push". In this instance, the 4 team parlay would then become a 3 team parlay and would be settled at reduced odds to reflect a winning 3 team parlay.
When betting on the underdog, the first step is the same. Divide the positive moneyline by 100, which in the case of the Grizzlies in the above example would give you 2.10. Then, multiply your stake by that number to get your potential winnings. $450 multiplied by 2.10 is $945. Essentially, this means if you risked $450 on the Grizzlies, you would stand to win $945.
If the implied probability says that you have to win a bet 40% of the time to break even, and you think you’re likely to win the bet 45% of the time, then there is value in the bet. Remember, the sportsbook pays you more the less likely something is to happen. This means you’ll be getting paid as if the bet is only going to hit 40% of the time (more money), but the bet actually hits 45% of the time if you are right.
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The true purpose of a pointspread when it is released by any sportsbook is to try and attract an equal amount of betting action on either side of a matchup. If all the early money is flooding in on New England as the favorite with a seven point spread, the betting outlet handling this action is likely to move that betting spread to 7.5 points to try and attract some money towards Miami as the underdog.
Actually handicapping games is far from simple though. Or, at least, handicapping them well is. There are all kinds of different factors that can affect the outcome of a game, and you need to take as many of them as possible into account. You also need to assess just how much of an impact those factors will have, and try to accurately evaluate just how likely a team is to win. For more advice on how to do this, please see the following article.
Parlays - these might be the most popular bets out there, especially among novice and amateur bettors, perhaps because of the lure of betting a small amount for a potentially big payoff. But they are fool's gold at best. Parlays involve wagering on two or more games on the same bet following the casino's pre-determined payout scale. Each game on a parlay must win for the bet to be a winner.
Here in this point spread example for the NFL, the Falcons are playing the Panthers. Atlanta has been set as a three-point favorite on the betting line. That means that for Atlanta to cover the spread that has been set, they will need to win by at least four points. And for Carolina to cover the point spread, they can do so with a loss by two points or less, or obviously a win straight up. If the Falcons win by exactly three points, the bet would result in a push with no payouts.

If the public comes out and bets really hard on one side, the line is going to move a lot making the odds worse on that side and a lot better on the other side. If you’re planning to bet against the public, you should wait to bet until the line moves as far as you think it is going to. Be careful, though, if you wait too long and some big money bettors bet, they can move the line back.
As we did with the underdogs, we need to figure out how much we will profit for each $1 that we wager. For underdogs, we divided the moneyline number by 100. For favorites, it is the exact opposite. We will take 100 and divide it by the money line number. So, for this example, we will take 100 and divide by 155 and get about $0.645 or about $0.65 in profit for every dollar that we bet.
Although the examples from above are in $100 increments, you don’t actually have to bet those exact amounts. That’s just how the odds are set up so that everyone is on the same page. With a quick glance at the numbers, you can tell who is the favorite, who is the underdog and what type of payout you can expect on each. You’re free to bet $5, $500 or whatever amount fits your budget. If you want to find out the specific betting limits for each option, browse through the betting sites rating guide in order to find the sportsbook that better fits your minimum and maximum limits.
Have you ever heard of moneyline betting? It's an American term that's traditionally associated with betting on the major US sports. These wagers are available in other parts of the world too, but they're typically referred to as win bets. The same principle applies though. When you correctly select which team will win a match, you'll get paid out at the relevant odds.
Buying points: Changing the point spread in order to favor your chances of winning. The odds here are proportionally lowered. Buying points allows the option of moving the point-spread on totals in your favor when betting on football or basketball (college and pro). You’re able to move the line up to 2 points. For every ½ point you want to buy, you must risk 10% (10 cents) in extra juice (except when buying on/off of a 3 in NFL).
What the sportsbook does to fix this is they "spot" the underdog team some points to make it fair. Obviously, these points aren't included in the actual score to determine who wins or loses the game, but they are calculated in to determine who "wins" the game in the sportsbook's eyes. If you ever played basketball as a kid against an older sibling or your dad, they would sometimes "spot" you some points to make it fairer. Let's say you were playing to 20 points, they might "spot" you 10 points to make it fairer. They would then have to score 20 points to win, but you would only have to score 10. This gives you a chance actually to win the game.

Conversely, in most other countries financial spread betting income is considered taxable. For example, the Australian Tax Office issued a decision in March 2010 saying "Yes, the gains from financial spread betting are assessable income under section 6-5 or section 15-15 of the ITAA 1997".[6] Similarly, any losses on the spread betting contracts are deductible. This has resulted in a much lower interest in financial spread betting in those countries.

A teaser is a bet that alters the spread in the gambler's favor by a predetermined margin – in American football the teaser margin is often six points. For example, if the line is 3.5 points and bettors want to place a teaser bet on the underdog, they take 9.5 points instead; a teaser bet on the favorite would mean that the gambler takes 2.5 points instead of having to give the 3.5. In return for the additional points, the payout if the gambler wins is less than even money, or the gambler must wager on more than one event and both events must win. In this way it is very similar to a parlay. At some establishments, the "reverse teaser" also exists, which alters the spread against the gambler, who gets paid at more than evens if the bet wins.
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