Wager Mage
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What does 1 in 500 mean?

A 1 in 500 chance of winning, or probability of winning, is entered into this calculator as "1 to 500 Odds are for winning". You may also see odds reported simply as chance of winning as 500:1. This most likely means "500 to 1 Odds are against winning" which is exactly the same as "1 to 500 Odds are for winning."

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For 3 to 9 odds for winning; Probability of: Winning = (0.25) or 25% Losing = (0.75) or 75% "Odds for" winning: 1:3 "Odds against" winning: 3:1

Calculator Use

Convert stated odds to a decimal value of probability and a percentage value of winning and losing. This calculator will convert "odds for winning" an event or "odds against winning" an event into percentage chances of both winning and losing. Be careful if you are using sports teams odds or betting odds. If you see that the Patriots super bowl odds are 9/2, that is most likely "odds against" and should be entered in the calculator with "Odds are: against winning." When playing a lottery or other games of chance be sure you understand the odds or probability that is reported by the game organizer. A 1 in 500 chance of winning, or probability of winning, is entered into this calculator as "1 to 500 Odds are for winning". You may also see odds reported simply as chance of winning as 500:1. This most likely means "500 to 1 Odds are against winning" which is exactly the same as "1 to 500 Odds are for winning."

Probability Formulas:

This calculator will convert "odds of winning" for an event into a probability percentage chance of success. Odds, are given as (chances for success) : (chances against success) or vice versa. If odds are stated as an A to B chance of winning then the probability of winning is given as P W = A / (A + B) while the probability of losing is given as P L = B / (A + B). For example, you win a game if you pull an ace out of a full deck of 52 cards. Pulling any other card you lose. The chance of winning is 4 out of 52, while the chance against winning is 48 out of 52 (52-4=48). Entering A=4 and B=48 into the calculator as 4:48 odds are for winning you get

For 4 to 48 odds for winning;

Probability of:

Winning = (0.0769) or 7.6923%

Losing = (0.9231) or 92.3077%

"Odds for" winning: 1:12 (reduced from 4:48)

"Odds against" winning: 12:1 (reduced from 48:4)

Probability vs. Odds

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What does 6.5 mean in football?

For example: Green Bay –6.5 means that Green Bay is the favorite and must win by at least 7 points. Chicago +6.5 means that Chicago is the underdog and has been “spotted” or “given” 6.5 points; if Chicago loses by 6 or fewer points, it is a winning bet (if Chicago pulls an outright upset, it is also a winning bet).

What does line mean in sports betting?

What does “line” mean as a sports betting term?

Another term for “point spread.” It is the betting “line” or gambling odds used to determine the parameters for wagering on either the favorite or underdog in a sporting event. The practice of wagering on a line was encourages betting on both sides involved in the contest. Rather than just picking an outright winner, gamblers are able to wager on the final margin of victory, with the favorite needing to win by a certain number of points and the underdog needing to stay within a certain range of points. For example: Green Bay –6.5 means that Green Bay is the favorite and must win by at least 7 points. Chicago +6.5 means that Chicago is the underdog and has been “spotted” or “given” 6.5 points; if Chicago loses by 6 or fewer points, it is a winning bet (if Chicago pulls an outright upset, it is also a winning bet). Usually, there is a 10 percent “juice” that the house or sportsbook charges for line betting. For example: Green Bay –6.5 (–110) or Chicago +6.5 (–110) means you’d wager $110 for the chance to win an additional $100 if you bet on the point spread. Depending on which side is receiving the most action, a sportsbook will often move the line up or down in order to incentivize betting on the less popular side. Injuries or unforeseen changes can also impact a gambling line. Lines are often listed with a half-point (ex: 6.5) in order to prevent the final margin from landing exactly on the point spread (ex: 7-point spread, final score of 20–13). A “push” or “tie” usually goes to the house or sportsbook, unless another arrangement has been agreed upon beforehand.

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