These are in terms of 100 and each one will have a plus or minus. They are in 100 because it's a 1:1 ratio, which means for every $1 you bet, you'll win $1 if your bet wins. If it's a plus, you'll win more than $100 on a $100 bet and a minus means you'll have to bet more than $100 to win $100.

A very simple explanation of probability would be a coin toss, in which the two possible outcomes are heads or tails. The probability of getting heads is a one in two chance, which can be represented as odds of 1/1, which would mean the outcome has a 50% chance of winning.

The first number tells you how much you could win, the second number is the amount you bet. So, if the odds are listed as 2-1, you'll get $2 for every $1 you bet.

5-1 Betting Odds means that out of 6 possible outcomes, the 5/1 odds are that there will be 5 of one kind of outcome and 1 of another kind of outcome. The 5-1 odds calculation means for every 6 betting events your selection should win 1 time and on 5 occasions the selection will not win.

For example, 3/1 odds mean you profit three times the amount you wagered. A $1 bet at 3/1 would pay out $4 in total, or a $3 profit and your $1 original wager. Conversely, 1/3 odds mean you profit a third of what you wagered.

Guide to Reading Betting Odds: What they Mean & How to Use Them

What if odds are 4 to 1?

4 to 1 Implied Probability

The 4-1 betting odds probability is an 80.00 per cent probability of a particular outcome and a 20.00 per cent probability of another outcome. The 4/1 odds implied probability means your selection has a 20.00% chance of winning and an 80.00% chance the selection will lose.

10-1 Betting Odds means that out of 11 possible outcomes, the 10/1 odds are that there will be 10 of one kind of outcome and 1 of another kind of outcome. The 10-1 odds calculation means for every 11 betting events your selection should win 1 time and on 10 occasions the selection will not win.

7-1 Betting Odds means that out of 8 possible outcomes, the 7/1 odds are that there will be 7 of one kind of outcome and 1 of another kind of outcome. The 7-1 odds calculation means for every 8 betting events your selection should win 1 time and on 7 occasions the selection will not win.

8-1 Betting Odds means that out of 9 possible outcomes, the 8/1 odds are that there will be 8 of one kind of outcome and 1 of another kind of outcome. The 8-1 odds calculation means for every 9 betting events your selection should win 1 time and on 8 occasions the selection will not win.

They are typically written with a slash (/) or hyphen (-). A fractional listing of 6/1 (six-to-one) odds would mean that you win $6 against every $1 you wager and receive your dollar back (i.e., the amount you wagered).

Decimal odds are shown as one number, which is the amount a winning bet would collect on a $1 bet. If the odds are listed as 6, a winning bet would receive $5 profit and the original $1 bet. Anything between 1 and 2 is a favorite bet and 2 is an even money bet.

Negative numbers signify the favorite on the betting line. The negative number indicates how much you'd need to bet to win $100. If the number is positive, you're looking at the underdog, and the number refers to the amount of money you'll win if you bet $100.

It's common for machine games to pay odds-for-1 because the game has already taken your bet before the roll takes place. On a table that pays 30-1, if you win your bet on 12, you keep your 1-unit bet and get 30 units in winnings, for a total of 31.

What does 1 to 2 odds mean? 1-2 Betting Odds means that out of 3 potential outcomes, the 1/2 odds are that there will be 1 of one kind of outcome and 2 of another kind of outcome. The 1-2 odds calculation means for every 3 betting events your selection should win 2 times and on 1 occasions the selection will not win.

20-1 Betting Odds means that out of 21 possible outcomes, the 20/1 odds are that there will be 20 of one kind of outcome and 1 of another kind of outcome. The 20-1 odds calculation means for every 21 betting events your selection should win 1 time and on 20 occasions the selection will not win.

The 9-1 betting odds probability is a 90.00 per cent probability of a particular outcome and a 10.00 per cent probability of another outcome. The 9/1 odds implied probability means your selection has a 10.00% chance of winning and a 90.00% chance the selection will lose.

If you are betting on a longshot NFL futures bet at odds of 40/1 (these fractional odds convert to +4000 in American odds; decimal odds of 41.00), your implied chance of success is 2%.

If the odds have a plus, that means you'll win that amount of money if you win the wager. For example, let's say the odds are -150. This means you'll have to wager $150 to get $100 on a winning bet. If the odds are +130, this means you'll win $130 if your bet of $100, or more, wins.

9-5 Betting Odds means that out of 14 potential outcomes, the 9/5 odds are that there will be 9 of one kind of outcome and 5 of another kind of outcome. The 9-5 odds calculation means for every 14 betting events your selection should win 5 times and on 9 occasions the selection will not win.

100-1 Betting Odds means that out of 101 possible outcomes, the 100/1 odds are that there will be 100 of one kind of outcome and 1 of another kind of outcome.

Odds expressed in terms of money, with $100 being the standard. If the odds are minus (–), then that amount of money must be wagered to win $100. (e.g. –150 means you must bet $150 to win $100.) If the odds are plus (+), that amount of money would be earned on a successful $100 wager.