How to Read Betting Odds

Odds do two jobs at once: they tell you how much a bet pays, and they tell you the probability the sportsbook is implying. Once you can read both, the rest of betting gets a lot clearer. Here is the plain-English version.

The three formats

American odds use a plus or minus. A minus number is the favorite and shows how much you must stake to win $100: -150 means risk $150 to win $100. A plus number is the underdog and shows the profit on a $100 stake: +150 means a $100 bet wins $150.

Decimal odds show your total return per $1 staked, including your stake back. 2.50 means a $1 bet returns $2.50 ($1.50 profit). Common outside the US and easy to compare across books.

Fractional odds show profit over stake. 3/2 means you win $3 for every $2 staked. Most common in the UK and horse racing.

They all describe the same thing; only the notation differs. An odds converter turns any one into the others in a second.

Turning odds into probability

The most useful skill is reading the probability the odds imply. For negative American odds, implied probability is odds divided by (odds + 100): -150 is 150 / 250 = 60%. For positive odds, it is 100 divided by (odds + 100): +150 is 100 / 250 = 40%.

Do this and you can compare the market's price to your own read. If you think a team wins more often than the odds imply, that is where value lives.

The vig, and why the numbers do not add to 100%

Add the implied probabilities of both sides of a market and you will get more than 100%. That extra is the vig (also called juice) — the sportsbook's built-in margin. On a standard -110 / -110 market, each side implies about 52.4%, for 104.8% total; the 4.8% is the vig. Beating the vig over time is the whole game, which is why the price you get on a bet matters as much as the pick.

Where Betvisors fits

Because the price matters, following someone whose record shows the odds they actually got is worth more than following a bare win-loss claim. On Betvisors, advisor records are platform-scored and unalterable, each pick keeps the entry odds it was posted at, and you only tip an advisor when a pick wins. Pair it with the free betting tools to check any number before you place it. See how it works.