How to read odds

American odds look intimidating until you realize they are mostly just math wearing a football jacket.

Favorites and underdogs

Negative odds, like -150, usually indicate the favorite. Positive odds, like +130, usually indicate the underdog. The number tells you both the payout structure and the market's implied opinion.

What the number means

With negative odds, the number tells you how much you need to risk to win $100. With positive odds, the number tells you how much profit you would make on a $100 bet.

Decimal odds

Decimal odds show your total return for every $1 staked, including your original stake. So decimal odds of 2.50 mean a $10 bet returns $25 total, with $15 in profit. Many bettors find decimal odds cleaner because the math is less theatrical.

Implied probability

Implied probability is the win chance suggested by the odds. It is not a prophecy. It is the market's current pricing language.

American negative odds: probability = risk / (risk + 100)
American positive odds: probability = 100 / (odds + 100)
Decimal odds: probability = 1 / decimal odds

Examples:

-150 implies about 60.0%
+130 implies about 43.5%
2.50 implies about 40.0%

Why this matters

Reading the price correctly is the difference between understanding the bet and just nodding bravely at a screen full of numbers. Once you can move between American odds, decimal odds, and implied probability, you are a lot closer to understanding what the market is actually offering.