How to Read Live Odds in American Format

What Do the Plus and Minus Signs Mean?

The sign is the first thing to look at. It tells you immediately whether you're looking at the favourite or the underdog.

• A minus sign (-) means that team or outcome is the favourite. The number tells you how much you need to bet to win $100.
• A plus sign (+) means that team or outcome is the underdog. The number tells you how much you'd win on a $100 bet.

That's the core of it. Everything else builds from there.

So if you see -150, you're looking at a favourite. You'd need to bet $150 to win $100. If you see +230, you're looking at an underdog. A $100 bet wins you $230.

Read More: Live Odds Explained: What They Are and How They Work

Want to make sure you're getting the best number? Check out our Live Odds page to compare lines across the hottest sportsbooks and maximise your EV before you place a bet.

How to Calculate Your Payout With American Odds

You don't need to bet exactly $100 for the math to work. Here's how to calculate what you'd win on any bet size.

For favourites (negative odds): Divide 100 by the absolute value of the odds, then multiply by your stake.

Example: -150 odds, $50 bet. 100 / 150 = 0.667. Multiply by $50 = $33.33 profit.

For underdogs (positive odds): Divide the odds by 100, then multiply by your stake.

Example: +230 odds, $50 bet. 230 / 100 = 2.3. Multiply by $50 = $115 profit.

You don't have to do this manually every time. Most sportsbooks show your potential payout in real time as you enter a stake. But knowing the formula helps you quickly judge whether a price is worth it before you tap the bet slip.

How to Read American Odds in a Live Betting Context

In live betting, the same numbers apply but they're moving. A favourite that opened at -200 pregame might drift to -120 if something unexpected happens early. An underdog sitting at +300 before kickoff might tighten to +140 after going up a goal.

Here's a quick way to read live American odds in real time:

• A negative number getting bigger (like -150 to -220) means the book thinks that outcome is becoming more likely
• A negative number getting smaller (like -220 to -130) means the probability is shifting away from that side
• A positive number getting smaller (like +300 to +160) means the underdog is becoming more likely in the book's model
• A positive number getting bigger (like +160 to +280) means the underdog is drifting and being priced as less likely

Watching how odds move tells you a story about what the market thinks is happening, even before you check the score.

Before locking in a live wager, see how the price stacks up across the market. Our Live Odds page lets you compare real-time lines in one place so you can squeeze out every edge.

What About Spreads and Totals?

On moneylines, one side is clearly the favourite and the other is the underdog. Spreads and totals work a bit differently.

On a standard spread or total, you'll often see both sides priced at -110. That doesn't mean both outcomes are favourites. It just means the book has set the line so that both sides require the same amount of risk to win $100. The -110 is the book's margin, not a statement about which side is more likely to cover.

In live betting, those spread and total prices can shift as the game progresses. If a lot of money comes in on one side, or if the game state makes one side significantly more attractive, you might see the price shift to -130 on one side and -90 on the other as the book adjusts.

Does a Bigger Number Always Mean Better Value?

Not automatically. A +400 underdog pays more than a +150 underdog, but that doesn't mean it's a better bet. The higher the positive number, the less likely the sportsbook thinks that outcome is.

Value comes from comparing what the odds imply to what you actually think the probability is. If you think an outcome has a 35% chance but the book is pricing it at +230, which implies around 30%, that's potentially a value bet. If you think it's closer to 20% and the book agrees, there's no edge there regardless of how big the payout looks.

Live markets move fast, but value still matters. Head to our Live Odds page to compare sportsbooks instantly and maximise your expected value on every in-play bet.

FAQ

What does -110 mean in American odds?

It means you need to bet $110 to win $100. It's the standard price on most spread and total bets and reflects the sportsbook's built-in margin.

Is a higher positive number always the underdog?

Yes. The bigger the positive number, the bigger the underdog and the bigger the payout if it wins.

Can American odds go below -100?

Technically yes, though it's uncommon. A price like -105 means you're risking $105 to win $100. You'll sometimes see this on reduced-juice sportsbooks.

Why do live American odds change so fast?

Because the game is producing new information constantly. Every play, every score, every minute off the clock shifts the probability, and the odds update to reflect that in near real time.

Do I need to bet $100 for these calculations to work?

No. The $100 reference is just a standard way to explain the format. You can bet any amount and scale the math accordingly.

How do I know if I'm getting a good live price?

Compare it across multiple sportsbooks. If one book is showing a noticeably better number than the others on the same outcome, that's a price worth acting on.