If you follow American sports like the NFL, NBA, or MLB, you’ll often come across moneyline odds. They’re the standard way of displaying odds in the United States, but for many British punters used to fractional or decimal odds, the format can look a bit puzzling at first. What does “+150” or “–200” actually mean? And how do these figures compare to the odds formats we use in the UK? This article breaks down how moneyline odds work, how to read them, and how to convert them into other formats.

What Are Moneyline Odds?

Moneyline odds show how much you can win on a straight bet on who will win a match — with no point spread or handicap involved. Unlike decimal odds, which show the total return including your stake, moneyline odds indicate either how much you’ll win from a £100 stake or how much you need to stake to win £100.

There are two types of moneyline odds:

• Positive odds (e.g. +150) – show how much profit you’ll make from a £100 stake. A line of +150 means you’d win £150 profit on a £100 bet (for a total return of £250).

• Negative odds (e.g. –200) – show how much you need to stake to win £100 profit. A line of –200 means you’d have to stake £200 to win £100 profit (for a total return of £300).

In short: positive odds represent the underdog, while negative odds represent the favourite.

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How to Read Moneyline Odds in Practice

Let’s take an example from the NFL:

• Kansas City Chiefs: –180
• Miami Dolphins: +160

Here, the Chiefs are favourites. You’d need to stake £180 to win £100 profit on them. The Dolphins are underdogs — a £100 bet on them would return £160 profit if they pull off the upset.

Moneyline odds make it easy to see which team the bookmaker expects to win and how strong that expectation is.

Converting Moneyline Odds to Decimal Odds

For British bettors more familiar with decimal odds, it’s useful to know how to convert moneyline odds. The formulas are straightforward:

• For positive odds: (moneyline / 100) + 1
• For negative odds: (100 / |moneyline|) + 1

Examples:

• +150 → (150 / 100) + 1 = 2.50
• –200 → (100 / 200) + 1 = 1.50

This allows you to compare odds across different formats and see where the best value lies.

Implied Probability: What the Odds Really Mean

Every set of odds reflects an implied probability — the bookmaker’s estimate of how likely an outcome is. You can calculate it from moneyline odds using these formulas:

• For positive odds: 100 / (moneyline + 100)
• For negative odds: |moneyline| / (|moneyline| + 100)

Examples:

• +150 → 100 / (150 + 100) = 40%
• –200 → 200 / (200 + 100) = 66.7%

So, a team priced at –200 is seen as having roughly a two-thirds chance of winning, while a team at +150 has about a 40% chance.

Moneyline vs Other Odds Formats

Different regions use different ways to display odds:

• Fractional odds – common in the UK (e.g. 5/2 or 1/4). Show profit relative to stake.
• Decimal odds – popular across Europe. Show total return per unit staked.
• Moneyline odds – standard in the US and Canada.

Although they look different, all formats express the same relationship between stake and potential return. Once you understand the logic behind moneyline odds, you can easily translate between formats and compare prices globally.

Pros and Cons of Moneyline Odds

Advantages:

• Clearly shows who is the favourite and who is the underdog.
• Widely used in American sports, making it easy to compare across US bookmakers.
• Simple for straightforward “who will win” bets.

Disadvantages:

• Can feel unintuitive for those used to fractional or decimal odds.
• Requires conversion to see exact returns in pounds.
• Less convenient for very short or very long prices.

Using Moneyline Odds Strategically

Once you understand how moneyline odds work, you can use them to identify value bets. Compare the bookmaker’s implied probability with your own assessment of the true likelihood. If you believe a team’s real chance of winning is higher than the odds suggest, the bet may offer value.

Example: A team is priced at +200 (implying a 33% chance), but you estimate their real chance at 40%. That difference could represent a value opportunity — provided your analysis is sound.

Conclusion: A Simple System Once You Get It

Moneyline odds might look confusing at first, but once you grasp the meaning of the plus and minus signs, the system becomes straightforward. It’s all about understanding how much you win or need to stake to win £100 — and how that reflects the probability of an outcome. With a bit of practice, you’ll be able to read and convert moneyline odds with ease, compare them to UK formats, and use them as a valuable tool in your betting strategy.