What Is a Moneyline Bet? Moneyline Betting Explained

A moneyline bet picks the winner and nothing else. No points are added, no handicap is subtracted, and the final margin is irrelevant: win by 1 or win by 40 and the bet pays the same. That leaves the price doing all of the work, which makes the moneyline the cleanest place in betting to learn what a price actually is.

Here is the part most guides skip. Because the handicap is zero, a moneyline price is a probability with a dollar sign taped to the front. Read it that way and the two questions everyone asks, what does +150 mean and should I take the moneyline or the spread, both turn into arithmetic.

Try It: Moneyline or Spread?

Type the two moneyline prices and the two spread prices from the same game. The widget devigs each market, then shows you a number neither price displays on its own: the chance the favorite wins but fails to cover.

Those fair prices are not a re-creation. They come from devigProbabilities, the same function SmartStake prices a real bet with, so the widget cannot drift from what the product would tell you. The devigging guide covers the method itself, and the devigging calculator runs it on any market you paste in.

What Is a Moneyline Bet?

A moneyline is a bet on which team wins the game outright. That is the whole market. There is no line to cover and no total to clear, so the only question is who ends up ahead.

Compare it to its two neighbours and the difference is obvious:

Because the moneyline asks the simplest possible question, it carries the least ambiguity and the most price movement. A team that goes from a coin flip to a strong favorite barely moves a spread by three points, and its moneyline can travel from −110 to −250.

What Does +150 Mean in Betting?

+150 means you risk 100 to win 150. Stake $100 and a winner returns $250 in total, your $100 stake back plus $150 of winnings.

The sign tells you the side. A plus price is the underdog on that market, a minus price is the favorite. A price of −150 flips the sentence: you risk 150 to win 100.

But the number is doing something more useful than describing a payout. It states a probability:

• Positive price $+A$: implied probability $= \frac{100}{A + 100}$. So +150 implies $\frac{100}{250} = 40\%$.
• Negative price $-A$: implied probability $= \frac{A}{A + 100}$. So −150 implies $\frac{150}{250} = 60\%$.

Those two add to 100%, which is the giveaway that this particular pair is priced without any margin. Real boards never are, and the gap is the whole subject of the next few sections. If American odds are new, the betting odds converter guide and the odds converter tool turn any price into decimal, fractional, or a straight percentage, and the implied probability calculator does the last step on its own.

Moneyline Meaning: The Price Is the Probability

On a spread you get two pieces of information, the handicap and the price, and they answer different questions. The handicap says what has to happen. The price says what it pays.

A moneyline hands you only the second one. With the handicap fixed at zero, the price is carrying the entire opinion of the market. That is why a moneyline is the best market to practise on: every move in the number is a move in what the market thinks is going to happen, with nothing else mixed in.

Run the default game through it. The favorite is −340, which implies $\frac{340}{440} = 77.27\%$. The underdog is +270, which implies $\frac{100}{370} = 27.03\%$. Add them and you get 104.30%, not 100%.

That extra 4.30% is the overround, the margin baked into the pair. Strip it out and the honest numbers are 74.09% and 25.91%, which price at −286 and +286. How sportsbooks make money works through where that margin comes from, and no vig fair odds covers what the stripped number does and does not mean.

A Moneyline Is a Spread of Zero

Here is the reframe that makes everything else on this page work. A moneyline is the spread market with the handicap set to zero. Same bet, same settlement rule, one fewer number.

You can watch it settle. Drag the spread below to any value and it behaves like a normal spread. It starts at 0, which is a moneyline: the requirement reads "Win by 1 or more", the note underneath says a draw pushes, and the default 24 to 24 game returns your stake.

That verdict comes from gradeHandicap, the rule the SmartStake bet tracker settles a real spread with. Add the line to your margin and read the sign: positive wins, negative loses, zero pushes. At a line of 0 that reduces to reading the margin itself.

The product does not actually route a moneyline through that function. It grades one categorically, by comparing the winning side's token to the side you picked, which is a different code path entirely. The two paths agree anyway, because every sport resolver SmartStake ships (football, basketball, baseball, hockey, tennis, soccer) grades a tie on the moneyline as a push, which is exactly what a spread of zero returns on a zero margin. The identity survives contact with the settlement layer, not just the math.

The Band Between the Moneyline and the Spread

Now the useful part, and the thing no other moneyline page will tell you.

The moneyline and the spread on one game are two prices on the same underlying distribution, sliced in two different places. The moneyline slices it at 0. The spread slices it at 7.5. So devig both, subtract, and you get the probability of the strip in between: the favorite wins, but by less than the number.

Take the default game. The moneyline devigs to a 74.09% chance the favorite wins. The −7.5 spread priced −110 on both sides devigs to a clean 50.00% chance the favorite covers. Subtract:

The market is telling you that roughly a quarter of the time, this favorite wins the game and still loses the spread bet. Neither price displays that number. It only exists once you read the two markets against each other.

Here is the same subtraction across the spreads you actually see on a board, each moneyline paired with a realistic price:

The band grows with the spread, which is intuitive once you see it: the wider the handicap, the more room there is between winning and covering.

One thing worth checking before you lean on a number like that is whether it survives the choice of devig method, since there are four and they disagree on lopsided markets. On this one they barely move. The band comes out at 24.09% under multiplicative, 25.12% under additive, 25.68% under power and 25.17% under probit, a spread of 1.59 points across all four. That is the opposite of what happens on a lopsided player prop, where the method choice can swing the fair price 15 points, and it is why the band is a number you can lean on.

Moneyline or Spread? The Answer Is Not the One You Have Heard

The usual advice is a rule of thumb: back big favorites on the spread, back underdogs on the moneyline. It sounds sensible and it is not derived from anything.

Here is the derivation. Take a stake of 1 at decimal odds $o$ on an outcome with true probability $p$. The expected result is $p \cdot o - 1$. So comparing the moneyline against the spread on the same game is comparing $w \cdot o_m$ against $c \cdot o_s$, where $w$ is the fair chance of winning outright and $c$ the fair chance of covering.

Now use the fair probabilities that came out of each market's own devig. Under the proportional method, $w = \frac{1/o_m}{S_m}$ where $S_m$ is that market's summed implied probability, so:

Each bet's expected result is exactly minus its own market's hold. The payout cancels. The win probability cancels. The points cancel. Nothing survives except how expensive the market is.

So the honest answer to "moneyline or spread" is this: with no opinion beyond what the board already says, take whichever of the two markets is cheaper, and nothing else enters the decision. On the default game the moneyline market keeps 4.12% and the spread market keeps 4.55%, so the moneyline is the better buy by 0.42 points, and the reason has nothing to do with it being a big favorite.

That is also why line shopping does more for a moneyline bettor than any rule of thumb about favorites. The cheapest version of the market is the whole game.

When Your Own Opinion Changes the Answer

The moment you have a view of your own, the cancellation stops and the choice becomes real. What matters is where your view differs from the market, and on these two bets there is only one place it can: the band. That strip of outcomes is the only thing the two bets do not share, so an opinion that moves the choice has to be an opinion about it.

You can solve for the exact tipping point. Prefer the moneyline while $w \cdot o_m > (w - b) \cdot o_s$, where $b$ is the band, and rearranging gives:

On the default game that is $\frac{0.2409 \times 1.9091}{1.9091 - 1.2941} = 74.77\%$, against a market fair price of 74.09%. So the moneyline is the better buy right up until you think this favorite wins outright more than 74.77% of the time. Past that, the spread takes over.

Read that direction twice, because it is backwards from the folk rule. The more confident you are in a favorite, the more you should want the spread, since the extra payout compounds faster than the band costs you. Conviction pushes you toward the harder bet, not the safer one.

That is also the shape of a real edge. You are not betting "this team is good", you are betting a specific probability against a specific price, which is what positive EV betting formalises and what the expected value calculator prices for a single bet.

When the Two Prices Contradict Each Other

The band has a floor, and it makes a useful stale-line detector.

A favorite that covers a spread has always also won the game outright. Covering is a subset of winning, so the fair chance of covering can never exceed the fair chance of winning:

If you devig both markets and the band comes out negative, the two prices are describing games that cannot both exist, and one of them has not been updated. The widget above flags it.

Work out where that bites. Hold the spread at −7.5 priced −110 on both sides, so the fair cover chance is 50.00%. Sweep the moneyline favorite and the fair win probability crosses below 50% at about −108. So a favorite laying 7.5 points cannot be priced shorter than roughly −108 on the moneyline without the two markets contradicting each other, no matter how the book feels about the game.

That is a cheap check to run and it points at the same thing a stale price always points at: the market you are looking at has moved and this one has not. Watching prices across books at once is what the Odds Screen is for, and disagreements that persist are what the arbitrage finder and middles are built on.

Why the Underdog Pays a Bigger Margin

One asymmetry deserves naming, because it changes what a moneyline costs depending on which side you take.

The margin built into a price is not flat across the board. It rises with the length of the price, an effect known as favorite longshot bias. SmartStake models it directly: when only one side of a market is quoted, the closing line devig assumes a hold that scales with the odds, running about 4.18% on a −500 favorite up to about 6.83% on a +1000 longshot.

On the default game that assumption puts about 4.32% on the −340 favorite and about 5.93% on the +270 underdog. Same game, same board, and the underdog side is the more expensive one to buy. How sportsbooks make money derives that curve and what it does to long prices generally.

The practical read: long moneyline prices are where shopping pays most, because that is where the margin is thickest and where books disagree most.

Moneylines Across Sports

The market is identical everywhere. What changes is how useful it is.

• NFL and NBA: scores are high and margins are wide, so the spread carries most of the action and moneylines on big favorites get very short.
• MLB and NHL: low scoring, so the handicap is fixed at 1.5 runs or goals and the moneyline is the main market. The run line calculator guide prices the trade between the two in baseball.
• Tennis and other head to head sports: there is no spread to speak of, so the moneyline is the market.
• Soccer: covered below, because it is the one genuine exception.

The One Place the Spread of Zero Breaks

Soccer draws often, and a draw is not a tie in the American sense. It is a third priced outcome, sold as its own selection alongside the two teams, which makes the market three way rather than two way.

Two things follow. The devig has to normalise across three prices rather than two, so every calculation on this page takes a third input. And "a moneyline is a spread of zero" stops being true, because a spread of zero pushes on a level game while a three way market pays the person who backed the draw.

Sportsbooks solve it by selling a separate two way market called draw no bet, which refunds every stake if the game ends level. That is the moneyline shape restored, with the draw removed rather than priced, and it is the only moneyline shaped soccer market in SmartStake's grading layer for exactly that reason.

What the Price Costs You

One last framing that ties the page together. On the default game, $100 on the spread pays $90.91 if it covers. The same $100 on the moneyline pays $29.41 if the favorite wins.

You are giving up $61.50 of upside to buy 24.09 percentage points of extra chances to collect. Whether that trade is worth taking is not a matter of taste. It is the comparison in the two sections above, and both of them come down to a price against a probability.

That is the habit worth taking away from the moneyline market generally: it is the market where the price and the probability are the same object, so it is the easiest place to build the reflex of checking one against the other. Closing line value is what tells you afterwards whether the reflex was working.

Frequently Asked Questions

What is a moneyline bet? A moneyline bet is a wager on which team wins the game outright, with no points added or subtracted. The margin does not matter. A one point win and a forty point win pay exactly the same. Because no handicap is attached, the entire price carries the information, and that price is just a probability written in betting notation.

What does +150 mean in betting? A price of +150 means you risk 100 to win 150, so a $100 bet returns $250 in total. It also states a probability. A positive American price of $+A$ implies $\frac{100}{A+100}$, so +150 implies 40%. Anything with a plus sign in front of it is the underdog on that market.

What happens to a moneyline bet if the game ties? In the sports SmartStake grades, a tie pushes the moneyline and your stake comes back, which is exactly what a spread of zero does. Soccer is the exception, because a draw is a third priced outcome rather than a tie, so a two way soccer market is usually sold as draw no bet, which refunds on the draw and removes it from the bet.

Is the moneyline or the spread the better bet? If you have no opinion beyond what the board already says, the better bet is simply whichever of the two markets is cheaper, because pricing each bet against its own market makes its expected result equal to minus that market's hold. The payout, the win probability and the points all cancel out. On the worked example above the moneyline market keeps 4.12% against the spread market's 4.55%, so the moneyline is the cheaper buy by 0.42 points.

Why do big favorites have such bad moneyline odds? Two things stack up. A short price pays little by construction, because a team that wins 80% of the time can only ever pay around 25 cents on the dollar at a fair price. On top of that the margin built into a price is not flat: SmartStake's own single sided model assumes about 4.18% on a −500 favorite and about 6.83% on a +1000 longshot, so the side you take changes what the margin costs you.

Can the moneyline and the spread on one game contradict each other? Yes, and it is worth checking. A favorite that covers has always also won, so the fair chance of covering can never exceed the fair chance of winning outright. Devig both markets and compare. Against a −7.5 spread priced −110 on both sides, a moneyline favorite shorter than about −108 makes the cover look likelier than the win, which is impossible, so one of the two prices is stale.

Betting Moneylines at Better Prices

The moneyline rewards one habit above all others, and it is the cheapest one to build: read every price as a probability, then check that probability against the best number available anywhere.

Start by pasting a moneyline into the devigging calculator and seeing what the market really thinks. Compare prices across books on the Odds Screen. When you want the comparison run for you, the positive EV tool does exactly this against a sharp reference and surfaces the prices that are out of line.

None of this makes a bet safe. A well priced bet can still lose, and a badly priced one can still win. What reading the price as a probability changes is whether you know which one you took.

References

• SmartStake devigging math, devigProbabilities and probabilitiesToFairOdds, the functions behind every fair price on this page.
• SmartStake spread grading, gradeHandicap, the rule the bet tracker settles a spread with, and the moneyline grading path in the box score layer.
• SmartStake single sided hold model, assumedSingleSidedOverround, the odds scaled margin assumption quoted in the favorite longshot section.
• Joseph Buchdahl, Squares and Sharps, Suckers and Sharks, on favorite longshot bias and margin structure.