The bet, in one paragraph
A moneyline is the bet you place when you do not care how a game is won, only whether it is won. There is no spread, no handicap, no over-under. You pick a side. The price tells you what your stake must be relative to the prize. If you bet on the favorite, your stake is larger than the potential profit. If you bet on the underdog, the profit is larger than the stake. That is the entire mechanic. Everything else — vig, probability, hedge math, parlay compounding — is layered on top of those two simple positions.
The moneyline existed in American sportsbooks before the point spread was invented in the 1940s. It is the oldest active market and remains the dominant product in baseball, hockey, tennis, MMA, and most international soccer. In football and basketball the spread captured most of the handle, but the moneyline is still where the cleanest read of the market lives.
Reading the price
A US sportsbook posts moneylines as American odds. The price always references a $100 unit, never a percentage. A favorite at -180 requires you to risk $180 to win $100. An underdog at +150 wins $150 on a $100 risk. The size of the number tracks the favorite's strength: -110 is barely favored, -200 is solid, -500 is overwhelming, -1500 is almost certain.
Two conversions are worth committing to memory. American to decimal: -150 becomes 1.667 (your dollar back plus 66.7 cents profit); +200 becomes 3.00. American to implied probability: -150 implies 60%, +200 implies 33.3%. The implied probability number is the only one that matters for analysis. Once you can read a price as a probability, the entire market becomes legible.
What the price encodes
A moneyline price packages two things into a single number: the bookmaker's estimate of the true probability, and the bookmaker's margin. The customer cannot see them separately. A -110/-110 two-way moneyline is not a 50-50 market — it is a market the book believes is roughly 50-50, with a 4.55% commission tucked into the price on each side.
To recover the book's underlying probability estimate, you strip the vig. The standard multiplicative method divides each side's implied probability by the total overround. For a -110/-110 market, both sides drop from 52.4% to exactly 50.0%. For an asymmetric market — say -180/+155 — the implied probabilities are 64.3% and 39.2%, summing to 103.5%. Divide each by 1.035 and you recover the book's true estimate: 62.1% and 37.9%. The 3.5% gap is the price of admission.
Moneyline pricing across the major sports
Not every sport treats the moneyline the same way. Where it dominates, the line is sharp and liquidity is deep. Where it is a sidecar to the spread, books often misprice it relative to the headline market and a careful bettor can find soft prices.
| Sport | Moneyline role | Typical overround | Notes |
|---|---|---|---|
| NFL | Sidecar to spread | 104-106% | Liquid but spread carries volume |
| NBA | Sidecar to spread | 103-105% | Sharp on majors, soft on garbage-time game scripts |
| MLB | Primary market | 105-110% | Runline (1.5) liquidity thinner |
| NHL | Primary market | 105-108% | Puckline (1.5) priced steeply |
| Soccer 1X2 | Three-way primary | 104-108% | Draw is the trap — sharpest market in the world |
| Tennis | Pure moneyline | 103-107% | No spread; set-handicaps exist but illiquid |
| UFC / MMA | Pure moneyline | 106-112% | Method-of-victory props carry the wider vig |
| PGA outright | Futures-style moneyline | 115-140% | Long-tail field, huge embedded margin |
Why heavy favorites are usually bad bets
A -500 favorite implies an 83.3% win rate. After stripping a typical 4% vig, the book's true estimate is closer to 81%. Win 81 times out of 100 at -500 and you collect 81 × $20 = $1,620. Lose 19 times and you lose 19 × $100 = $1,900. Net: -$280 on $10,000 of action, even though you 'won' 81% of your bets. The break-even win rate for -500 is 83.3%, and shaving a few percent off that for vig pushes the break-even past 84% — a margin no public information can reliably beat across a season.
The behavioral problem is worse. Casual bettors view a -500 favorite as a 'lock' and bet larger on it than on plus-money sides, amplifying the loss when the upset arrives. The moneyline at -300 or worse is a market where books quietly profit because the price feels safe and the variance feels small — neither is true.
The plus-money underdog
The mirror of the heavy favorite is the plus-money underdog. Mathematically, a +250 underdog needs to win only 28.6% of the time to break even. Across a season of NFL upsets — which historically clock in around 32-34% for dogs in the +200 to +300 range — that price is roughly fair on average. The variance, however, is brutal: a 71% loss rate means losing streaks of seven or eight in a row are routine. Bankroll management matters more on plus-money bets than on any other moneyline price, because a single 1% of-bankroll stake can hide a six-figure psychological drawdown across a string of losses.
Sharps gravitate toward small dogs and pick'em moneylines (-110 to +110) where the book's margin is at its thinnest and the bettor's model edge has the most room to express itself. Recreational bettors gravitate to large favorites because they pay 'often.' The split is the structural reason books make money.
Line shopping the moneyline
The moneyline is the easiest market to line-shop because the prices are atomic — no half-point complications, no key-number stacking, just two numbers per game. A bettor with five US books open will routinely see 5-15 cent gaps on prices. Taking +145 instead of +130 on a small dog is not luck; it is the same outcome at a meaningfully better price. Across 200 bets per season, paying retail (a single book) versus paying wholesale (the best of five) is a 1.5-2.5% EV swing — larger than most modeling edges a recreational bettor can build.
The moneyline in three-way markets
European soccer prices a three-way moneyline — home win, draw, away win — and the draw is the most consistently mispriced of the three. Books and recreational bettors both under-price the draw because it 'feels' less likely than it is. Mathematically a draw is about 22-30% in most leagues; recreational books price draws like 18-22% to drive volume to home and away. Sharp soccer bettors live on the draw side.
The 'Draw No Bet' market is an alternative product where the stake is refunded on a draw. The pricing is effectively a synthetic two-way moneyline: home and away only, with the draw probability redistributed into both sides. It carries lower variance but worse expected value than the raw three-way market for bettors who can correctly price draws.
Where moneylines hide their true vig
Two pricing structures quietly inflate moneyline margin without the bettor seeing it. The first is the 20-cent line — the standard MLB convention where a -150 favorite faces a +130 underdog instead of the no-vig +150. The 20 cents is not just commission; it is the book's risk premium for the asymmetry of baseball variance (one starting pitcher can swing the line 40 cents in a day). The second is the boost, where a book moves a +180 underdog to +220 and brands it a 'Daily Boost.' These are almost always priced against a sharp-true price the book has already calculated; the 'free' lift is usually still negative expected value once the bonus terms and exclusions are added. A boosted line is not automatically a good bet, even when the price looks generous.
The moneyline as a market signal
Beyond the bet itself, moneyline movement is a sharp's most-watched indicator. A line that drifts from -130 to -155 between Tuesday and Friday in the NFL almost always reflects respected money on the favorite, not casual money. Casual money moves slower and tends to flow toward the spread side, not the moneyline. A late steam on the moneyline (a sudden 8-15 cent move minutes before kickoff) is one of the cleanest signals available to retail bettors that informed money has hit the book. The bettor cannot always follow the steam — by the time the move reaches them, the price is usually gone — but watching the moneyline is the cheapest way to learn how the market thinks.
Practical checklist for moneyline bettors
- Convert every price to implied probability before placing the bet. -150 means 60%, not '150 cents.'
- Strip the vig on two-way markets so you can compare the book's true estimate to your own.
- Line-shop ruthlessly — moneylines are the easiest market to shop across books.
- Size down on heavy favorites, not up. Variance is small but loss size dominates.
- Watch line movement across the week. Late moneyline steam is the cleanest sharp signal in retail markets.
- Avoid moneyline parlays of heavy favorites. Compounded vig is the bookmaker's most profitable product.
Sources & further reading
- Levitt, Steven D. "Why are gambling markets organised so differently from financial markets?" Economic Journal, 2004 — the foundational analysis of bookmaker pricing vs. exchange markets.
- Paul, Rodney J. & Weinbach, Andrew P. "Market efficiency and a profitable betting rule: Evidence from totals on professional football." Journal of Sports Economics, 2002 — recreational vs. sharp bettor behavior.
- American Gaming Association — "State of the States 2024" report on US legal sports wagering handle and hold data.
- Nevada Gaming Control Board — Monthly Sports Pool Win and Hold reports, 2018-2025.
- Pinnacle Betting Resources — public documentation on moneyline pricing, margin calculation, and bet-type conversion.