basics · lines
How to read a betting line
Spreads, totals, moneylines and the juice — what each number means and what it's quietly telling you about the market.
· 6 min read
Every game card shows three markets. They look like three unrelated numbers, but they are three views of the same opinion: the market's best guess at how the game goes, priced so the book makes money either way.
The spread
DET +4.5 (-110) means Detroit is the underdog by four and a half points. Bet Detroit and you win if they win outright or lose by four or fewer. Bet the other side, BUF -4.5, and Buffalo has to win by five or more.
The half point exists so there is no tie. When a spread is a whole number and the game lands exactly on it, the bet is a push and your stake comes back.
The number in brackets is the price. -110 means you risk 110 to win 100. That extra ten is the book's margin, usually called the juice or vig.
The total
O 54.5 (-110) is a bet that both teams combined score 55 or more; U 54.5 is a bet on 54 or fewer. Totals don't care who wins. They care about pace, efficiency, weather and how each defense holds up, which is why they move on news that would never touch the spread.
The moneyline
DET +194 and BUF -238 are bets on who wins, no points involved. The numbers are prices, not margins:
- A positive number is what you win on a 100 stake.
+194pays 194 on 100. - A negative number is what you risk to win 100.
-238means you put up 238 to win 100.
Moneylines convert to implied probabilities, and this is where the market shows its hand:
| Price | Implied probability |
|---|---|
| +194 | 34.0% |
| -238 | 70.4% |
Those add up to more than 100%. The gap, about 4.4 points here, is the juice again, spread across both sides.
The juice is the whole game
Because of the margin, a bettor at -110 has to win 52.4% of the time just to break even. That single number explains most of what a research tool is for. Picking winners is easy; almost everyone picks winners more than half the time. Picking them at a rate that clears the juice, over hundreds of bets, is the skill.
What the line is telling you
A few habits that make a line easier to read:
- Compare the open and the close. A spread that opens at 3 and closes at 4.5 moved because informed money came in on the favourite, or because news changed the matchup. The direction matters more than the size.
- Look across books. If one book is half a point better than the rest, that's free margin. Line shopping is the only edge that never stops working.
- Treat the total as its own game. Weather, injuries to a defense, a change at quarterback: these hit the total first.
- Convert to probability. A price is a claim about likelihood. Once you see
-238as "the market thinks 70%", you can ask the only useful question: do I have a reason to think otherwise?
That last question is what a model is for. It doesn't know the future either. It just answers with a number you can compare to the market's number, and refuses to answer when the two are too close to call.