Learn how to read betting lines in minutes. Moneyline, point spread, and over/under totals explained with real numeric examples — plus what the + and − signs actually mean.
You open your app and see this line:
Kansas City Chiefs -3.5 (-110) vs. Philadelphia Eagles +3.5 (-110)
That one row hides three separate markets — the moneyline, the point spread, and the over/under total. Here is how to read every part of a betting line in about two minutes.
Here are betting lines explained in one sentence: a betting line is the set of prices a sportsbook posts on a game, packing three separate bets — the moneyline (who wins), the point spread (the margin of victory), and the total or over/under (combined score) — into a single row of American odds. Read the sign first (− for the favorite, + for the underdog), then the number (how much you risk or win per $100), and finally the spread or total attached to it. The rest of this guide breaks down each market with real numbers.
Every betting line uses American odds format. The sign in front of the number is your first clue:
Think of it this way: negative means you pay more to win less (the book expects this outcome). Positive means you pay less to win more (the book thinks this is less likely).
The moneyline is the simplest bet: pick who wins, straight up, no spread. It is priced entirely by the sign and number.
Example — Lakers -180 vs. Celtics +160:
The favorite pays less because they are more likely to win; the underdog pays more because they are less likely to. That is the entire idea behind moneyline odds.
Tip: Skip the math — calculate your moneyline payout by entering any odds and stake. The Single Bet Calculator shows your profit, total return, and implied probability instantly.
The point spread levels the matchup between two unevenly matched teams. In our headline example:
The half-point (3.5 instead of 3) eliminates pushes — there is no tie. You either win or lose the bet.
Real scenario: If the Chiefs win 27-24 (a 3-point margin), a bet on Chiefs -3.5 loses because they did not cover. A bet on Eagles +3.5 wins because the Eagles lost by fewer than 3.5 points.
Both sides of a spread are usually priced at -110 — that price is the vig, explained below.
The total, or over/under, is a bet on the combined score of both teams — not who wins. The book posts a number and you bet whether the real total lands above or below it.
Example — Total 47.5 (Over -110 / Under -110):
If the final score is 27-24, that is 51 combined points — Over wins. If it is 20-17 (37 points), Under wins. The half-point again guarantees there is no push. Totals are priced in the same American odds as everything else, so -110 means you risk $110 to win $100.
Here are all three markets from one game — Chiefs vs. Eagles — side by side, so you can see how a single betting line splits into three different bets:
| Market | What you bet on | Example line | Your bet wins when |
|---|---|---|---|
| Moneyline | Who wins outright | Chiefs -180 / Eagles +160 | Your team wins the game, any margin |
| Point spread | Margin of victory | Chiefs -3.5 / Eagles +3.5 (-110) | Chiefs win by 4+ or Eagles win or lose by ≤3 |
| Total (over/under) | Combined points | Over / Under 47.5 (-110) | The combined score lands on your side of 47.5 |
Read across each row: the moneyline ignores the margin, the spread is all about the margin, and the total ignores who wins entirely. Every full betting line you see is just these three markets stacked in one row.
"Vegas line" is just sportsbook shorthand for the full line a book offers on a game. Reading a Vegas line means reading all three markets in one row. A typical full listing looks like this:
Chiefs -3.5 (-110) · ML -180 · Total 47.5 (O/U -110)
Once you can read the sign, the spread, the moneyline, and the total, you can read any Vegas line on the board — every sportsbook lists the same three markets in the same order.
Notice both sides of the spread and total are priced at -110. That is the vig (short for vigorish) or juice — the sportsbook's built-in fee.
At -110, you risk $110 to win $100. Add up the implied probabilities and you see the book's edge:
That 4.76% above 100% is the sportsbook's profit margin. Your break-even win rate at -110 is 52.38% — you need to win more than half your bets just to cover the vig.
Tip: Want the fair price with the juice stripped out? Calculate the vig on any line with the No-Vig Calculator — paste both sides and it shows the true no-vig fair odds instantly.
Tip: Not all sportsbooks charge the same juice. Some offer -105 on spreads. Shopping lines across 2-3 books is the simplest way to cut the vig you pay over time. Even a small difference from -110 to -105 adds up over hundreds of bets.
When you see Chiefs -3.5 (-110), you now know three things:
Enter -110 into the Single Bet Calculator with your usual stake and see the exact payout. Then use the Odds Converter to see that -110 equals 1.909 decimal, 10/11 fractional, and 52.38% implied probability.
For a deeper look at how the vig works and how to remove it, see the No-Vig Calculator guide.
The sign marks favorite vs. underdog. A minus (−150) is the favorite — you risk $150 to win $100. A plus (+130) is the underdog — a $100 bet wins $130. The bigger the number, the heavier the favorite or the longer the underdog.
A betting line packs up to three markets into one row: the moneyline (who wins), the point spread (the margin of victory), and the total or over/under (combined score). Each is priced in American odds, and both sides usually carry −110 vig.
A negative number (like -150) means that team is the favorite. You risk that amount to win $100 profit. -150 means risk $150 to win $100.
A positive number (like +130) means that team is the underdog. A $100 bet wins $130 profit.
The spread is a margin of victory the favorite must exceed. If a team is -3.5, they must win by 4 or more for a bet on them to pay out.
The vig is the sportsbook's fee built into the odds. Standard juice on spread bets is -110, meaning you risk $110 to win $100.