The first time you open a sportsbook app, the screen looks like a Bloomberg terminal. Numbers everywhere. Minus signs and plus signs in seemingly random places. Columns of fractions. A time deadline you do not understand.
Within an hour it all makes sense. Here is the hour.
The Three Lines You Will See On Every Game
Every major sports betting market has three standard bet types. Learn these three and you can navigate any sportsbook.
1. The Point Spread
The spread is the bookmaker's prediction of the winning margin, adjusted so that betting either side is theoretically even money.
Example:
Kansas City Chiefs -7 (-110)
Los Angeles Chargers +7 (-110)
This means: the Chiefs are 7-point favorites. If you bet the Chiefs, they must win by more than 7 for you to win. If you bet the Chargers, they can lose by up to 6 points and you still win. A 7-point Chiefs win is a push — your bet is refunded.
The (-110) is the juice (more on that in a moment).
Key concept: the spread is about the margin, not the winner.
2. The Moneyline
The moneyline is a straight bet on who wins the game. No spread, no handicap. The favorite costs more to bet; the underdog pays out more.
Example:
Kansas City Chiefs -320
Los Angeles Chargers +260
- To win $100 on the Chiefs, you must bet $320. A $320 bet returns $420 total ($100 profit).
- A $100 bet on the Chargers returns $360 total ($260 profit).
The moneyline number tells you the cost/payout. Negative = how much to bet to win $100. Positive = how much you win on a $100 bet.
3. The Total (Over/Under)
The total is the bookmaker's projected combined score for both teams. You bet whether the actual combined score goes over or under.
Example:
Over 47.5 (-110)
Under 47.5 (-110)
If the game ends 28-21, the combined score is 49 — the Over wins. Half-point totals (.5) eliminate pushes.
What Is The Juice (-110)?
The juice (also called vig or vigorish) is the bookmaker's cut.
At standard -110 odds, you must bet $110 to win $100. If two bettors place opposite bets at -110:
- One bets $110 on the favorite
- One bets $110 on the underdog
- Bookmaker collects $220 total, pays out $210 to the winner
- Bookmaker keeps $10 regardless of outcome
That $10 on a $220 action pool is roughly 4.5%. Over millions of bets, that is the profit margin.
This is why lines move. Books don't care who wins — they want balanced action on both sides. When too much money comes in on one side, they adjust the line to attract money to the other side.
Reading A Full Betting Screen
Here is what a typical NFL line looks like in full context:
SUNDAY 1:00 PM ET
Kansas City Chiefs -7 -110 -320
Los Angeles Chargers +7 -110 +260
Total: O/U 47.5 -110 / -110
Reading left to right:
- Team name
- Point spread (-7 or +7)
- Juice on the spread (-110 standard)
- Moneyline (-320 or +260)
The total appears below with its juice on each side.
Line Movement: What It Means When The Number Changes
When a line moves from -7 to -7.5, it means more money came in on the Chiefs than the Chargers. The book moved the line to make the Chargers more attractive.
Sharp movement (sudden line jump with low public volume) usually means professional bettors hit one side. Sharps are generally right.
Public movement (gradual drift in the direction of the popular team) is usually noise. Casual bettors overload favorites and popular teams. Books often profit from this.
When the spread moves opposite to public betting direction, that is a flag that sharp money is on the less popular side.
The Most Common Beginner Mistakes
Betting favorites because they are favorites. The spread already accounts for the expected gap. A -7 favorite winning by 6 is a losing bet.
Ignoring the juice. Parlays at -110 per leg seem attractive but the cumulative juice compounds quickly. A 4-leg parlay at -110 per leg only pays out correctly if each leg is at exactly 50% probability — your break-even win rate on each leg needs to be higher.
Chasing the line. If you see a number you like and wait, it will move away from you. When you like a number, take it.
Treating halftime lines as identical to full-game lines. Books reset odds at halftime with updated information. The logic that worked for your full-game analysis may not apply.
The One Number That Matters Most
Your win percentage on spread bets needs to exceed 52.4% to break even at -110 juice. That is the threshold.
Professional sports bettors who beat the market over time win at 53-55%. The margin is thin, the sample sizes needed to know if you are actually winning are enormous (1,000+ bets), and the books will limit or close your account if you consistently win.
Know this going in. Betting is entertainment with a built-in cost. The goal is to make that cost as small as possible by understanding the lines you are betting — not chasing, not tilting, and not pretending a 2-1 weekend run is a career trajectory.