Sports Betting 101
Your complete introduction to betting on sports.
Sports betting is the act of wagering money on the outcome of a sporting event through a licensed sportsbook. Bettors pick winners (moneyline), predict margins (spreads), or forecast totals (over/under), with payouts determined by the odds at the time the bet is placed. Understanding how sportsbooks set odds, collect their commission (the vig), and balance action is essential before placing your first bet.
How Sportsbooks Work
Sportsbooks are businesses. Their goal isn't to predict winners—it's to balance action on both sides and profit from the "vig" (vigorish or juice).
If equal money is bet on both sides, the sportsbook keeps ~4.5% regardless of outcome.
Strategy Insight
The Three Main Bet Types
1. Moneyline
Simply pick who wins. Odds reflect implied probability:
- Favorite (-150) – Bet $150 to win $100
- Underdog (+130) – Bet $100 to win $130
Good to Know
2. Point Spread
Bet on the margin of victory:
- Patriots -7 – Must win by more than 7 points
- Jets +7 – Can lose by up to 6 points and still win
3. Totals (Over/Under)
Bet on combined score of both teams:
- Over 47.5 – Bet combined score exceeds 47
- Under 47.5 – Bet combined score is 47 or less
Reading Odds Formats
Odds Format Comparison
| American | Decimal | Fractional | Win Probability |
|---|---|---|---|
| -200 | 1.50 | 1/2 | 66.7% |
| -150 | 1.67 | 2/3 | 60% |
| +100 | 2.00 | 1/1 | 50% |
| +150 | 2.50 | 3/2 | 40% |
| +200 | 3.00 | 2/1 | 33.3% |
Lower American odds (more negative) = higher implied probability
Good to Know
Use our Universal Bet Calculator to convert between American, decimal, and fractional odds instantly.
Key Terms
- Action – Having a bet in play
- Against the Spread (ATS) – Betting with handicap
- Cover – Winning against the spread
- Handle – Total amount wagered
- Juice/Vig – The sportsbook's commission
- Line Movement – When odds change
- Push – Tie, bet is refunded
- Sharp – Professional bettor
- Square – Recreational bettor
Bankroll Management for Sports
Professional sports bettors typically:
- Bet 1-3% of bankroll per wager
- Never chase losses with larger bets
- Keep detailed records of every bet
- Judge success over months, not weeks
Warning
The Path to Profitability
Breaking even requires winning about 52.4% at -110 odds. Consistent profitability requires:
- Finding value (lines mispriced by 2%+ in your favor)
- Shopping multiple books for best lines
- Specializing in specific sports/leagues
- Disciplined bankroll management
- Avoiding emotional betting
Strategy Insight
Sources & References
- Break-even win rate at −110 (52.38%) — mathematical derivation: 100 ÷ (100 + 110) × 100 = 52.38%. Independently verifiable.
- Kelly, J.L. Jr. (1956). “A New Interpretation of Information Rate.” Bell System Technical Journal, 35(4), 917–926. Foundational paper for optimal bet-sizing theory; the 1–3% per wager guideline reflects a conservative fractional-Kelly approach.
- American Gaming Association (AGA). State of the States: The AGA Survey of the Commercial Casino Industry. Published annually at aga.org. Referenced for US legal sports betting market context.
- BonusBell platform analysis — vig ranges and win-rate benchmarks derived from analysis of 220+ tracked sportsbooks as of February 2026.
Mathematical claims are independently verifiable derivations. BonusBell platform analysis reflects data from 220+ tracked platforms as of February 2026.
Key Takeaways
- 1Sportsbooks profit from the vig, not by predicting winners
- 2Three main bet types: Moneyline, Spread, and Totals
- 3Shop multiple books for the best lines/lowest vig
- 4Bet 1-3% of bankroll per wager; expect losing streaks
- 5Profitable betting requires finding value, not just picking winners