In sports gambling, you bet money on the outcome of a game at set odds and win a payout if you are right. Sportsbooks make money through a built-in margin.
How it works
- You bet on an outcome at set odds.
- Odds show the payout: for example -110 means bet $110 to win $100.
- Common bets: moneyline, spread and over/under.
- Sportsbooks take a cut (vig), usually about 4.5%.
Legality
In the US, the 2018 Supreme Court case Murphy v. NCAA let states legalize it. Over 30 states now allow it.
Risks
Gambling addiction. Call 1-800-GAMBLER for help.
Tip
Set a budget and only bet what you can lose.
Types of bets
- Moneyline: bet on who will win the game.
- Point spread: the favorite must win by more than the spread, and the underdog can lose by less.
- Over/under (total): bet on whether the combined score is over or under a number.
- Parlay: combines multiple bets, with higher payout but all must win.
- Prop bets and futures.
Odds
American odds use plus and minus numbers. For example, minus 110 means you bet 110 dollars to win 100. Plus 150 means a 100 dollar bet wins 150.
The vig
Sportsbooks charge a commission called vig or juice built into odds. At minus 110 on both sides, a bettor needs to win about 52.4% of bets to break even.
Legality in the US
The Supreme Court struck down the federal ban (PASPA) in Murphy v. NCAA in 2018. As of 2024, sports betting is legal in around 38 states plus Washington, DC, though rules differ. Online betting is legal in about 30 states. Age requirements are typically 21.
Market size
Americans wagered over 119 billion dollars on sports in 2023, according to the American Gaming Association.
Risks
- Most bettors lose money over time.
- Gambling disorder affects an estimated 1% to 2% of adults, and is related to debt, relationship problems and mental health issues.
- Chasing losses is a common pattern.
Responsible gambling
Set limits, bet only what you can afford to lose, never borrow, use deposit limits and self-exclusion tools, and take breaks.
Taxes
Winnings are taxable income in the US.
Help
The National Problem Gambling Helpline is 1-800-GAMBLER (1-800-426-2537), available 24/7 and free.
Money flow and market growth
In the US, the Supreme Court struck down the federal ban in Murphy v. NCAA in May 2018, allowing states to legalize sports betting. By 2024 more than 30 states and Washington DC had legal betting. The American Gaming Association reported roughly 150 billion USD wagered legally in 2023. Sportsbooks make money through the margin built into odds, usually about 4.5 percent on standard 110 lines.
Reading odds
American odds of minus 110 mean you stake 110 USD to win 100 USD, implying about 52.4 percent probability. Plus 200 means a 100 USD stake wins 200 USD, implying 33.3 percent. Parlays multiply odds but also multiply risk, so the house edge grows with each leg. Winnings are taxable income in the United States. The National Problem Gambling Helpline is 1-800-GAMBLER (1-800-426-2537).
Based on data from the American Gaming Association and the National Council on Problem Gambling
