Sports betting 101 starts with one idea: every set of odds is a price, and the price tells you how often you must win to break even. This guide covers how odds, moneylines, point spreads, totals and parlays work, how big a bet should be, what the law says about offshore sportsbooks, and a simple plan for your first week. Each term gets a plain definition the first time it appears.
By Jake Mercer, Lead Sports Betting Analyst. Last updated: October 15, 2026.
The Quick Version
- Odds are a price. Minus odds (like -150) mark the favorite and show what you risk to win $100. Plus odds (like +130) mark the underdog and show what you win on $100.
- Every price hides a break-even win rate. At the standard -110 you must win 52.4% of your bets just to break even.
- Three core bets cover most of what you will see. A moneyline picks the winner. A spread gives one team a head start. A total is over or under the combined score.
- Parlays multiply your result, good or bad. If each leg is a coin flip priced at -110, a 3-leg parlay loses about $13 per $100 risked on average, versus $4.55 on a single bet.
- Offshore books are not licensed by any U.S. state. Federal law mostly targets operators, not ordinary bettors, but regulators call these sites illegal and you have no recourse if a payout is withheld.
- Our take: spend your first week mostly on paper bets, cap real money at 5 small units, and write down every price.
What Do Betting Odds Actually Mean?
Odds show two things at once: how much you win if the bet hits, and how likely the sportsbook thinks the outcome is. Most U.S. sportsbooks use American odds, which look like -150 or +200. A minus number is the favorite and tells you how much you must risk to win $100. A plus number is the underdog and tells you how much you win if you risk $100.
Here is a made-up game. The Chiefs are -150 and the Raiders are +130. A $10 bet on the Chiefs wins $6.67 in profit if Kansas City wins ($10 x 100 / 150). A $10 bet on the Raiders wins $13.00 in profit if Las Vegas wins ($10 x 130 / 100). The bet size can be anything. The ratio does not change.
Every price also has a break-even win rate. For minus odds, it is the number divided by that number plus 100. For plus odds, it is 100 divided by the number plus 100. This table shows the math for seven common prices:
| Odds | Profit on a $10 bet | Break-even math | Win rate needed |
|---|---|---|---|
| -300 | $3.33 | 300 / (300 + 100) | 75.0% |
| -200 | $5.00 | 200 / (200 + 100) | 66.7% |
| -150 | $6.67 | 150 / (150 + 100) | 60.0% |
| -110 | $9.09 | 110 / (110 + 100) | 52.4% |
| +100 | $10.00 | 100 / (100 + 100) | 50.0% |
| +150 | $15.00 | 100 / (150 + 100) | 40.0% |
| +300 | $30.00 | 100 / (300 + 100) | 25.0% |
Read the last column as a hurdle. A -200 favorite must win two out of three bets before you make a dime. A +300 underdog only needs to win one out of four. Neither is “better.” They are different prices for different chances, and your job is to judge whether the real chance is higher than the hurdle.
What Is a Moneyline Bet?
A moneyline bet is a pick on who wins the game. No spread, no margin. The favorite pays less and the underdog pays more. It is the main bet in baseball, hockey and soccer, where final scores are close. If you want to see one placed step by step, read our guide to how to place a moneyline bet.
What Is a Point Spread?
A point spread is a handicap that makes a lopsided game close to a coin flip. The favorite gets a minus number and must win by more than that number. The underdog gets a plus number and can lose by less than that number, or win, and still cash. Here is a made-up board:
| Team | Spread | Price |
|---|---|---|
| Seahawks (favorite) | -5 | -110 |
| Eagles (underdog) | +5 | -110 |
A Seahawks bet wins only if Seattle wins by 6 or more. An Eagles bet wins if Philadelphia wins or loses by 4 or fewer. If Seattle wins by exactly 5, the bet is a push. A push means nobody wins and your stake comes back. A half point, like -5.5, removes the push. Our full guide to the NFL point spread and over/under explains why the numbers 3 and 7 matter so much and how to compare the price at two books.
What Is a Total (Over/Under)?
A total is a bet on the combined score of both teams, and it ignores who wins. If the total is 48.5, the Over needs 49 or more points and the Under needs 48 or fewer. The half point exists so one side always wins. A whole-number total, like 48, can push.
What Is a Parlay, and Why Is It Harder Than It Looks?
A parlay ties two or more bets into one ticket. Every leg must win. One miss and the whole ticket loses. The payout is bigger because the risk is bigger. Here is the math on a made-up 3-leg ticket: Chiefs moneyline at -180, Seahawks -5 at -110, and Over 48.5 at -110. Convert each price to a payout multiplier (stake included): -180 pays 1.556x, and -110 pays 1.909x. Multiply them: 1.556 x 1.909 x 1.909 = 5.67. A $10 ticket returns $56.69 if all three hit, which is $46.69 in profit. Miss one and you lose the $10.
Here is the part most beginners never see. If every leg is a true coin flip priced at -110, a single bet loses 4.55 cents per dollar risked on average. Two legs lose 8.9 cents. Three legs lose 13.0 cents. Six legs lose 24.4 cents. The fee on each leg compounds. The same multiplication works in your favor only if you really win more than 52.4% of your legs. At 55% per leg, a 3-leg parlay earns +15.8 cents per dollar. Parlays multiply whatever edge you bring. Until you can show an edge in your logged bets, assume you have none.
Before you build one, run the numbers in our parlay payout calculator. Then read what a parlay bet is and when beginners should try one and our warning on the same-game parlay, where the legs often depend on each other.
What Are Prop Bets and Futures?
A prop bet (short for proposition) is a bet on something that happens inside a game, such as a player’s passing yards or whether the game goes to overtime. A futures bet is a bet on something decided later, such as a Super Bowl winner or a season win total. You lock in the price when you bet, and futures prices move as the season changes. Compare prices at more than one book before you bet on either.
What Is the Juice, and How Does a Sportsbook Make Money?
Juice, also called vig or vigorish, is the fee built into the price. At -110 on both sides of a spread, a book that takes $110 from each side collects $220. It pays the winner $210 ($110 stake plus $100 profit) and keeps $10. That is 4.5% of the money wagered ($10 / $220). You can see the same fee in a moneyline. At -180 and +155, the break-even rates are 64.3% and 39.2%, which add to 103.5%. Anything above 100% is the book’s margin. Shopping for the best price at a second book is the easiest way to cut it.
How Much Should a Beginner Bet?
Pick one pot of money you can lose without changing your month. That is your bankroll. Pick one small unit, usually 1% to 3% of the bankroll, and bet the same unit every time. On a $100 bankroll, a 2% unit is $2. The fixed unit protects you from one bad weekend. Our guide to sports betting bankroll management shows the math behind unit sizes, the Kelly formula and how often a bankroll runs out.
Is It Legal to Bet at Offshore Sportsbooks?
Thirty-nine states and the District of Columbia have legalized some form of sports betting, according to the FBI (Dec. 17, 2025). The American Gaming Association counts 40 jurisdictions. An offshore sportsbook holds no license from any of those states. The plain-English answer on offshore betting is: it is a gray zone with no protection, and your state may treat the site as illegal even if nobody pursues you.
- What the states say. The Michigan Gaming Control Board sent cease-and-desist letters to 33 offshore operators on Oct. 8, 2026. It says players on those sites have no access to state self-exclusion or deposit limits, no independent game testing and “no recourse through the MGCB if winnings are withheld or an account is closed.”
- What the FBI says. Some websites are legal elsewhere in the world but “are still operating illegally in the United States dependent on state regulations.” The FBI also says offshore books “may lack consumer protections.”
- What federal law says about the bettor. A Congressional Research Service report says the Wire Act is aimed at people “engaged in the business of betting or wagering” and “apparently cannot be used to prosecute simple bettors.” That report was last updated in 2012, so treat it as background, not a promise.
Our take: the risk to your money is bigger than the risk of a knock on the door. If a book withholds a payout, no U.S. regulator will make it pay. This is not legal advice. Check your state gaming agency’s list of licensed operators first, and read the real risks of betting at offshore sportsbooks before you deposit anywhere. Never bet money you cannot afford to lose.
How Do You Read an Odds Board and Place a Bet?
| Part of the board | What it means |
|---|---|
| Team names | The two teams. The away team is usually listed first. |
| Point spread | The head start or handicap, with its price. |
| Total (O/U) | The combined score number, with a price for Over and Under. |
| Moneyline | The straight-up price to win the game for each team. |
| Rotation number | An ID for each team, used mostly at in-person counters. |
Online, tap the price to add it to a bet slip, type your stake and confirm. The slip shows your potential profit before you submit. Once a bet is placed it stands. After the game, the book grades it as a win, loss or push, and a win adds the money to your balance. Settlement speed varies by book and sport.
What Should You Do in Your First Week?
Treat week one as practice with a small cap. This plan assumes a made-up $100 bankroll, a 2% unit ($2) and a weekly cap of 5 units ($10, or 10% of the bankroll). Scale it to your own numbers. It is our suggestion, not a rule.
| Day | What to do | Money at risk |
|---|---|---|
| 1 | Set the bankroll and the unit. Confirm that your option is licensed in your state. | $0 |
| 2 | Read three odds boards. Turn each price into a break-even win rate with the table above. | $0 |
| 3 | Make five paper bets. Write the bet, the price and one sentence on why. | $0 |
| 4 | Grade the paper bets. Note whether the price moved against you by game time. | $0 |
| 5 | Place one real bet: a spread or moneyline on a game you know. One unit. | $2 |
| 6 | Compare prices at two places before one more bet. One unit. | $2 |
| 7 | Game day. Up to three units, still inside the weekly cap. Log every bet. | Up to $6 |
That is 5 units, or $10, at most. The goal is not profit. The goal is five logged bets, correct price math and a habit of stopping at the cap. If you want to practice on football, start with how to bet on the NFL and our guide to reading NFL betting odds.
Which Beginner Mistakes Cost the Most?
- Betting money you cannot afford to lose. Set the budget before the first bet.
- Chasing losses. Doubling up to get even turns a small loss into a big one.
- Ignoring the price. A -105 and a -120 on the same line are different bets.
- Parlaying everything. Each added leg adds another fee. See the parlay math above.
- Skipping line shopping. A half point can turn a loss into a push. For habits that keep betting sustainable, read our responsible NFL betting guide.
Watch: How to Read Betting Odds
This short walkthrough from DWZ TV covers moneylines, spreads and over/unders in plain English.
More from DWZ TV → Watch all episodes on YouTube | DWZ TV on Daily Wager Zone
Where Should You Go Next?
| If you want to… | Read this |
|---|---|
| Learn how spreads and totals are built | NFL point spreads and over/unders: how the numbers work |
| Understand parlays before you build one | How NFL parlays work and what they cost |
| Size your bets and set a budget | Beginner NFL strategies, from bankroll to line shopping |
| Compare all three core bets side by side | NFL moneyline, spread and totals explained |
If you or someone you know has a gambling problem, call or text 1-800-MY-RESET, the National Council on Problem Gambling helpline (1-800-522-4700). Check your state’s minimum betting age before you sign up. Offshore sportsbooks are not licensed by U.S. state regulators; read their terms and payout rules before you deposit.
References
- Federal Bureau of Investigation. “Great Odds, High Risk: The FBI Encourages U.S. Bettors to Know the Risks of Illegal Gambling.” Public Service Announcement I-121725-PSA, Dec. 17, 2025. Checked October 15, 2026. https://www.fbi.gov/investigate/cyber/alerts/2025/great-odds-high-risk-the-fbi-encourages-us-bettors-to-know-the-risks-of-illegal-gambling
- Michigan Gaming Control Board. “MGCB issues 33 cease-and-desist letters, warns offshore sites offer no safety net for players trying to stop.” Oct. 8, 2026. Checked October 15, 2026. https://www.michigan.gov/mgcb/news/2026/10/08/mgcb-issues-33-cease-and-desist-letters
- Charles Doyle, Congressional Research Service. “Internet Gambling: An Overview of Federal Criminal Law.” Report 97-619, updated Jan. 24, 2012. Checked October 15, 2026. https://www.congress.gov/crs-product/97-619
- American Gaming Association. “Illegal Gambling.” Checked October 15, 2026. https://www.americangaming.org/illegalgambling/
- American Gaming Association. “State of Play” map of legal gaming by state. Checked October 15, 2026. https://www.americangaming.org/research/state-of-play-map/
