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Understand every number on the board

Plain-English guides to how betting odds work, how to judge a price, and how edges like +EV, arbitrage and middles are found. Every term explained where it appears and every example worked out. Bet the number, not the jersey.

28 guides
133 minutes of reading
10 free calculators
$0 to use

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New to betting odds? Five short guides, in order.

How to read American oddsWhat plus and minus odds mean, how to work out a payout from American odds, and how they convert to decimal odds and implied probability.2 min
Implied probabilityTurn any odds into the win probability they imply, see how much margin a line carries, and learn why implied probability is the key to value betting.2 min
What are no-vig oddsWhat the vig is, why both sides of a coin flip cost −110, how to remove it to get no-vig odds, and how to use the no-vig price to judge any bet.3 min
Line shoppingWhy comparing odds across sportsbooks is the simplest edge in betting, how much half a point or ten cents is worth, and how to shop lines quickly.2 min
How to find +EV betsWhat positive expected value means in sports betting, how +EV is measured against the no-vig price, and where to find live +EV bets for free.2 min

Start with step 1 →

Browse by topic

Odds basics

What the numbers mean: reading a price, the probability inside it, and the margin the book keeps.

How to read American oddsBeginner2 minWhat plus and minus odds mean, how to work out a payout from American odds, and how they convert to decimal odds and implied probability.Read the guide Implied probabilityBeginner2 minTurn any odds into the win probability they imply, see how much margin a line carries, and learn why implied probability is the key to value betting.Read the guide What are no-vig oddsBeginner3 minWhat the vig is, why both sides of a coin flip cost −110, how to remove it to get no-vig odds, and how to use the no-vig price to judge any bet.Read the guide Line shoppingBeginner2 minWhy comparing odds across sportsbooks is the simplest edge in betting, how much half a point or ten cents is worth, and how to shop lines quickly.Read the guide Sports betting glossaryBeginner8 minVig, hold, juice, push, steam, CLV, middles, arbitrage and more: the sports betting terms used on vigged, each defined in a sentence or two of plain English.Read the guide

Finding edges

How a bet can be worth more than it costs, and how to tell whether you are beating the market.

Why odds moveIntermediate9 minWhy sportsbook lines change from open to close: news, sharp bets, limits, market makers and public money, and what a line move does and does not tell you.Read the guide How to find +EV betsIntermediate2 minWhat positive expected value means in sports betting, how +EV is measured against the no-vig price, and where to find live +EV bets for free.Read the guide Arbitrage betting explainedIntermediate2 minHow sports arbitrage works, how to size both legs, why arbs are small and short-lived, and the real risks: voids, limits, rule differences and errors.Read the guide What is a middleAdvanced2 minHow middling a spread or total works, how often middles land, key numbers in football, and how to judge whether a middle is worth taking.Read the guide Closing line value (CLV)Advanced2 minWhat closing line value is, how to measure CLV against the no-vig closing price, and why beating the close is the best evidence a bettor has an edge.Read the guide De-vig methods: the evidenceAdvanced9 minWhich de-vig method is most accurate? On 725,000 results, power won sharp moneylines and soccer, multiplicative retail moneylines in North American leagues.Read the guide Half point backtestAdvanced13 minHow often finals land on 3, 7, an odd total or a one-run win, by league: vigged’s key-number model scored against closing lines and scores, and what changed.Read the guide NFL same game parlay house edgeAdvanced9 minWhat an NFL same game parlay costs over a normal parlay of the same legs: DraftKings and FanDuel quotes scored against each book’s own prices and NFL results.Read the guide Wong teaser resultsAdvanced7 minEvery NFL Wong teaser leg from 1999 to 2026 against the closing line: 1,422 legs and 2,177 teasers by season, side and price. What still clears the juice.Read the guide What percent of bettors winBeginner5 minAbout 1 in 4 betting accounts ends a year ahead, and 1 in 100 by more than $1,000. Luck against skill, and why the price you bet at matters most.Read the guide

Bankroll and variance

Even a winning bettor loses for weeks at a time. How to size bets so the swings stay survivable.

Bankroll and varianceBeginner3 minUnits, flat and percentage staking, and how big the swings are: simulate hundreds of bets at your win rate and price to see the range of outcomes.Read the guide

Prediction markets

Kalshi and Polymarket price sports as contracts. How to read them and compare them with a sportsbook.

Polymarket vs sportsbooksIntermediate3 minHow Polymarket sports prices work, how to convert cents to odds, how they compare to sportsbook lines, and what US bettors should know about access.Read the guide Kalshi sports oddsIntermediate3 minHow Kalshi sports event contracts are priced, how to convert a Kalshi price to American odds and probability, fees, and how they compare to sportsbooks.Read the guide

Sport by sport

What changes in one sport: its markets, its key numbers and where books disagree.

NFL overtime and tiesIntermediate6 minBoth teams now get the ball in NFL overtime, on a 10-minute clock. How many extra ties that adds, what has happened since 2025, and how ties settle bets.Read the guide Fading backup QBsIntermediate6 minEvery NFL game since 2002 in which the QB1 was ruled out and his backup made his first start: 86-85-7 against the closing spread, and what the moneyline showed.Read the guide UFC betting anglesAdvanced12 min7,187 UFC closing lines since 2010: chalk is priced right, big dogs lose 29 cents on the dollar, and the line underprices age, red corners and main event dogs.Read the guide UFC red corner and the judgesAdvanced7 minThe red corner wins 57.8% of UFC fights against a 55.9% closing line. Split by how fights end, the edge holds in knockouts and vanishes in split decisions.Read the guide College basketball bettingBeginner4 minHow college basketball spreads and totals work, why books disagree more than in the NBA, and what changes for conference tournaments and March Madness.Read the guide Tennis betting oddsBeginner3 minHow tennis odds work: the match moneyline, games handicaps, total games, live betting between points, and what happens to a bet when a player retires.Read the guide

Soccer betting

Three outcomes instead of two: the 1X2, the draw, Asian handicaps and how soccer bets settle.

How to read soccer oddsBeginner3 minWhat 1, X and 2 mean, how decimal and American soccer prices convert, why bets settle after 90 minutes, and how totals like 2.5 and 2.25 differ.Read the guide Three-way moneyline and the drawBeginner2 minHow a three-way soccer moneyline works, what the draw does to the price, how to remove the vig from three outcomes, and where the two-way lines come in.Read the guide Asian handicap explainedIntermediate2 minHow Asian handicaps settle at 0, −0.5, −1 and the quarter lines −0.25 and −0.75, with every result and payout worked out exactly, plus quarter goal totals.Read the guide Draw no betBeginner2 minWhat draw no bet means, why it is the same as an Asian handicap of 0, and how to work out a no-vig draw no bet price from the three-way moneyline.Read the guide

Test yourself

Question 1 of 5

A team is +150. What profit does a winning $100 bet make?

Jargon buster

Every term on the site in a sentence or two. All 60 terms →

Vig: The margin a book builds into its prices: the reason both sides of a coin flip are −110, not +100. Short for vigorish; also called juice.
Hold: The book’s margin on a market: how far its implied probabilities add up above 100%. About 4.8% on −110 both ways.
Push: A tie with the line, such as a 3-point win on −3. The stake comes back.
Steam: A fast, market-wide line move, usually after big bets from respected bettors hit several books at once.
Sharp: A bettor, or a book, whose prices and bets tend to beat the closing line. The opposite of square.
Key number: A margin of victory that comes up unusually often, like 3 and 7 in the NFL. Half a point through a key number is worth much more than elsewhere.
Closing line value (CLV): How much better the price you took was than the closing price. Beating the close regularly is the best evidence a bettor has of an edge.
Unit: A standard bet size, usually 1% to 2% of a bankroll, so results compare across bettors and bankrolls.

Try the math

Free calculators that use the same math as the live boards. All 10 tools →

Put it to work

Every board shows the best price and a no-vig price for each side; the edges pages list live +EV bets, arbitrage and middles. The method behind the no-vig price is on how no-vig odds work. Which sportsbooks are legal where you live: sports betting by state. How each book prices, pays and limits: sportsbook reviews.

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Frequently asked questions

What is vigged?

vigged is a free odds screen. It shows live prices from US sportsbooks side by side, the no-vig price for every game, and the prices currently beating it (+EV), plus arbitrage and middles. Same bet. Better number.

Where should a beginner start?

Follow the five-step path at the top of this page: how to read American odds, implied probability, what no-vig odds are, line shopping, then how to find +EV bets. Those ideas explain every number on the boards and the edges pages.

Do I need to know any math?

Only division. Every guide works through examples step by step, and the free calculators on the tools page do the arithmetic for you with the same math as the live boards.

How is my progress saved?

In your browser only. Guides you read to the end are ticked on this page; nothing is sent to vigged. Clearing your browser data, or the reset link, starts you over.

Where are the calculators?

On the tools page: an odds converter and no-vig, EV, arbitrage, hedge, parlay and Kelly calculators, plus a worst line vs best line calculator. They are free and run in your browser with the same math as the live boards.

21+ | Gambling problem? Call 1-800-GAMBLER. Nothing here is betting advice, and no bet or strategy guarantees a profit. Sports betting is legal only in some US states; check the rules where you are. Responsible gambling.