Value Betting Glossary – 54 Sports Betting Terms Defined

This glossary defines the 54 terms you need to read value betting and dropping-odds content: each entry is one or two sentences, with a formula or a number where it helps, and a link to the page that explains the term in full.

Terms are grouped by topic, in the order you would learn them: odds and probability first, then margin and fair prices, then value, then how markets move, then bookmakers and limits, then staking and measuring results. Odds are decimal unless stated; how to read betting odds covers decimal, fractional and American formats.

Definition. Value betting is betting only when the odds offered are longer than the fair odds of the outcome, where fair odds = 1 ÷ true probability. Most value bettors estimate the true probability by removing the margin from Pinnacle's price and compare it with what other bookmakers offer.

What do the basic odds and probability terms mean?

Decimal odds. The total return per unit staked, stake included. A 10 stake at 2.50 returns 25 if it wins.

Fractional odds. The UK format: winnings relative to the stake. 3/2 means 3 won for every 2 staked, which is 2.50 in decimal (3 ÷ 2 + 1).

American odds (moneyline odds). The US format. +150 means 150 won on a 100 stake (decimal 2.50). −200 means you stake 200 to win 100 (decimal 1.50). Convert: +X → 1 + X/100; −X → 1 + 100/X.

Implied probability. The probability contained in a price: 1 ÷ decimal odds. 2.50 implies 40%. It includes the bookmaker's margin, so it overstates the real chance slightly. Formulas for every format in implied probability explained.

True probability. The real chance of an outcome. Nobody knows it exactly; value bettors estimate it, usually from a sharp bookmaker's fair price.

Favourite / odds-on. The outcome with the shortest price. "Odds-on" means a price below 2.00 (implied probability above 50%). See odds-on vs odds-against.

Underdog / odds-against. The outcome with the longer price. "Odds-against" means a price above 2.00.

Market. A type of bet on an event: match result (1X2), moneyline, handicap, total, player prop. How the main football markets move is covered in football dropping odds.

Line. The number a handicap or total is set at (−1.5, Over 2.5), and by extension the price attached to it. "The line moved" means the number, the price or both changed.

What do overround, vig and fair odds mean?

Overround (book). The sum of the implied probabilities of every outcome in a market. Prices of 1.91 / 1.91 give 52.36% + 52.36% = 104.7%. Full explanation: overround, vig and margin explained.

Margin. The overround minus 100%: 4.7% in the example above. Pinnacle's help centre says its markets average about 2% (Pinnacle Help Center, "What is a betting margin?", read 28/10/2026).

Vig / vigorish / juice. Informal names for the bookmaker's margin. "−110 juice" on both sides of a US spread is a margin of 4.76%.

Hold. The share of all stakes a bookmaker keeps if money is balanced across outcomes: 1 − 1/overround. At −110 / −110 the hold is 4.55%, slightly lower than the 4.76% margin.

Devig (no-vig). Removing the margin from a bookmaker's prices to recover the probabilities it is really pricing. Try it with the devig calculator.

Devig methods. Different assumptions about how the margin is spread. Multiplicative scales every probability equally; additive subtracts the same amount from each; power and Shin take more from long shots. On a 1.91 / 1.91 market they agree; on 1.25 / 4.20 they do not. See devig methods.

Fair odds / fair price / NVP. The price with no margin: 1 ÷ true probability. NVP stands for no-vig price. A 40% chance has fair odds of 2.50.

Favourite-longshot bias. The tendency of bookmakers to load more margin onto outsiders than onto favourites, so long shots are usually worse value than they look. It is the reason the power and Shin methods exist.

What do value, EV and edge mean?

Value bet. A bet whose odds are longer than the fair odds. If a 50% outcome is offered at 2.10, that is a value bet. Full explanation: what is a value bet.

Poisson distribution. A formula that turns a team's expected goals into the chance of each goal count, and from there every scoreline and goals market. See Poisson distribution in football betting and the Poisson calculator.

Expected value (EV). The average return per unit staked if the bet could be repeated many times: p × odds − 1. At 50% and 2.10, EV = +5%. Calculate it with the EV calculator.

+EV / −EV. Positive or negative expected value. Almost every bet at a normal bookmaker price is slightly −EV because of the margin. The method is explained in positive EV betting.

Edge. How much longer your price is than the fair price: odds ÷ fair odds − 1. For a single bet it equals EV.

Sharp reference price. A sharp bookmaker's price, de-vigged, used as the estimate of true probability. Pinnacle is the usual reference. See Pinnacle as a sharp reference price.

Stale price. A bookmaker price that has not yet updated after the market moved. Most practical value bets are stale prices.

Arbitrage (arb, surebet). Backing every outcome of a market at different bookmakers so that the best prices add up to less than 100% implied probability. Each leg can still be voided or limited. The formula, stake split and risks are in what is arbitrage betting; compared with value betting in our Betburger alternative article.

Line shopping. Checking several bookmakers and taking the longest price for the bet you want. It does not create value on its own, but it reduces the margin you pay. See line shopping in betting.

What do dropping odds, steam and line movement mean?

Dropping odds. A price that shortens because money or information arrived on that outcome. At Pinnacle, a drop is a signal that other bookmakers may now be too long. See what are dropping odds.

Line movement. Any change in a price or line between the opening and the start of the event.

Opening line. The first price a bookmaker posts. Limits are lowest and prices move most at this stage. See opening line vs closing line.

Closing line. The last price before the event starts (or before the market closes). It contains the most information and is the benchmark for CLV.

Steam move. A fast, market-wide price change driven by sharp money, often hitting several bookmakers within seconds. See steam move explained.

Reverse line movement (RLM). A price that moves against the side most bets are on, usually because fewer, larger bets from sharper bettors are on the other side. See reverse line movement.

Sharp money. Bets from bettors the bookmaker respects, which move the line. How to see it: how to track sharp money.

Rebound (bounce). A price that drifts back up after a drop, partly or fully reversing the move. See odds rebound after a drop.

Closed (locked) market. A market Pinnacle temporarily stops accepting bets on, often right after a large bet or news. A drop followed by a closed market is a strong signal. See Pinnacle closed markets.

Move grade. Pinnacle Terminal's label for a pre-match move: Big move, Sharp drop, Limit-backed, Downtrend, Rebound or Standard, with a 0–10 score. See move grades explained.

What do sharp, soft and limits mean?

Sharp bookmaker. A bookmaker that takes large bets, keeps winning customers and moves its prices on their money. Pinnacle is the best-known example. See sharp vs soft bookmakers.

Soft bookmaker. A bookmaker built around recreational customers: higher margins, slower updates, and restrictions on accounts that win. See the soft bookmakers list.

Limit (max bet). The largest stake a bookmaker accepts on a market at the current price. At Pinnacle, limits rise as the event gets closer and the price firms up. See Pinnacle limits explained.

Market limit vs outcome limit. The market limit is one cap Pinnacle sets for a whole line; the outcome limit is the max stake on one side at its current price, derived from the market limit and the odds. See market limit vs outcome limit.

Limit-backed move. A drop that comes with a higher Pinnacle limit: the book shortened the price and is willing to take more money at the new level, a sign of confidence in the move.

Low-limit market. A market with small limits (props, lower leagues, small esports events) where one modest bet can move the price a long way. See low-limit odds moves.

Account limiting (gubbing, restriction). When a bookmaker cuts the maximum stake on a customer's account, usually because the customer beats the closing line. See why bookmakers limit winners.

Player prop. A bet on an individual's statistics (points, shots, kills) rather than the match result. Usually lower limits and wider margins.

What do staking and bankroll terms mean?

Bankroll. The money set aside only for betting, separate from everything else. Stakes are sized as a share of it.

Unit. A standard stake, often 1% of the bankroll. Reporting results in units makes them comparable across bankroll sizes.

Flat staking. The same stake (or the same share of bankroll) on every bet, regardless of edge.

Kelly criterion. A staking formula that sizes each bet by edge and odds: stake = (p × odds − 1) ÷ (odds − 1) of the bankroll. Use the Kelly calculator; the Kelly criterion explained shows the formula with a worked example.

Fractional Kelly. Staking a fraction (for example a quarter or half) of the full Kelly amount, to reduce the damage when the probability estimate is too high.

Variance. The spread of results around the expected value. With a small edge, long losing runs are normal even when every bet is +EV.

Drawdown. The fall from a bankroll peak to the following low. A useful number for deciding how much risk you can live with.

What do the result-measuring terms mean?

Closing line value (CLV). How much better your price was than the fair closing price: your odds ÷ fair closing odds − 1. Consistently positive CLV is the best available evidence that your bets were value bets. See the closing line value guide.

Raw CLV vs no-vig CLV. Raw CLV compares with the quoted closing price; no-vig CLV compares with the closing price after removing the margin. No-vig CLV is the stricter and more accurate figure.

ROI (return on investment). Net result divided by total staked. It depends heavily on luck over small samples, which is why CLV is checked alongside it.

Sample size. The number of bets you judge a method on. A few dozen bets say almost nothing about a small edge; hundreds or thousands are needed.

Bet tracker. A record of every bet: date, market, odds taken, stake, closing price, result. Pinnacle Terminal's tracker calculates CLV automatically; see the CLV tracker guide.

How Pinnacle Terminal uses these terms

In Pinnacle Terminal, every line shows Pinnacle's live price, its fair price (NVP) under four devig methods plus a worst case, the current limit, and any move grade. Telegram alerts carry the same fields. The tracker records the odds you took and reports CLV against the de-vigged closing price. The terminal does not accept bets and is not affiliated with Pinnacle.

FAQ

What is the most important value betting term to understand?

Fair odds. Value, EV, edge and CLV are all measured against the fair price, so if the fair price is wrong, every other number is wrong too.

What is the difference between implied probability and true probability?

Implied probability is 1 ÷ the bookmaker's odds and includes its margin. True probability is the real chance of the outcome, which you estimate, for example by devigging Pinnacle's price.

Is EV the same as edge?

For a single bet at decimal odds, yes: p × odds − 1 equals odds ÷ fair odds − 1. People use "edge" more loosely for an average advantage across many bets.

What does NVP mean in betting?

No-vig price: the bookmaker's price with the margin removed. It is the same as the fair price.

What is the difference between a sharp and a soft bookmaker?

A sharp bookmaker accepts large bets from winning customers and moves its prices on their money. A soft bookmaker targets recreational customers, updates more slowly and restricts accounts that win.

Try it

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