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Most guides assume you already know what each-way means and that you can tell decimal and fractional odds apart. This one doesn't. It collects the terms UK punters actually encounter, grouped by topic, with complete answers instead of one-line definitions. If you're brand new to betting, start with our guide to free bets and sign-up offers and come back here when a term trips you up. Experienced punters can use this page as a fast reference rather than a tutorial.
Odds and prices
What are fractional odds?
Fractional odds are the traditional UK format, written as a pair of numbers separated by a slash (5/1, 10/3, 1/2). The first number shows potential profit; the second shows stake. A £1 winning bet at 5/1 returns £5 profit plus your original £1 stake, so £6 total. Odds-against prices (where the first number is larger than the second, like 5/1) indicate the outcome is considered less likely than the other side of the market. Odds-on prices (like 1/2 or 2/5) indicate the outcome is considered more likely and pay less than even money. UK racing, football outrights, and traditional retail coupons still use fractional odds as standard; decimal odds are more common on online sportsbooks and on the betting exchanges.
What are decimal odds?
Decimal odds represent the total return (profit plus stake) on a £1 winning bet. Decimal odds of 6.00 pay £6 total on a £1 stake: £5 profit plus the £1 stake returned. Decimal is the standard format on most online sportsbooks and on betting exchanges because it's easier to compare across markets and faster for calculating accumulators: you simply multiply the decimal odds of each selection to get the combined price. The conversion is straightforward. Fractional 5/1 equals decimal 6.00 (the fractional profit plus 1); fractional 10/3 equals decimal 4.33, and so on. Most UK online bookmakers let you switch between formats in your account settings.
What is Starting Price (SP)?
When a horse goes off, its Starting Price is fixed from a sample of on-course bookmaker prices. It's the default price you receive if you back a horse "at SP" rather than taking an early price. Starting Prices are published after each race and used in best-odds-guaranteed concessions: if you took an early price of 4/1 and the SP is 5/1, BOG pays out at 5/1. SP is also used to settle tote and some bet-builder products, and it's the reference price for many betting newspapers and tipping services.
What is a price boost?
A price boost is an enhanced-odds promotion where the bookmaker advertises a selection at a higher price than the regular market, often on a specific fixture, horse, or bet-builder combination. Boosts appear as a dedicated section on most UK bookmaker apps and update through the day. A boost is only useful if the new price beats what you'd get at two or three other books on the same selection. It shouldn't be a reason to place a bet you wouldn't otherwise have placed; the bookmaker chooses which selections to boost, and the product is designed to encourage activity rather than to hand out value indiscriminately.
Bet types
What is a win bet?
A win bet is the simplest form of sports bet: you back a selection to win the event, and the bet pays out if it does. A £10 win bet at 5/1 returns £50 profit plus the £10 stake on a winner, and loses the £10 stake on anything else. Win bets are the default in football (team to win the match), cricket (team or player to win), and tennis (player to win the match). In horse racing, a win bet is distinct from an each-way bet and pays only if the horse finishes first.
What is each-way betting?
Each-way combines a win bet and a place bet into one wager. A £5 each-way bet on a horse at 10/1 costs £10: £5 on the horse to win, £5 on the horse to place (finish in the top few positions). If the horse wins, both parts pay out: £5 at 10/1 for the win, plus £5 at one-quarter or one-fifth of 10/1 for the place, depending on the race's place terms. If the horse only places, the win part loses and the place part pays at the place fraction. Each-way is standard on horse racing and golf; the number of places paid and the place fraction depend on the race or tournament and the bookmaker's current terms.
What is an accumulator?
An accumulator, universally shortened to "acca" in the UK, combines multiple selections into a single bet. The total odds are the product of each selection's odds, and every selection must win for the bet to pay out. A four-fold acca with selections at 2.00, 2.00, 2.00, and 2.00 decimal produces combined odds of 16.00: a £10 stake returns £160 on a winner. The mathematical trade-off is unforgiving. The more selections, the higher the potential return and the lower the probability of all of them winning. Accas are the most heavily promoted product in UK football betting, partly because the house edge compounds across multiple selections, which is also the reason professional punters rarely place them.
What is a bet builder?
A bet builder (sometimes called a same-game multi or combi-bet) is a form of accumulator where multiple outcomes within a single match are combined into one bet. You might combine "both teams to score" with "over 2.5 goals" with "a specific player to get a yellow card", all in the same fixture. The bookmaker's pricing engine calculates combined odds that account for the correlation between the legs. Some combinations are correlated (both teams scoring and over 2.5 goals tend to go together), so the combined odds are lower than a simple product of the individual prices. Bet builders are hugely popular but carry meaningfully higher bookmaker margins than standard match-result bets.
What does "Cash Out" mean?
Cash Out lets you settle an unsettled bet early, for a current value offered by the bookmaker. If your bet is currently winning (an acca with four of five legs already settled, say), Cash Out locks in a guaranteed profit smaller than the full potential win. If your bet is losing, Cash Out returns part of the stake. Partial Cash Out, offered on eligible bets, lets you take out a portion of the value while leaving the rest of the stake running. The Cash Out value always includes a margin in the bookmaker's favour, so over time it costs more than holding the bet to the end. For managing in-play variance, it's still a useful tool.
What is a lay bet?
A lay bet is a bet placed against something happening; you're effectively taking the bookmaker's side of the trade. If you lay a horse at 5/1, you're betting the horse will not win. If it doesn't win, you collect the other punter's stake; if it does, you pay out at 5/1. Laying is only available on betting exchanges (Betfair being the largest in the UK), not on standard sportsbooks. Lay betting opens strategies that simply aren't available with traditional bookmakers. Trading out of positions in-play, hedging accumulators, and structured matched-betting approaches all depend on access to a lay market.
Markets
What is the 1X2 market?
1X2 is the standard football match-result market: "1" is a home win, "X" is the draw, "2" is an away win. It's the simplest football bet and the one most heavily traded. Bookmaker margins on the 1X2 market vary from around 3% at the sharpest exchange-backed pricing to 8-10% at softer retail-facing books. If you compare the three 1X2 prices across two or three bookmakers before placing a bet, you'll often find one book materially ahead on one outcome. Price-checking across two or three books before placing a 1X2 bet is worth the 30 seconds.
What is Asian handicap betting?
Asian handicap is a football market that applies a handicap to one team to equalise the market's implied probabilities and either eliminates the draw or splits stakes around it. A team given a -1.5 handicap must win by two or more goals for the bet to win; a team given a +0.5 handicap wins the bet if the match is drawn or if that team wins. Asian handicaps are popular with serious football bettors because the margin is typically lower than on the 1X2 market and because the bet structure allows for more nuanced views than "home win / draw / away win." The quarter-goal handicaps (e.g. -0.25, +0.75) split stakes between two adjacent whole or half handicaps, which gives you a form of partial refund on close outcomes.
What are over/under markets?
Over/under (also called totals) lets you bet on whether a numerical match statistic (most commonly goals, but also corners, cards, or points in non-football sports) will be higher or lower than a line set by the bookmaker. Over 2.5 goals in a football match wins if there are three or more goals; under 2.5 wins if there are two or fewer. Half-goal lines eliminate the push (tie); whole-number lines (over 2.0 goals) can push if exactly that total is scored, in which case the stake is refunded. Over/under markets tend to have competitive margins and are useful for expressing match-flow views that don't depend on which team wins.
What is ante-post betting?
Ante-post betting is placing a bet on an event well before it takes place, usually weeks or months ahead. Ante-post is most common in horse racing (Cheltenham Festival, Grand National, Royal Ascot all have active ante-post markets months out) and football outrights (league winner, top scorer). The trade-off is price for risk: ante-post prices are generally more generous than they will be closer to the event, but you take on the risk that your selection might not run. That's where Non-Runner Money Back concessions (refunding the stake as a free bet if the horse doesn't run) become relevant.
Account, concessions, and offers
What is "Best Odds Guaranteed"?
Best Odds Guaranteed (BOG) is a standard UK horse racing concession that pays your bet at the higher of the price you took and the official Starting Price, if the horse wins. If you backed a horse at 4/1 in the morning and it went off at 5/1, BOG pays at 5/1. It's offered by most UK high-street bookmakers on UK and Irish racing, typically from a stated point on the morning of the race. Eligible meetings, maximum stake and payout, and the start time of the concession vary; check the live terms on each bookmaker's site before assuming BOG applies.
What is "Non-Runner Money Back"?
Non-Runner Money Back is an ante-post concession: if you place an ante-post bet on a horse and the horse doesn't run in the race, your stake is refunded, usually as a free bet rather than cash. It's a standard feature of major UK festival ante-post markets and addresses the biggest risk in ante-post betting, which is that your horse simply doesn't make the start. The specific terms (eligible meetings, refund method, refund expiry) vary by bookmaker and by race, so check the live promotion terms on each ante-post market before betting.
What is a free bet?
A free bet is a stake credited by the bookmaker that can be placed as a bet without depositing cash. Free bets usually have restrictions: minimum odds, eligible markets, expiry window, and (critically) the stake is not returned if the bet wins, only the net winnings. A £30 free bet at 2.00 decimal odds wins £30 net, not £60. Free bets are the currency of most UK sign-up offers and ongoing loyalty promotions; understanding exactly what you do and don't get back is the foundation of any sensible use of them. For more on this, see our sign-up offers guide.
What is a qualifying bet?
A qualifying bet is the first bet you place at a bookmaker after signing up, which unlocks the new-customer promotion. Qualifying bets usually carry minimum-odds requirements (2.00 or 1.50 decimal is typical) and must be a stake bet rather than a free bet. Once the qualifying bet settles, win or lose, the promoted bonus is credited. Reading the qualifying-bet terms is the step that catches most new punters out: a bet placed at odds below the minimum, on an excluded market, or via an excluded payment method can fail to qualify without obvious warning.
What is stake restriction?
Stake restriction is when a bookmaker limits the maximum stake you can place on specific bets or your account overall. Most UK sportsbooks reserve the right to restrict stakes on accounts they identify as consistently winning or following value-hunting strategies. The practice is controversial but widespread and is not specific to any single operator. For recreational punters, stake restriction is rarely an issue. For serious bettors, it's a structural feature of the UK market and part of why holding multiple accounts and using betting exchanges (which don't restrict in the same way) is a common approach.
Frequently asked
What does 'odds' mean in betting?
Odds are the price a bookmaker sets for a particular outcome. In the UK, odds are typically shown in fractional format (e.g. 5/1) or decimal format (e.g. 6.00). Fractional odds of 5/1 mean a £1 winning bet returns £5 profit plus your £1 stake back; decimal odds of 6.00 mean a £1 bet returns £6 total (including stake).
What is each-way betting?
Each-way is a combined bet on a selection to win and to place (finish in the top few positions). The stake is doubled: £5 each-way on a horse at 10/1 costs £10. It's commonly used in horse racing and golf. The place terms (how many places pay out, at what fraction of the win odds) depend on the race or event and the bookmaker's current concessions.
What is an accumulator?
An accumulator (an 'acca') is a single bet combining multiple selections, where the combined odds are multiplied and all selections must win for the bet to pay out. Accumulators offer high potential returns but low probability of success; a four-fold at average football odds still has a payout probability well under 20%.
What does 'Cash Out' mean?
Cash Out lets you settle an unsettled bet before the event finishes, for a current value offered by the bookmaker. If your bet is currently ahead, Cash Out locks in a profit smaller than the full potential win; if behind, it lets you recover part of the stake. The offered value always includes a margin in the bookmaker's favour.
What are Asian handicap markets?
Asian handicap is a football betting market that applies a handicap to one team to equalise market probabilities, and eliminates (or partially eliminates) the draw as an outcome. It's popular with serious football bettors because it tends to offer lower bookmaker margins than the standard 1X2 market and allows for more nuanced views on match outcomes.
What is 'Best Odds Guaranteed'?
Best Odds Guaranteed (BOG) is a horse racing concession: if you take an early price and the Starting Price (the official price at the off) is higher, the bookmaker pays out at the higher price. BOG is standard at most UK high-street bookmakers on UK and Irish racing, but the applicable window, eligible meetings, and maximum payout vary; check the live terms.
What is a bet exchange and how is it different from a bookmaker?
A betting exchange (like Betfair Exchange) matches punters against each other rather than acting as the bookmaker. Odds tend to be better because there's no bookmaker margin built into the price; the exchange takes a commission on winning bets instead. Exchanges also let you 'lay' outcomes, backing something not to happen, which isn't available on standard sportsbooks.
