Free Bet
A free bet is a sportsbook credit that lets you place a wager without staking your own money, but if it wins you receive only the winnings — the free-bet stake itself is not returned.
Definition
A free bet (also called a bet credit or bonus bet) is a promotional token a sportsbook grants — typically as a sign-up offer, a refund on a losing bet, or a loyalty reward — that a player stakes on a selection instead of using cash from their balance. Its defining feature is that it is "stake-not-returned" (SNR): if the bet wins, only the net winnings are paid out and the token's face value is kept by the operator, so a winning free bet returns less than an identical cash bet. Free bets almost always carry conditions — minimum odds, an expiry date, single use, and restrictions on which markets or events qualify — set out in the offer's terms. Because the stake is never returned, a free bet is worth noticeably less than its headline amount, and it only converts to withdrawable cash through the winnings it generates, not directly.
Worked example
Suppose a sportsbook grants a £10 free bet and the player places it on a selection priced at decimal odds of 4.00. If it wins, the return is the net winnings only: £10 × (4.00 − 1) = £30, with the £10 token retained by the operator. An identical £10 cash bet at the same odds would return £40 (£30 profit plus the £10 stake back), so the free bet is worth £10 less than a cash bet of the same size. This is why a free bet's real value sits below its face value — at fair odds it is roughly (odds − 1) ÷ odds of the amount, about 75% here (3 ÷ 4) — and why that value rises as odds lengthen, because the retained stake becomes a smaller share of the total return. If the bet loses, the player loses none of their own money, but the free bet is simply used up.
Why it matters
For players, understanding that a free bet's stake is not returned is essential to judging what an offer is actually worth: a "£30 in free bets" promotion is worth meaningfully less than £30 in cash, and its real value depends on the odds it is used at. For operators and marketers, free bets are a core acquisition and reactivation tool whose true cost — and the fair way to advertise it — hinges on this stake-not-returned mechanic and the attached terms. Because these are gambling promotions, advertising codes require that the terms are clear and that offers are never presented as risk-free or a route to guaranteed money; a free bet is a structured entertainment offer, not a source of income.
Related
Note: The stake-not-returned mechanic is the standard, stable definition of a sportsbook free bet, but specific terms vary widely by operator and offer: minimum-odds requirements, expiry windows, eligible markets, single- vs multi-use, whether resulting winnings carry their own wagering requirement, and any maximum-stake or maximum-payout caps are all set in individual terms and conditions. Some jurisdictions restrict or scrutinise free-bet advertising — for example UK CAP/BCAP rules on "free" and "risk-free" claims — so permitted framing and required disclosures differ by market and should be verified locally. The £10 / 4.00-odds figures are illustrative; always check the exact terms of a given offer.