Fixed Odds
A bet whose payout rate is locked in at the odds shown when you place it, no matter how the odds move afterwards.
Definition
Fixed odds is the traditional betting model in which the operator quotes a price for an outcome, and once a stake is accepted at that price the potential return is fixed for that bet. If the market moves before the event, later bets take the new price but the settled ticket is unaffected — a winning bet pays the agreed stake multiplied by the agreed odds, and a losing bet forfeits the stake. This contrasts with pari-mutuel (pool) betting, where the effective price is only known after all stakes are pooled and the pool is divided among winners, and with spread or in-running cash-out products where the exposure can change.
Worked example
A bettor stakes £10 on a football team priced at decimal odds of 2.50 (equivalent to 6/4 fractional or +150 American). That price is locked to the ticket. If the team later drifts to 3.00 because of an injury, the existing bet still settles at 2.50: a win returns £25 in total (£15 profit plus the £10 stake), while a loss costs the £10 stake. A different bettor backing the same team after the move would instead be locked in at 3.00.
Why it matters
Fixed odds is the default mental model most bettors and newcomers to the industry start from, so understanding it is the foundation for reading a betting market. For professionals it clarifies where operator liability sits: because the price is guaranteed at placement, the operator carries the risk of subsequent market moves, which is why traders manage prices, limits and liability in real time. It also frames key contrasts — pool betting, spread betting and cash-out — that a learner needs in order to see how different products distribute risk between operator and player.
Related
Note: Stable definition. Odds display conventions vary by region (decimal in most of Europe, fractional in the UK and Ireland, American in the US), and the term "fixed-odds betting" also appears in specific regulatory contexts — notably UK fixed-odds betting terminals (FOBTs), a distinct machine-gaming topic that should not be conflated with the general concept. Availability of specific fixed-odds markets and any tax treatment on stakes or winnings vary by jurisdiction and operator.