What does odds-on mean?
Odds-on describes any price shorter than evens, meaning below 2.00 in decimal odds or a minus number in American odds, where the potential profit is smaller than the amount you stake.
Evens (1/1, 2.00, +100) is the halfway mark: stake £10 to win £10. Any price shorter than that is odds-on. Any price longer is odds-against.
| Fractional | Decimal | American | Implied chance | |
|---|---|---|---|---|
| Odds-on | 4/6 | 1.67 | −150 | 60.0% |
| Evens | 1/1 | 2.00 | +100 | 50.0% |
| Odds-against | 6/4 | 2.50 | +150 | 40.0% |
It’s a British and Irish expression. With fractional odds you spot it when the right-hand number is bigger than the left. Bookies read 4/6 aloud as “six to four on”. Americans don’t really use the phrase. They’d say “a minus-money favourite” or “laying −150”.
An odds-on price tells you the market gives the selection a better than 50% chance. An “odds-on favourite” is simply a favourite priced below evens.
Example
You put £30 on a team at 4/6 (1.67).
- Profit if they win: 30 × 4 ÷ 6 = £20
- Total back: £50
- If they don’t win: you lose £30
You’re risking £30 to make £20. To break even at this price, your bets need to win 60% of the time.
Watch out
Odds-on bets win often, and that’s what makes them dangerous. A run of winners at 1.30 feels great until a single loser eats the profit from more than three of them. Ask the same question you’d ask of any bet: is the real chance higher than the implied probability? A 1.67 shot that wins 65% of the time is a good bet. One that wins 55% of the time is a bad bet that happens to win a lot.
People also stack odds-on picks in accumulators “to boost the price”. Five legs at 1.30 come to 3.71, and all five land only about a quarter of the time.