-240 Odds Explained
- Decimal
- 1.42
- American
- -240
- Fractional
- 5/12
- Implied probability
- 70.59%
- Polymarket
- 71¢
- $100 wins
- 41.67
- American
- -240
- Fractional
- 5/12
- Implied probability
- 70.59%
- Polymarket
- 71¢
- Profit
- 41.67
- Total return
- 141.67
1.417 decimal, -240 American, 70.59% implied probability
American odds of -240 mean
you risk 240 to win 100
. In decimal notation that is 1.42, in fractional notation 5/12, and the implied probability is 70.59%. On a prediction market the same price is a 71¢ share.
What -240 pays
A 100 stake at -240 returns 141.67 in total: your 100 back plus 41.67 profit. To win exactly 100 you would stake 240.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 4.17 | 14.17 |
| 25 | 10.42 | 35.42 |
| 50 | 20.83 | 70.83 |
| 100 | 41.67 | 141.67 |
| 500 | 208.33 | 708.33 |
| 1,000 | 416.67 | 1,416.67 |
Break-even and long-run results
The implied probability of -240 is 70.59%, and that number is also the break-even win rate: win more often than 70.59% of the time at this price and you profit in the long run, win less often and you lose. The table shows the return on stake at a few win rates, including the break-even rate itself.
| Win rate | Return on stake |
|---|---|
| 50% | -29.2% |
| 55% | -22.1% |
| 60% | -15.0% |
| 65% | -7.9% |
| 71% | 0.6% |
-240 marks a clear favourite without being a lock: the implied chance is 70.59%, so the bookmaker expects this outcome roughly two times in three. Moneylines on the better team in an evenly scheduled league, the higher-ranked tennis player, or the "under" in a low-total game are typical places to see it.
The vig at -240
If both sides of a two-way market were priced at -240, the implied probabilities would add up to 41.18% above 100%. That excess is the overround, or vig; as a share of stakes it is a 29.17% margin for the bookmaker. Removing it leaves fair odds of 2.00 decimal ( +100) on each side. Use the devig calculator to do the same for any market.
-240 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -240 is worth 1.408 decimal (-245 American); at 5% it drops to 1.396 (-253). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.408 | -245 | 71.01% |
| 5% | 1.396 | -253 | 71.64% |
Same price in other formats
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -240 mean in betting?
-240 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -240 the implied probability is 70.59% and a 100 stake returns 141.67.
What is -240 in decimal odds?
-240 converts to 1.417 in decimal odds (usually shown as 1.42). Decimal odds are the total return per unit staked, so multiply your stake by 1.417 to get the return.
What is -240 as a fraction?
-240 is 5/12 in fractional odds, the traditional bookmaker notation where the top number is profit and the bottom number is stake.
How much do I win on a 100 bet at -240?
A 100 stake at -240 wins 41.67 in profit and returns 141.67 including the stake. To win exactly 100 you would stake 240.00.
What win rate do I need at -240?
The break-even win rate equals the implied probability, 70.59%. Winning more often than that at this price is profitable over the long run; winning less often loses money.