-278 Odds Explained
- Decimal
- 1.36
- American
- -278
- Fractional
- 32/89
- Implied probability
- 73.54%
- Polymarket
- 74¢
- $100 wins
- 35.97
- The fraction shown is the closest simple fraction to the odds rounded to 3 decimals, not an exact match.
- American
- -278
- Fractional
- 32/89
- Implied probability
- 73.54%
- Polymarket
- 74¢
- Profit
- 35.97
- Total return
- 135.97
1.360 decimal, -278 American, 73.54% implied probability
American odds of -278 mean
you risk 278 to win 100
. In decimal notation that is 1.36, in fractional notation 32/89, and the implied probability is 73.54%. On a prediction market the same price is a 74¢ share.
What -278 pays
A 100 stake at -278 returns 135.97 in total: your 100 back plus 35.97 profit. To win exactly 100 you would stake 278.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 3.60 | 13.60 |
| 25 | 8.99 | 33.99 |
| 50 | 17.99 | 67.99 |
| 100 | 35.97 | 135.97 |
| 500 | 179.86 | 679.86 |
| 1,000 | 359.71 | 1,359.71 |
Break-even and long-run results
The implied probability of -278 is 73.54%, and that number is also the break-even win rate: win more often than 73.54% 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% | -32.0% |
| 55% | -25.2% |
| 60% | -18.4% |
| 65% | -11.6% |
| 74% | 0.6% |
With an implied probability of 73.54%, -278 is a moderate favourite. Prices in this band are where the bookmaker's margin is easiest to see: the opposite side of the market is usually priced a little longer than the fair line, and the two implied probabilities add up to more than 100%.
The vig at -278
If both sides of a two-way market were priced at -278, the implied probabilities would add up to 47.09% above 100%. That excess is the overround, or vig; as a share of stakes it is a 32.01% 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.
-278 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -278 is worth 1.353 decimal (-284 American); at 5% it drops to 1.342 (-293). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.353 | -284 | 73.94% |
| 5% | 1.342 | -293 | 74.53% |
Same price in other formats
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -278 mean in betting?
-278 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -278 the implied probability is 73.54% and a 100 stake returns 135.97.
What is -278 in decimal odds?
-278 converts to 1.360 in decimal odds (usually shown as 1.36). Decimal odds are the total return per unit staked, so multiply your stake by 1.360 to get the return.
What is -278 as a fraction?
-278 is 32/89 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 -278?
A 100 stake at -278 wins 35.97 in profit and returns 135.97 including the stake. To win exactly 100 you would stake 278.00.
What win rate do I need at -278?
The break-even win rate equals the implied probability, 73.54%. Winning more often than that at this price is profitable over the long run; winning less often loses money.