+278 Odds Explained
- Decimal
- 3.78
- American
- +278
- Fractional
- 139/50
- Implied probability
- 26.46%
- Polymarket
- 26¢
- $100 wins
- 278.00
- American
- +278
- Fractional
- 139/50
- Implied probability
- 26.46%
- Polymarket
- 26¢
- Profit
- 278.00
- Total return
- 378.00
3.780 decimal, +278 American, 26.46% implied probability
The price +278 converts to 3.78 decimal odds and 139/50 fractional odds. Read as a probability it says the bookmaker prices this outcome at 26.46%, which is the share of the time you would need to win just to break even. A prediction market would quote the same chance as 26¢.
What +278 pays
A 100 stake at +278 returns 378.00 in total: your 100 back plus 278.00 profit. To win exactly 100 you would stake 35.97. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 27.80 | 37.80 |
| 25 | 69.50 | 94.50 |
| 50 | 139.00 | 189.00 |
| 100 | 278.00 | 378.00 |
| 500 | 1,390.00 | 1,890.00 |
| 1,000 | 2,780.00 | 3,780.00 |
Break-even and long-run results
The implied probability of +278 is 26.46%, and that number is also the break-even win rate: win more often than 26.46% 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 |
|---|---|
| 26% | -1.7% |
| 50% | 89.0% |
| 55% | 107.9% |
| 60% | 126.8% |
| 65% | 145.7% |
+278 is an underdog price: the bookmaker gives this outcome an implied chance of 26.46%, and the payout of 278.00 on 100 reflects it. Underdogs in this band are where public money and bookmaker margin often disagree, so it pays to compare prices across books before taking one.
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 -89.00% 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 3.724 decimal (+272 American); at 5% it drops to 3.641 (+264). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 3.724 | +272 | 26.85% |
| 5% | 3.641 | +264 | 27.46% |
Same price in other formats
Nearby prices
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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 26.46% and a 100 stake returns 378.00.
What is +278 in decimal odds?
+278 converts to 3.780 in decimal odds (usually shown as 3.78). Decimal odds are the total return per unit staked, so multiply your stake by 3.780 to get the return.
What is +278 as a fraction?
+278 is 139/50 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 278.00 in profit and returns 378.00 including the stake. To win exactly 100 you would stake 35.97.
What win rate do I need at +278?
The break-even win rate equals the implied probability, 26.46%. Winning more often than that at this price is profitable over the long run; winning less often loses money.