+308 Odds Explained
- Decimal
- 4.08
- American
- +308
- Fractional
- 77/25
- Implied probability
- 24.51%
- Polymarket
- 25¢
- $100 wins
- 308.00
- American
- +308
- Fractional
- 77/25
- Implied probability
- 24.51%
- Polymarket
- 25¢
- Profit
- 308.00
- Total return
- 408.00
4.080 decimal, +308 American, 24.51% implied probability
The price +308 converts to 4.08 decimal odds and 77/25 fractional odds. Read as a probability it says the bookmaker prices this outcome at 24.51%, 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 25¢.
What +308 pays
A 100 stake at +308 returns 408.00 in total: your 100 back plus 308.00 profit. To win exactly 100 you would stake 32.47. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 30.80 | 40.80 |
| 25 | 77.00 | 102.00 |
| 50 | 154.00 | 204.00 |
| 100 | 308.00 | 408.00 |
| 500 | 1,540.00 | 2,040.00 |
| 1,000 | 3,080.00 | 4,080.00 |
Break-even and long-run results
The implied probability of +308 is 24.51%, and that number is also the break-even win rate: win more often than 24.51% 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 |
|---|---|
| 25% | 2.0% |
| 50% | 104.0% |
| 55% | 124.4% |
| 60% | 144.8% |
| 65% | 165.2% |
+308 is a longshot. The bookmaker prices the outcome at 24.51%, and the payout of 308.00 per 100 staked is the compensation for how rarely it lands. Longshots carry more margin than any other part of the market, which is why devigging methods disagree most at prices like this one.
The vig at +308
If both sides of a two-way market were priced at +308, the implied probabilities would add up to -50.98% above 100%. That excess is the overround, or vig; as a share of stakes it is a -104.00% 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.
+308 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission +308 is worth 4.018 decimal (+302 American); at 5% it drops to 3.926 (+293). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 4.018 | +302 | 24.89% |
| 5% | 3.926 | +293 | 25.47% |
Same price in other formats
Nearby prices
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Frequently asked questions
What does +308 mean in betting?
+308 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At +308 the implied probability is 24.51% and a 100 stake returns 408.00.
What is +308 in decimal odds?
+308 converts to 4.080 in decimal odds (usually shown as 4.08). Decimal odds are the total return per unit staked, so multiply your stake by 4.080 to get the return.
What is +308 as a fraction?
+308 is 77/25 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 +308?
A 100 stake at +308 wins 308.00 in profit and returns 408.00 including the stake. To win exactly 100 you would stake 32.47.
What win rate do I need at +308?
The break-even win rate equals the implied probability, 24.51%. Winning more often than that at this price is profitable over the long run; winning less often loses money.