+318 Odds Explained
- Decimal
- 4.18
- American
- +318
- Fractional
- 159/50
- Implied probability
- 23.92%
- Polymarket
- 24¢
- $100 wins
- 318.00
- American
- +318
- Fractional
- 159/50
- Implied probability
- 23.92%
- Polymarket
- 24¢
- Profit
- 318.00
- Total return
- 418.00
4.180 decimal, +318 American, 23.92% implied probability
+318 is an American price:
the plus sign marks an underdog, and the number is the profit on a 100 stake
. Every other format describes the same chance: 4.18 decimal, 159/50 fractional, 23.92% implied probability, 24¢ on Polymarket.
What +318 pays
A 100 stake at +318 returns 418.00 in total: your 100 back plus 318.00 profit. To win exactly 100 you would stake 31.45. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 31.80 | 41.80 |
| 25 | 79.50 | 104.50 |
| 50 | 159.00 | 209.00 |
| 100 | 318.00 | 418.00 |
| 500 | 1,590.00 | 2,090.00 |
| 1,000 | 3,180.00 | 4,180.00 |
Break-even and long-run results
The implied probability of +318 is 23.92%, and that number is also the break-even win rate: win more often than 23.92% 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 |
|---|---|
| 24% | 0.3% |
| 50% | 109.0% |
| 55% | 129.9% |
| 60% | 150.8% |
| 65% | 171.7% |
With an implied chance of 23.92%, a bet at +318 is expected to lose most of the time and to pay 318.00 on 100 when it does not. Outright markets, correct scores and big upsets are where these prices appear, and they are the prices bookmakers shade the hardest.
The vig at +318
If both sides of a two-way market were priced at +318, the implied probabilities would add up to -52.15% above 100%. That excess is the overround, or vig; as a share of stakes it is a -109.00% 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.
+318 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission +318 is worth 4.116 decimal (+312 American); at 5% it drops to 4.021 (+302). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 4.116 | +312 | 24.29% |
| 5% | 4.021 | +302 | 24.87% |
Same price in other formats
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does +318 mean in betting?
+318 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At +318 the implied probability is 23.92% and a 100 stake returns 418.00.
What is +318 in decimal odds?
+318 converts to 4.180 in decimal odds (usually shown as 4.18). Decimal odds are the total return per unit staked, so multiply your stake by 4.180 to get the return.
What is +318 as a fraction?
+318 is 159/50 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 +318?
A 100 stake at +318 wins 318.00 in profit and returns 418.00 including the stake. To win exactly 100 you would stake 31.45.
What win rate do I need at +318?
The break-even win rate equals the implied probability, 23.92%. Winning more often than that at this price is profitable over the long run; winning less often loses money.