+340 Odds Explained
- Decimal
- 4.40
- American
- +340
- Fractional
- 17/5
- Implied probability
- 22.73%
- Polymarket
- 23¢
- $100 wins
- 340.00
- American
- +340
- Fractional
- 17/5
- Implied probability
- 22.73%
- Polymarket
- 23¢
- Profit
- 340.00
- Total return
- 440.00
4.400 decimal, +340 American, 22.73% implied probability
The price +340 converts to 4.40 decimal odds and 17/5 fractional odds. Read as a probability it says the bookmaker prices this outcome at 22.73%, 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 23¢.
What +340 pays
A 100 stake at +340 returns 440.00 in total: your 100 back plus 340.00 profit. To win exactly 100 you would stake 29.41. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 34.00 | 44.00 |
| 25 | 85.00 | 110.00 |
| 50 | 170.00 | 220.00 |
| 100 | 340.00 | 440.00 |
| 500 | 1,700.00 | 2,200.00 |
| 1,000 | 3,400.00 | 4,400.00 |
Break-even and long-run results
The implied probability of +340 is 22.73%, and that number is also the break-even win rate: win more often than 22.73% 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 |
|---|---|
| 23% | 1.2% |
| 50% | 120.0% |
| 55% | 142.0% |
| 60% | 164.0% |
| 65% | 186.0% |
+340 is a longshot. The bookmaker prices the outcome at 22.73%, and the payout of 340.00 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 +340
If both sides of a two-way market were priced at +340, the implied probabilities would add up to -54.55% above 100%. That excess is the overround, or vig; as a share of stakes it is a -120.00% 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.
+340 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission +340 is worth 4.332 decimal (+333 American); at 5% it drops to 4.230 (+323). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 4.332 | +333 | 23.08% |
| 5% | 4.230 | +323 | 23.64% |
Same price in other formats
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does +340 mean in betting?
+340 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At +340 the implied probability is 22.73% and a 100 stake returns 440.00.
What is +340 in decimal odds?
+340 converts to 4.400 in decimal odds (usually shown as 4.40). Decimal odds are the total return per unit staked, so multiply your stake by 4.400 to get the return.
What is +340 as a fraction?
+340 is 17/5 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 +340?
A 100 stake at +340 wins 340.00 in profit and returns 440.00 including the stake. To win exactly 100 you would stake 29.41.
What win rate do I need at +340?
The break-even win rate equals the implied probability, 22.73%. Winning more often than that at this price is profitable over the long run; winning less often loses money.