+109 Odds Explained
- Decimal
- 2.09
- American
- +109
- Fractional
- 109/100
- Implied probability
- 47.85%
- Polymarket
- 48¢
- $100 wins
- 109.00
- American
- +109
- Fractional
- 109/100
- Implied probability
- 47.85%
- Polymarket
- 48¢
- Profit
- 109.00
- Total return
- 209.00
2.090 decimal, +109 American, 47.85% implied probability
The price +109 converts to 2.09 decimal odds and 109/100 fractional odds. Read as a probability it says the bookmaker prices this outcome at 47.85%, 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 48¢.
What +109 pays
A 100 stake at +109 returns 209.00 in total: your 100 back plus 109.00 profit. To win exactly 100 you would stake 91.74. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 10.90 | 20.90 |
| 25 | 27.25 | 52.25 |
| 50 | 54.50 | 104.50 |
| 100 | 109.00 | 209.00 |
| 500 | 545.00 | 1,045.00 |
| 1,000 | 1,090.00 | 2,090.00 |
Break-even and long-run results
The implied probability of +109 is 47.85%, and that number is also the break-even win rate: win more often than 47.85% 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 |
|---|---|
| 48% | 0.3% |
| 50% | 4.5% |
| 55% | 14.9% |
| 60% | 25.4% |
| 65% | 35.8% |
An implied probability of 47.85% makes +109 a near-even price. This is the natural home of handicap and over/under markets, where the bookmaker adjusts the line rather than the price and both sides are quoted a shade under 2.00 decimal.
The vig at +109
If both sides of a two-way market were priced at +109, the implied probabilities would add up to -4.31% above 100%. That excess is the overround, or vig; as a share of stakes it is a -4.50% 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.
+109 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission +109 is worth 2.068 decimal (+107 American); at 5% it drops to 2.036 (+104). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 2.068 | +107 | 48.35% |
| 5% | 2.036 | +104 | 49.13% |
Same price in other formats
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does +109 mean in betting?
+109 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At +109 the implied probability is 47.85% and a 100 stake returns 209.00.
What is +109 in decimal odds?
+109 converts to 2.090 in decimal odds (usually shown as 2.09). Decimal odds are the total return per unit staked, so multiply your stake by 2.090 to get the return.
What is +109 as a fraction?
+109 is 109/100 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 +109?
A 100 stake at +109 wins 109.00 in profit and returns 209.00 including the stake. To win exactly 100 you would stake 91.74.
What win rate do I need at +109?
The break-even win rate equals the implied probability, 47.85%. Winning more often than that at this price is profitable over the long run; winning less often loses money.