-108 Odds Explained
- Decimal
- 1.93
- American
- -108
- Fractional
- 25/27
- Implied probability
- 51.92%
- Polymarket
- 52¢
- $100 wins
- 92.59
- American
- -108
- Fractional
- 25/27
- Implied probability
- 51.92%
- Polymarket
- 52¢
- Profit
- 92.59
- Total return
- 192.59
1.926 decimal, -108 American, 51.92% implied probability
-108 is an American price:
the minus sign marks a favourite, and the number is the stake needed to win 100
. Every other format describes the same chance: 1.93 decimal, 25/27 fractional, 51.92% implied probability, 52¢ on Polymarket.
What -108 pays
A 100 stake at -108 returns 192.59 in total: your 100 back plus 92.59 profit. To win exactly 100 you would stake 108.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 9.26 | 19.26 |
| 25 | 23.15 | 48.15 |
| 50 | 46.30 | 96.30 |
| 100 | 92.59 | 192.59 |
| 500 | 462.96 | 962.96 |
| 1,000 | 925.93 | 1,925.93 |
Break-even and long-run results
The implied probability of -108 is 51.92%, and that number is also the break-even win rate: win more often than 51.92% 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 |
|---|---|
| 50% | -3.7% |
| 52% | 0.1% |
| 55% | 5.9% |
| 60% | 15.6% |
| 65% | 25.2% |
An implied probability of 51.92% makes -108 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 -108
If both sides of a two-way market were priced at -108, the implied probabilities would add up to 3.85% above 100%. That excess is the overround, or vig; as a share of stakes it is a 3.70% 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.
-108 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -108 is worth 1.907 decimal (-110 American); at 5% it drops to 1.880 (-114). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.907 | -110 | 52.43% |
| 5% | 1.880 | -114 | 53.20% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -108 mean in betting?
-108 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -108 the implied probability is 51.92% and a 100 stake returns 192.59.
What is -108 in decimal odds?
-108 converts to 1.926 in decimal odds (usually shown as 1.93). Decimal odds are the total return per unit staked, so multiply your stake by 1.926 to get the return.
What is -108 as a fraction?
-108 is 25/27 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 -108?
A 100 stake at -108 wins 92.59 in profit and returns 192.59 including the stake. To win exactly 100 you would stake 108.00.
What win rate do I need at -108?
The break-even win rate equals the implied probability, 51.92%. Winning more often than that at this price is profitable over the long run; winning less often loses money.