-9100 Odds Explained
- Decimal
- 1.01
- American
- -9,100
- Fractional
- 1/91
- Implied probability
- 98.91%
- Polymarket
- 99¢
- $100 wins
- 1.10
- American
- -9,100
- Fractional
- 1/91
- Implied probability
- 98.91%
- Polymarket
- 99¢
- Profit
- 1.10
- Total return
- 101.10
1.011 decimal, -9,100 American, 98.91% implied probability
-9100 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: 1.01 decimal, 1/91 fractional, 98.91% implied probability, 99¢ on Polymarket.
What -9100 pays
A 100 stake at -9100 returns 101.10 in total: your 100 back plus 1.10 profit. To win exactly 100 you would stake 9,100.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 0.11 | 10.11 |
| 25 | 0.27 | 25.27 |
| 50 | 0.55 | 50.55 |
| 100 | 1.10 | 101.10 |
| 500 | 5.49 | 505.49 |
| 1,000 | 10.99 | 1,010.99 |
Break-even and long-run results
The implied probability of -9100 is 98.91%, and that number is also the break-even win rate: win more often than 98.91% 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% | -49.5% |
| 55% | -44.4% |
| 60% | -39.3% |
| 65% | -34.3% |
| 99% | 0.1% |
A price of -9100 is deep odds-on. Bookmakers quote it when an outcome is close to a formality, and the margin they take is proportionally large at this end of the market. Sharp bettors tend to look at the other side of such a market, or at the exchange, where the same favourite is often available a tick or two better.
The vig at -9100
If both sides of a two-way market were priced at -9100, the implied probabilities would add up to 97.83% above 100%. That excess is the overround, or vig; as a share of stakes it is a 49.45% 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.
-9100 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -9100 is worth 1.011 decimal (-9,286 American); at 5% it drops to 1.010 (-9,579). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.011 | -9,286 | 98.93% |
| 5% | 1.010 | -9,579 | 98.97% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -9100 mean in betting?
-9100 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -9100 the implied probability is 98.91% and a 100 stake returns 101.10.
What is -9100 in decimal odds?
-9100 converts to 1.011 in decimal odds (usually shown as 1.01). Decimal odds are the total return per unit staked, so multiply your stake by 1.011 to get the return.
What is -9100 as a fraction?
-9100 is 1/91 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 -9100?
A 100 stake at -9100 wins 1.10 in profit and returns 101.10 including the stake. To win exactly 100 you would stake 9,100.00.
What win rate do I need at -9100?
The break-even win rate equals the implied probability, 98.91%. Winning more often than that at this price is profitable over the long run; winning less often loses money.