-491 Odds Explained
- Decimal
- 1.20
- American
- -491
- Fractional
- 11/54
- Implied probability
- 83.08%
- Polymarket
- 83¢
- $100 wins
- 20.37
- The fraction shown is the closest simple fraction to the odds rounded to 3 decimals, not an exact match.
- American
- -491
- Fractional
- 11/54
- Implied probability
- 83.08%
- Polymarket
- 83¢
- Profit
- 20.37
- Total return
- 120.37
1.204 decimal, -491 American, 83.08% implied probability
American odds of -491 mean
you risk 491 to win 100
. In decimal notation that is 1.20, in fractional notation 11/54, and the implied probability is 83.08%. On a prediction market the same price is a 83¢ share.
What -491 pays
A 100 stake at -491 returns 120.37 in total: your 100 back plus 20.37 profit. To win exactly 100 you would stake 491.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 2.04 | 12.04 |
| 25 | 5.09 | 30.09 |
| 50 | 10.18 | 60.18 |
| 100 | 20.37 | 120.37 |
| 500 | 101.83 | 601.83 |
| 1,000 | 203.67 | 1,203.67 |
Break-even and long-run results
The implied probability of -491 is 83.08%, and that number is also the break-even win rate: win more often than 83.08% 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% | -39.8% |
| 55% | -33.8% |
| 60% | -27.8% |
| 65% | -21.8% |
| 83% | -0.1% |
A price of -491 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 -491
If both sides of a two-way market were priced at -491, the implied probabilities would add up to 66.16% above 100%. That excess is the overround, or vig; as a share of stakes it is a 39.82% 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.
-491 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -491 is worth 1.200 decimal (-501 American); at 5% it drops to 1.193 (-517). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.200 | -501 | 83.36% |
| 5% | 1.193 | -517 | 83.79% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -491 mean in betting?
-491 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -491 the implied probability is 83.08% and a 100 stake returns 120.37.
What is -491 in decimal odds?
-491 converts to 1.204 in decimal odds (usually shown as 1.20). Decimal odds are the total return per unit staked, so multiply your stake by 1.204 to get the return.
What is -491 as a fraction?
-491 is 11/54 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 -491?
A 100 stake at -491 wins 20.37 in profit and returns 120.37 including the stake. To win exactly 100 you would stake 491.00.
What win rate do I need at -491?
The break-even win rate equals the implied probability, 83.08%. Winning more often than that at this price is profitable over the long run; winning less often loses money.