-231 Odds Explained
- Decimal
- 1.43
- American
- -231
- Fractional
- 29/67
- Implied probability
- 69.79%
- Polymarket
- 70¢
- $100 wins
- 43.29
- The fraction shown is the closest simple fraction to the odds rounded to 3 decimals, not an exact match.
- American
- -231
- Fractional
- 29/67
- Implied probability
- 69.79%
- Polymarket
- 70¢
- Profit
- 43.29
- Total return
- 143.29
1.433 decimal, -231 American, 69.79% implied probability
-231 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: 1.43 decimal, 29/67 fractional, 69.79% implied probability, 70¢ on Polymarket.
What -231 pays
A 100 stake at -231 returns 143.29 in total: your 100 back plus 43.29 profit. To win exactly 100 you would stake 231.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 4.33 | 14.33 |
| 25 | 10.82 | 35.82 |
| 50 | 21.65 | 71.65 |
| 100 | 43.29 | 143.29 |
| 500 | 216.45 | 716.45 |
| 1,000 | 432.90 | 1,432.90 |
Break-even and long-run results
The implied probability of -231 is 69.79%, and that number is also the break-even win rate: win more often than 69.79% 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% | -28.4% |
| 55% | -21.2% |
| 60% | -14.0% |
| 65% | -6.9% |
| 70% | 0.3% |
-231 marks a clear favourite without being a lock: the implied chance is 69.79%, so the bookmaker expects this outcome roughly two times in three. Moneylines on the better team in an evenly scheduled league, the higher-ranked tennis player, or the "under" in a low-total game are typical places to see it.
The vig at -231
If both sides of a two-way market were priced at -231, the implied probabilities would add up to 39.58% above 100%. That excess is the overround, or vig; as a share of stakes it is a 28.35% 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.
-231 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -231 is worth 1.424 decimal (-236 American); at 5% it drops to 1.411 (-243). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.424 | -236 | 70.21% |
| 5% | 1.411 | -243 | 70.86% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -231 mean in betting?
-231 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -231 the implied probability is 69.79% and a 100 stake returns 143.29.
What is -231 in decimal odds?
-231 converts to 1.433 in decimal odds (usually shown as 1.43). Decimal odds are the total return per unit staked, so multiply your stake by 1.433 to get the return.
What is -231 as a fraction?
-231 is 29/67 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 -231?
A 100 stake at -231 wins 43.29 in profit and returns 143.29 including the stake. To win exactly 100 you would stake 231.00.
What win rate do I need at -231?
The break-even win rate equals the implied probability, 69.79%. Winning more often than that at this price is profitable over the long run; winning less often loses money.