-181 Odds Explained
- Decimal
- 1.55
- American
- -181
- Fractional
- 21/38
- Implied probability
- 64.41%
- Polymarket
- 64¢
- $100 wins
- 55.25
- The fraction shown is the closest simple fraction to the odds rounded to 3 decimals, not an exact match.
- American
- -181
- Fractional
- 21/38
- Implied probability
- 64.41%
- Polymarket
- 64¢
- Profit
- 55.25
- Total return
- 155.25
1.552 decimal, -181 American, 64.41% implied probability
The price -181 converts to 1.55 decimal odds and 21/38 fractional odds. Read as a probability it says the bookmaker prices this outcome at 64.41%, 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 64¢.
What -181 pays
A 100 stake at -181 returns 155.25 in total: your 100 back plus 55.25 profit. To win exactly 100 you would stake 181.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 5.52 | 15.52 |
| 25 | 13.81 | 38.81 |
| 50 | 27.62 | 77.62 |
| 100 | 55.25 | 155.25 |
| 500 | 276.24 | 776.24 |
| 1,000 | 552.49 | 1,552.49 |
Break-even and long-run results
The implied probability of -181 is 64.41%, and that number is also the break-even win rate: win more often than 64.41% 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% | -22.4% |
| 55% | -14.6% |
| 60% | -6.9% |
| 64% | -0.6% |
| 65% | 0.9% |
-181 marks a clear favourite without being a lock: the implied chance is 64.41%, 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 -181
If both sides of a two-way market were priced at -181, the implied probabilities would add up to 28.83% above 100%. That excess is the overround, or vig; as a share of stakes it is a 22.38% 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.
-181 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -181 is worth 1.541 decimal (-185 American); at 5% it drops to 1.525 (-191). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.541 | -185 | 64.87% |
| 5% | 1.525 | -191 | 65.58% |
Same price in other formats
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -181 mean in betting?
-181 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -181 the implied probability is 64.41% and a 100 stake returns 155.25.
What is -181 in decimal odds?
-181 converts to 1.552 in decimal odds (usually shown as 1.55). Decimal odds are the total return per unit staked, so multiply your stake by 1.552 to get the return.
What is -181 as a fraction?
-181 is 21/38 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 -181?
A 100 stake at -181 wins 55.25 in profit and returns 155.25 including the stake. To win exactly 100 you would stake 181.00.
What win rate do I need at -181?
The break-even win rate equals the implied probability, 64.41%. Winning more often than that at this price is profitable over the long run; winning less often loses money.