-123 Odds Explained
- Decimal
- 1.81
- American
- -123
- Fractional
- 74/91
- Implied probability
- 55.16%
- Polymarket
- 55¢
- $100 wins
- 81.30
- The fraction shown is the closest simple fraction to the odds rounded to 3 decimals, not an exact match.
- American
- -123
- Fractional
- 74/91
- Implied probability
- 55.16%
- Polymarket
- 55¢
- Profit
- 81.30
- Total return
- 181.30
1.813 decimal, -123 American, 55.16% implied probability
-123 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: 1.81 decimal, 74/91 fractional, 55.16% implied probability, 55¢ on Polymarket.
What -123 pays
A 100 stake at -123 returns 181.30 in total: your 100 back plus 81.30 profit. To win exactly 100 you would stake 123.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 8.13 | 18.13 |
| 25 | 20.33 | 45.33 |
| 50 | 40.65 | 90.65 |
| 100 | 81.30 | 181.30 |
| 500 | 406.50 | 906.50 |
| 1,000 | 813.01 | 1,813.01 |
Break-even and long-run results
The implied probability of -123 is 55.16%, and that number is also the break-even win rate: win more often than 55.16% 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% | -9.3% |
| 55% | -0.3% |
| 60% | 8.8% |
| 65% | 17.8% |
-123 marks a clear favourite without being a lock: the implied chance is 55.16%, 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 -123
If both sides of a two-way market were priced at -123, the implied probabilities would add up to 10.31% above 100%. That excess is the overround, or vig; as a share of stakes it is a 9.35% 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.
-123 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -123 is worth 1.797 decimal (-126 American); at 5% it drops to 1.772 (-129). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.797 | -126 | 55.66% |
| 5% | 1.772 | -129 | 56.42% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -123 mean in betting?
-123 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -123 the implied probability is 55.16% and a 100 stake returns 181.30.
What is -123 in decimal odds?
-123 converts to 1.813 in decimal odds (usually shown as 1.81). Decimal odds are the total return per unit staked, so multiply your stake by 1.813 to get the return.
What is -123 as a fraction?
-123 is 74/91 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 -123?
A 100 stake at -123 wins 81.30 in profit and returns 181.30 including the stake. To win exactly 100 you would stake 123.00.
What win rate do I need at -123?
The break-even win rate equals the implied probability, 55.16%. Winning more often than that at this price is profitable over the long run; winning less often loses money.