-103 Odds Explained
- Decimal
- 1.97
- American
- -103
- Fractional
- 67/69
- Implied probability
- 50.74%
- Polymarket
- 51¢
- $100 wins
- 97.09
- The fraction shown is the closest simple fraction to the odds rounded to 3 decimals, not an exact match.
- American
- -103
- Fractional
- 67/69
- Implied probability
- 50.74%
- Polymarket
- 51¢
- Profit
- 97.09
- Total return
- 197.09
1.971 decimal, -103 American, 50.74% implied probability
American odds of -103 mean
you risk 103 to win 100
. In decimal notation that is 1.97, in fractional notation 67/69, and the implied probability is 50.74%. On a prediction market the same price is a 51¢ share.
What -103 pays
A 100 stake at -103 returns 197.09 in total: your 100 back plus 97.09 profit. To win exactly 100 you would stake 103.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 9.71 | 19.71 |
| 25 | 24.27 | 49.27 |
| 50 | 48.54 | 98.54 |
| 100 | 97.09 | 197.09 |
| 500 | 485.44 | 985.44 |
| 1,000 | 970.87 | 1,970.87 |
Break-even and long-run results
The implied probability of -103 is 50.74%, and that number is also the break-even win rate: win more often than 50.74% 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% | -1.5% |
| 51% | 0.5% |
| 55% | 8.4% |
| 60% | 18.3% |
| 65% | 28.1% |
-103 sits close to even money. The bookmaker sees this as roughly a coin flip, with the margin nudging both sides of the market a little under fair. Point spreads and totals live here: the line moves to make each side about a 50% proposition, and the price carries the juice.
The vig at -103
If both sides of a two-way market were priced at -103, the implied probabilities would add up to 1.48% above 100%. That excess is the overround, or vig; as a share of stakes it is a 1.46% 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.
-103 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -103 is worth 1.951 decimal (-105 American); at 5% it drops to 1.922 (-108). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.951 | -105 | 51.24% |
| 5% | 1.922 | -108 | 52.02% |
Same price in other formats
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -103 mean in betting?
-103 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -103 the implied probability is 50.74% and a 100 stake returns 197.09.
What is -103 in decimal odds?
-103 converts to 1.971 in decimal odds (usually shown as 1.97). Decimal odds are the total return per unit staked, so multiply your stake by 1.971 to get the return.
What is -103 as a fraction?
-103 is 67/69 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 -103?
A 100 stake at -103 wins 97.09 in profit and returns 197.09 including the stake. To win exactly 100 you would stake 103.00.
What win rate do I need at -103?
The break-even win rate equals the implied probability, 50.74%. Winning more often than that at this price is profitable over the long run; winning less often loses money.