-488 Odds Explained
- Decimal
- 1.20
- American
- -488
- Fractional
- 17/83
- Implied probability
- 82.99%
- Polymarket
- 83¢
- $100 wins
- 20.49
- The fraction shown is the closest simple fraction to the odds rounded to 3 decimals, not an exact match.
- American
- -488
- Fractional
- 17/83
- Implied probability
- 82.99%
- Polymarket
- 83¢
- Profit
- 20.49
- Total return
- 120.49
1.205 decimal, -488 American, 82.99% implied probability
-488 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: 1.20 decimal, 17/83 fractional, 82.99% implied probability, 83¢ on Polymarket.
What -488 pays
A 100 stake at -488 returns 120.49 in total: your 100 back plus 20.49 profit. To win exactly 100 you would stake 488.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 2.05 | 12.05 |
| 25 | 5.12 | 30.12 |
| 50 | 10.25 | 60.25 |
| 100 | 20.49 | 120.49 |
| 500 | 102.46 | 602.46 |
| 1,000 | 204.92 | 1,204.92 |
Break-even and long-run results
The implied probability of -488 is 82.99%, and that number is also the break-even win rate: win more often than 82.99% 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% | -33.7% |
| 60% | -27.7% |
| 65% | -21.7% |
| 83% | 0.0% |
A price of -488 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 -488
If both sides of a two-way market were priced at -488, the implied probabilities would add up to 65.99% above 100%. That excess is the overround, or vig; as a share of stakes it is a 39.75% 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.
-488 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -488 is worth 1.201 decimal (-498 American); at 5% it drops to 1.195 (-514). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.201 | -498 | 83.28% |
| 5% | 1.195 | -514 | 83.70% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -488 mean in betting?
-488 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -488 the implied probability is 82.99% and a 100 stake returns 120.49.
What is -488 in decimal odds?
-488 converts to 1.205 in decimal odds (usually shown as 1.20). Decimal odds are the total return per unit staked, so multiply your stake by 1.205 to get the return.
What is -488 as a fraction?
-488 is 17/83 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 -488?
A 100 stake at -488 wins 20.49 in profit and returns 120.49 including the stake. To win exactly 100 you would stake 488.00.
What win rate do I need at -488?
The break-even win rate equals the implied probability, 82.99%. Winning more often than that at this price is profitable over the long run; winning less often loses money.