-900 Odds Explained
- Decimal
- 1.11
- American
- -900
- Fractional
- 1/9
- Implied probability
- 90.00%
- Polymarket
- 90¢
- $100 wins
- 11.11
- American
- -900
- Fractional
- 1/9
- Implied probability
- 90.00%
- Polymarket
- 90¢
- Profit
- 11.11
- Total return
- 111.11
1.111 decimal, -900 American, 90.00% implied probability
-900 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: 1.11 decimal, 1/9 fractional, 90.00% implied probability, 90¢ on Polymarket.
What -900 pays
A 100 stake at -900 returns 111.11 in total: your 100 back plus 11.11 profit. To win exactly 100 you would stake 900.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 1.11 | 11.11 |
| 25 | 2.78 | 27.78 |
| 50 | 5.56 | 55.56 |
| 100 | 11.11 | 111.11 |
| 500 | 55.56 | 555.56 |
| 1,000 | 111.11 | 1,111.11 |
Break-even and long-run results
The implied probability of -900 is 90.00%, and that number is also the break-even win rate: win more often than 90.00% 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% | -44.4% |
| 55% | -38.9% |
| 60% | -33.3% |
| 65% | -27.8% |
| 90% | 0.0% |
At 90.00% this is a heavy favourite. Prices this short appear when one side is expected to win comfortably: a top seed against a qualifier, a strong home team against a relegation candidate, or a moneyline in a game with a double-digit spread. The catch is the payout. You need to win more than 90.00% of these bets just to stand still, and one loss wipes out several wins.
The vig at -900
If both sides of a two-way market were priced at -900, the implied probabilities would add up to 80.00% above 100%. That excess is the overround, or vig; as a share of stakes it is a 44.44% 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.
-900 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -900 is worth 1.109 decimal (-918 American); at 5% it drops to 1.106 (-947). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.109 | -918 | 90.18% |
| 5% | 1.106 | -947 | 90.45% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -900 mean in betting?
-900 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -900 the implied probability is 90.00% and a 100 stake returns 111.11.
What is -900 in decimal odds?
-900 converts to 1.111 in decimal odds (usually shown as 1.11). Decimal odds are the total return per unit staked, so multiply your stake by 1.111 to get the return.
What is -900 as a fraction?
-900 is 1/9 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 -900?
A 100 stake at -900 wins 11.11 in profit and returns 111.11 including the stake. To win exactly 100 you would stake 900.00.
What win rate do I need at -900?
The break-even win rate equals the implied probability, 90.00%. Winning more often than that at this price is profitable over the long run; winning less often loses money.