+900 Odds Explained
- Decimal
- 10.00
- American
- +900
- Fractional
- 9/1
- Implied probability
- 10.00%
- Polymarket
- 10¢
- $100 wins
- 900.00
- American
- +900
- Fractional
- 9/1
- Implied probability
- 10.00%
- Polymarket
- 10¢
- Profit
- 900.00
- Total return
- 1,000.00
10.000 decimal, +900 American, 10.00% implied probability
American odds of +900 mean
a 100 stake wins 900
. In decimal notation that is 10.00, in fractional notation 9/1, and the implied probability is 10.00%. On a prediction market the same price is a 10¢ share.
What +900 pays
A 100 stake at +900 returns 1,000.00 in total: your 100 back plus 900.00 profit. To win exactly 100 you would stake 11.11. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 90.00 | 100.00 |
| 25 | 225.00 | 250.00 |
| 50 | 450.00 | 500.00 |
| 100 | 900.00 | 1,000.00 |
| 500 | 4,500.00 | 5,000.00 |
| 1,000 | 9,000.00 | 10,000.00 |
Break-even and long-run results
The implied probability of +900 is 10.00%, and that number is also the break-even win rate: win more often than 10.00% 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 |
|---|---|
| 10% | 0.0% |
| 50% | 400.0% |
| 55% | 450.0% |
| 60% | 500.0% |
| 65% | 550.0% |
+900 is a longshot. The bookmaker prices the outcome at 10.00%, and the payout of 900.00 per 100 staked is the compensation for how rarely it lands. Longshots carry more margin than any other part of the market, which is why devigging methods disagree most at prices like this one.
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 -400.00% 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 9.820 decimal (+882 American); at 5% it drops to 9.550 (+855). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 9.820 | +882 | 10.18% |
| 5% | 9.550 | +855 | 10.47% |
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 10.00% and a 100 stake returns 1,000.00.
What is +900 in decimal odds?
+900 converts to 10.000 in decimal odds (usually shown as 10.00). Decimal odds are the total return per unit staked, so multiply your stake by 10.000 to get the return.
What is +900 as a fraction?
+900 is 9/1 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 900.00 in profit and returns 1,000.00 including the stake. To win exactly 100 you would stake 11.11.
What win rate do I need at +900?
The break-even win rate equals the implied probability, 10.00%. Winning more often than that at this price is profitable over the long run; winning less often loses money.