+505 Odds Explained
- Decimal
- 6.05
- American
- +505
- Fractional
- 101/20
- Implied probability
- 16.53%
- Polymarket
- 17¢
- $100 wins
- 505.00
- American
- +505
- Fractional
- 101/20
- Implied probability
- 16.53%
- Polymarket
- 17¢
- Profit
- 505.00
- Total return
- 605.00
6.050 decimal, +505 American, 16.53% implied probability
The price +505 converts to 6.05 decimal odds and 101/20 fractional odds. Read as a probability it says the bookmaker prices this outcome at 16.53%, which is the share of the time you would need to win just to break even. A prediction market would quote the same chance as 17¢.
What +505 pays
A 100 stake at +505 returns 605.00 in total: your 100 back plus 505.00 profit. To win exactly 100 you would stake 19.80. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 50.50 | 60.50 |
| 25 | 126.25 | 151.25 |
| 50 | 252.50 | 302.50 |
| 100 | 505.00 | 605.00 |
| 500 | 2,525.00 | 3,025.00 |
| 1,000 | 5,050.00 | 6,050.00 |
Break-even and long-run results
The implied probability of +505 is 16.53%, and that number is also the break-even win rate: win more often than 16.53% 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 |
|---|---|
| 17% | 2.9% |
| 50% | 202.5% |
| 55% | 232.8% |
| 60% | 263.0% |
| 65% | 293.3% |
With an implied chance of 16.53%, a bet at +505 is expected to lose most of the time and to pay 505.00 on 100 when it does not. Outright markets, correct scores and big upsets are where these prices appear, and they are the prices bookmakers shade the hardest.
The vig at +505
If both sides of a two-way market were priced at +505, the implied probabilities would add up to -66.94% above 100%. That excess is the overround, or vig; as a share of stakes it is a -202.50% 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.
+505 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission +505 is worth 5.949 decimal (+495 American); at 5% it drops to 5.797 (+480). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 5.949 | +495 | 16.81% |
| 5% | 5.797 | +480 | 17.25% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does +505 mean in betting?
+505 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At +505 the implied probability is 16.53% and a 100 stake returns 605.00.
What is +505 in decimal odds?
+505 converts to 6.050 in decimal odds (usually shown as 6.05). Decimal odds are the total return per unit staked, so multiply your stake by 6.050 to get the return.
What is +505 as a fraction?
+505 is 101/20 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 +505?
A 100 stake at +505 wins 505.00 in profit and returns 605.00 including the stake. To win exactly 100 you would stake 19.80.
What win rate do I need at +505?
The break-even win rate equals the implied probability, 16.53%. Winning more often than that at this price is profitable over the long run; winning less often loses money.