-270 Odds Explained
- Decimal
- 1.37
- American
- -270
- Fractional
- 10/27
- Implied probability
- 72.97%
- Polymarket
- 73¢
- $100 wins
- 37.04
- American
- -270
- Fractional
- 10/27
- Implied probability
- 72.97%
- Polymarket
- 73¢
- Profit
- 37.04
- Total return
- 137.04
1.370 decimal, -270 American, 72.97% implied probability
The price -270 converts to 1.37 decimal odds and 10/27 fractional odds. Read as a probability it says the bookmaker prices this outcome at 72.97%, 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 73¢.
What -270 pays
A 100 stake at -270 returns 137.04 in total: your 100 back plus 37.04 profit. To win exactly 100 you would stake 270.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 3.70 | 13.70 |
| 25 | 9.26 | 34.26 |
| 50 | 18.52 | 68.52 |
| 100 | 37.04 | 137.04 |
| 500 | 185.19 | 685.19 |
| 1,000 | 370.37 | 1,370.37 |
Break-even and long-run results
The implied probability of -270 is 72.97%, and that number is also the break-even win rate: win more often than 72.97% 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% | -31.5% |
| 55% | -24.6% |
| 60% | -17.8% |
| 65% | -10.9% |
| 73% | 0.0% |
With an implied probability of 72.97%, -270 is a moderate favourite. Prices in this band are where the bookmaker's margin is easiest to see: the opposite side of the market is usually priced a little longer than the fair line, and the two implied probabilities add up to more than 100%.
The vig at -270
If both sides of a two-way market were priced at -270, the implied probabilities would add up to 45.95% above 100%. That excess is the overround, or vig; as a share of stakes it is a 31.48% 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.
-270 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -270 is worth 1.363 decimal (-276 American); at 5% it drops to 1.352 (-284). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.363 | -276 | 73.37% |
| 5% | 1.352 | -284 | 73.97% |
Same price in other formats
Nearby prices
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Frequently asked questions
What does -270 mean in betting?
-270 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -270 the implied probability is 72.97% and a 100 stake returns 137.04.
What is -270 in decimal odds?
-270 converts to 1.370 in decimal odds (usually shown as 1.37). Decimal odds are the total return per unit staked, so multiply your stake by 1.370 to get the return.
What is -270 as a fraction?
-270 is 10/27 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 -270?
A 100 stake at -270 wins 37.04 in profit and returns 137.04 including the stake. To win exactly 100 you would stake 270.00.
What win rate do I need at -270?
The break-even win rate equals the implied probability, 72.97%. Winning more often than that at this price is profitable over the long run; winning less often loses money.