-170 Odds Explained
- Decimal
- 1.59
- American
- -170
- Fractional
- 10/17
- Implied probability
- 62.96%
- Polymarket
- 63¢
- $100 wins
- 58.82
- American
- -170
- Fractional
- 10/17
- Implied probability
- 62.96%
- Polymarket
- 63¢
- Profit
- 58.82
- Total return
- 158.82
1.588 decimal, -170 American, 62.96% implied probability
American odds of -170 mean
you risk 170 to win 100
. In decimal notation that is 1.59, in fractional notation 10/17, and the implied probability is 62.96%. On a prediction market the same price is a 63¢ share.
What -170 pays
A 100 stake at -170 returns 158.82 in total: your 100 back plus 58.82 profit. To win exactly 100 you would stake 170.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 5.88 | 15.88 |
| 25 | 14.71 | 39.71 |
| 50 | 29.41 | 79.41 |
| 100 | 58.82 | 158.82 |
| 500 | 294.12 | 794.12 |
| 1,000 | 588.24 | 1,588.24 |
Break-even and long-run results
The implied probability of -170 is 62.96%, and that number is also the break-even win rate: win more often than 62.96% 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% | -20.6% |
| 55% | -12.6% |
| 60% | -4.7% |
| 63% | 0.1% |
| 65% | 3.2% |
-170 marks a clear favourite without being a lock: the implied chance is 62.96%, so the bookmaker expects this outcome roughly two times in three. Moneylines on the better team in an evenly scheduled league, the higher-ranked tennis player, or the "under" in a low-total game are typical places to see it.
The vig at -170
If both sides of a two-way market were priced at -170, the implied probabilities would add up to 25.93% above 100%. That excess is the overround, or vig; as a share of stakes it is a 20.59% 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.
-170 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission -170 is worth 1.576 decimal (-173 American); at 5% it drops to 1.559 (-179). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.576 | -173 | 63.43% |
| 5% | 1.559 | -179 | 64.15% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does -170 mean in betting?
-170 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At -170 the implied probability is 62.96% and a 100 stake returns 158.82.
What is -170 in decimal odds?
-170 converts to 1.588 in decimal odds (usually shown as 1.59). Decimal odds are the total return per unit staked, so multiply your stake by 1.588 to get the return.
What is -170 as a fraction?
-170 is 10/17 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 -170?
A 100 stake at -170 wins 58.82 in profit and returns 158.82 including the stake. To win exactly 100 you would stake 170.00.
What win rate do I need at -170?
The break-even win rate equals the implied probability, 62.96%. Winning more often than that at this price is profitable over the long run; winning less often loses money.