+100 Odds (Even Money) Explained
- Decimal
- 2.00
- American
- +100
- Fractional
- evens
- Implied probability
- 50.00%
- Polymarket
- 50¢
- $100 wins
- 100.00
- American
- +100
- Fractional
- evens
- Implied probability
- 50.00%
- Polymarket
- 50¢
- Profit
- 100.00
- Total return
- 200.00
2.000 decimal, +100 American, 50.00% implied probability
+100 is even money: risk 100 to win 100, decimal 2.00, fractional evens, a 50% implied probability. It is also written -100, which means exactly the same thing; +100 is the canonical spelling.
Even money appears as a headline price on pick'em games and as the fair price hidden inside a -110 / -110 market. Devigging a symmetric spread market always lands on +100 on each side.
What +100 pays
A 100 stake at +100 returns 200.00 in total: your 100 back plus 100.00 profit. To win exactly 100 you would stake 100.00. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 10.00 | 20.00 |
| 25 | 25.00 | 50.00 |
| 50 | 50.00 | 100.00 |
| 100 | 100.00 | 200.00 |
| 500 | 500.00 | 1,000.00 |
| 1,000 | 1,000.00 | 2,000.00 |
Break-even and long-run results
The implied probability of +100 is 50.00%, and that number is also the break-even win rate: win more often than 50.00% 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% | 0.0% |
| 55% | 10.0% |
| 60% | 20.0% |
| 65% | 30.0% |
+100 sits close to even money. The bookmaker sees this as roughly a coin flip, with the margin nudging both sides of the market a little under fair. Point spreads and totals live here: the line moves to make each side about a 50% proposition, and the price carries the juice.
The vig at +100
Even money has no margin built in on its own: two outcomes at +100 each imply exactly 50% and add up to 100%. A real market with both sides at +100 would be a bookmaker giving away its edge, which is why you see -105 or -110 on each side instead.
+100 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission +100 is worth 1.980 decimal (-102 American); at 5% it drops to 1.950 (-105). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 1.980 | -102 | 50.51% |
| 5% | 1.950 | -105 | 51.28% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does +100 mean in betting?
+100 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At +100 the implied probability is 50.00% and a 100 stake returns 200.00.
What is +100 in decimal odds?
+100 converts to 2.000 in decimal odds (usually shown as 2.00). Decimal odds are the total return per unit staked, so multiply your stake by 2.000 to get the return.
What is +100 as a fraction?
+100 is evens 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 +100?
A 100 stake at +100 wins 100.00 in profit and returns 200.00 including the stake. To win exactly 100 you would stake 100.00.
What win rate do I need at +100?
The break-even win rate equals the implied probability, 50.00%. Winning more often than that at this price is profitable over the long run; winning less often loses money.