Odds calculator
+150 is 2.50 in decimal odds and 3/2 in fractional odds, and it implies a 40.0% chance of winning.
Odds say two things at once: how much a bet pays and how likely the book makes it. Type any price, in American (−110, +150), decimal (1.91), fractional (5/2) or as a prediction-market price in cents, to see it in every format, the chance it implies and what your stake pays.
2.50 in American odds
+150
- American
- +150
- Decimal
- 2.50
- Fractional
- 3/2
- Implied
- 40.0%
- Market
- 40.0¢
Decimal in Europe, Canada and Australia · fractional in the UK and Ireland · American in the US
What it pays at +150
- Stake
- $100.00
- Profit
- $150.00
- Total return
- $250.00
A bet of $66.67 wins $100.00 · Each dollar bet wins $1.50
Where +150 sits
- −30075.0%
- −20066.7%
- −15060.0%
- −11052.4%
- +10050.0%
- +15040.0%
- +20033.3%
- +30025.0%
- +50016.7%
If it really wins… (5)
| Win rate | Expected profit per $100 |
|---|---|
| 30.0% | −$25.00 |
| 35.0% | −$12.50 |
| 40.0% | $0.00 |
| 45.0% | +$12.50 |
| 50.0% | +$25.00 |
How it's worked out (3)
| Working | Result | |
|---|---|---|
| Decimal odds (F1.1) | 1 + 150 ÷ 100 | 2.50 |
| Implied chance (F1.4) | 1 ÷ 2.50 | 40.0% |
| $100.00 returns | $100.00 × 2.50 | $250.00 |
Questions about the odds calculator
How do American odds work?
A minus price is what you bet to win $100; a plus price is what a $100 bet wins. The bigger the minus number, the bigger the favorite; the bigger the plus number, the bigger the underdog.
How are American odds converted to decimal odds?
For a plus price, divide it by 100 and add 1. For a minus price, divide 100 by the price without its sign and add 1. Decimal odds are what one unit returns in all, stake included, so they multiply straight into a payout.
What are fractional odds?
Fractional odds, used in the UK and Ireland, are the profit over the stake: 5/2 wins 5 for every 2 staked. Add 1 to the fraction to get decimal odds.
What does implied probability mean?
It is the chance a price has to win to break even: one divided by the decimal odds. Both sides of a market add up to more than 100% because each price carries the book's margin; the no-vig calculator takes it out.
Which odds format is best?
They all describe the same price. US books show American odds, books in Europe, Canada and Australia show decimal, and UK and Irish books show fractional. Decimal is the easiest to multiply, which is why parlay maths uses it.