SportsFathom Odds calculators Odds converter
Odds converter
Type a price in any box: the other three formats and the chance the price stands for fill in as you type.
How the formats relate
All four describe one price. Decimal odds are what a winning bet returns per 1 staked, the stake included: 2.50 returns 2.50 for 1. Fractional odds are the profit per stake: 3/2 wins 3 for every 2. American odds are the profit on a 100 stake when positive (+150 wins 150) and the stake needed to win 100 when negative (-110 risks 110 to win 100). The implied probability is 1 divided by the decimal odds: the win rate at which the price breaks even.
- Positive American to decimal: 1 + American / 100
- Negative American to decimal: 1 + 100 / |American|
- Decimal to implied probability: 1 / decimal
- A chance p to American: -100 × p / (1 - p) from 50% up, otherwise +100 × (1 - p) / p
Common prices
| American | Decimal | Fractional | Implied |
|---|---|---|---|
| -300 | 1.33 | 1/3 | 75.0% |
| -200 | 1.50 | 1/2 | 66.7% |
| -150 | 1.67 | 2/3 | 60.0% |
| -110 | 1.91 | 10/11 | 52.4% |
| +100 | 2.00 | 1/1 | 50.0% |
| +150 | 2.50 | 3/2 | 40.0% |
| +200 | 3.00 | 2/1 | 33.3% |
| +300 | 4.00 | 3/1 | 25.0% |
| +500 | 6.00 | 5/1 | 16.7% |
A price's implied probability includes the sportsbook's margin, so the two sides of a market add up to more than 100%. To take the margin out, use the no-vig calculator.
21+. These calculators do arithmetic on prices you enter: they are not betting advice and say nothing about who will win. SportsFathom takes no bets. Gambling problem? Call or text 1-800-GAMBLER.