Odds converter
Sports bettors think in −150 and 2.50. Prediction markets think in cents. Convert between them, and strip a sportsbook’s margin to see its real opinion.
Price to odds
Remove a sportsbook’s margin
The full table
| Price | Probability | American odds | Decimal odds |
|---|---|---|---|
| 5¢ | 5% | +1,900 | 20.00 |
| 10¢ | 10% | +900 | 10.00 |
| 15¢ | 15% | +567 | 6.67 |
| 20¢ | 20% | +400 | 5.00 |
| 25¢ | 25% | +300 | 4.00 |
| 30¢ | 30% | +233 | 3.33 |
| 35¢ | 35% | +186 | 2.86 |
| 40¢ | 40% | +150 | 2.50 |
| 45¢ | 45% | +122 | 2.22 |
| 50¢ | 50% | +100 / −100 | 2.00 |
| 55¢ | 55% | −122 | 1.82 |
| 60¢ | 60% | −150 | 1.67 |
| 65¢ | 65% | −186 | 1.54 |
| 70¢ | 70% | −233 | 1.43 |
| 75¢ | 75% | −300 | 1.33 |
| 80¢ | 80% | −400 | 1.25 |
| 85¢ | 85% | −567 | 1.18 |
| 90¢ | 90% | −900 | 1.11 |
| 95¢ | 95% | −1,900 | 1.05 |
A sportsbook builds a margin into both sides, so its probabilities add up to more than 100%. A prediction market price has no margin built in; the platform charges a fee instead. Compare the fair sportsbook number with the market price plus the fee.
Questions people ask
How do I convert a prediction market price to American odds?
For a price under 50¢: (100 − price) ÷ price × 100, as a plus number. 40¢ is +150. For 50¢ and up: price ÷ (100 − price) × 100, as a minus number. 60¢ is −150.
How do I remove the vig from sportsbook odds?
Turn each side’s odds into a probability, add them up, and divide each side by the total. −150 and +130 are 60.0% and 43.5%, a total of 103.5%; with the margin removed they are 58.0% and 42.0%.
Why compare with a sharp sportsbook?
Sharp books take big bets from the best bettors and move their prices fast, so their numbers with the margin removed are among the most accurate probabilities you can get for a game.
The whole method is in the book
These tools come from 62% Chance, a plain-English guide for beginners by Armando Acevedo, who spent 25 years setting prices for sportsbooks. It follows one new trader from her first look at a price to a tested plan: fees, the order book, borrowing a sportsbook’s sharp prices, bet size, scams, taxes and when to stop.
