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Free calculator
Odds converter and implied probability
Convert American and decimal odds, and see the implied probability each price carries.
Type +150 or 2.50. Both work.
Enter American (-110, +150) or decimal (2.50) odds.
Your numbers
Results
American
+150
Decimal
2.500
Fractional
3/2
Implied probability
40.00%
How it works
American odds show profit on $100 (positive) or the stake needed to win $100 (negative). Decimal odds are what $1 pays back in total, stake included. Implied probability is the break-even win rate, including the book's margin.
Example
+150 is 2.50 in decimal odds and 3/2 in fractional odds, and implies a 40.00% chance.
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Keep going
- Glossary
Odds formats
American (+150, -110), decimal (2.50) and fractional (3/2) odds show the same price three ways.
- Glossary
Implied probability
The chance a price suggests. A price of -150 implies a 60% chance before the book's margin is taken out.
Calculators show math, not advice. Antic never places bets. Bet only where it is legal for you.