Odds Converter
Convert between American, decimal, and fractional odds instantly.
Enter odds in any format above — the others update instantly.
Odds formats explained
American Odds
Positive numbers (+150) show profit on a $100 stake. Negative numbers (-110) show how much you must stake to win $100. Most common in North America.
Decimal Odds
The total payout per $1 staked, including your stake. Decimal 2.50 on a $100 bet returns $250 total ($150 profit). Used in Europe, Canada, and Australia.
Fractional Odds
Shows profit relative to stake. 3/2 means $3 profit for every $2 staked. Traditional in the UK. Implied probability = denominator ÷ (numerator + denominator).
Frequently asked questions
How do you convert American odds to decimal?
For positive American odds, decimal = (odds ÷ 100) + 1, so +150 becomes 2.50. For negative American odds, decimal = (100 ÷ |odds|) + 1, so -110 becomes 1.909. This converter does it automatically as you type.
How do you convert decimal odds to American?
When decimal odds are 2.00 or higher, American = (decimal − 1) × 100. When they are below 2.00, American = −100 ÷ (decimal − 1). For example, decimal 2.50 is +150 and decimal 1.50 is −200.
What is implied probability?
Implied probability is the break-even win rate an odds price reflects. From decimal odds it is simply 1 ÷ decimal. Decimal 2.50 implies a 40% chance. Comparing implied probability to your own estimate is how you spot value.
Are American, decimal, and fractional odds the same?
Yes — they are three formats for the same price. American is common in the US, decimal in Europe, Canada and Australia, and fractional in the UK. This converter shows all three plus the implied probability side by side.