How do you convert American odds to decimal?

For a positive price, divide by 100 and add 1: +150 becomes 2.50. For a negative price, divide 100 by the absolute value and add 1: -110 becomes 1.909.

You stake 110 to win 100. It is the standard price on a spread or a total, and it implies a 52.4% chance — the 2.4 points above an even 50% is how the book charges for taking the bet.

How do you work out implied probability?

Divide 1 by the decimal odds: 2.50 implies 40%. That figure includes the bookmaker's margin, so the probability the book is really working with is a little lower.

Odds converter

Enter a price in any format and get the others, plus the probability it implies. American is standard in the United States, decimal across Europe and Australia, fractional in British racing — the same price written three ways.

American oddsNegative for a favourite, positive for an underdog.

American: -110
Decimal: 1.909
Fractional: 10/11
Implied probability: 52.4%

Common questions

How do you convert American odds to decimal?: For a positive price, divide by 100 and add 1: +150 becomes 2.50. For a negative price, divide 100 by the absolute value and add 1: -110 becomes 1.909.
What does -110 mean?: You stake 110 to win 100. It is the standard price on a spread or a total, and it implies a 52.4% chance — the 2.4 points above an even 50% is how the book charges for taking the bet.
How do you work out implied probability?: Divide 1 by the decimal odds: 2.50 implies 40%. That figure includes the bookmaker's margin, so the probability the book is really working with is a little lower.

Odds converter

American oddsNegative for a favourite, positive for an underdog.

American: -110
Decimal: 1.909
Fractional: 10/11
Implied probability: 52.4%

Common questions

How do you convert American odds to decimal?: For a positive price, divide by 100 and add 1: +150 becomes 2.50. For a negative price, divide 100 by the absolute value and add 1: -110 becomes 1.909.
What does -110 mean?: You stake 110 to win 100. It is the standard price on a spread or a total, and it implies a 52.4% chance — the 2.4 points above an even 50% is how the book charges for taking the bet.
How do you work out implied probability?: Divide 1 by the decimal odds: 2.50 implies 40%. That figure includes the bookmaker's margin, so the probability the book is really working with is a little lower.