How do I convert American odds to decimal odds?

For positive American odds, divide by 100 and add 1 (e.g. +150 → 150/100 + 1 = 2.50). For negative odds, divide 100 by the absolute value and add 1 (e.g. -110 → 100/110 + 1 = 1.91). This converter does it instantly in both directions.

What is implied probability?

Implied probability is the chance of an outcome baked into the odds, expressed as a percentage. American -110 implies about 52.4%. It includes the sportsbook’s margin (the vig), so the implied probabilities of both sides of a market add up to more than 100%.

How do I read fractional odds like 10/11?

Fractional odds show net profit per unit staked. 10/11 means you win 10 for every 11 risked; 3/2 means you win 3 for every 2 risked. Add 1 to the fraction to get the decimal payout per unit (3/2 → 2.50).

What does -110 mean in betting?

-110 is the standard price on a point spread or two-way market. You stake 110 to win 100, which equals 1.91 in decimal odds, 10/11 fractional, and an implied probability of about 52.4%.

Free tool

Odds converter

Type any format and the rest update live. American, decimal, fractional, and implied probability — plus the payout on your stake.

American

Decimal

Fractional

Implied probability (%)

Stake ($)

Total payout $190.91

To win (profit) $90.91

How odds formats relate

American, decimal, and fractional odds are three ways of writing the same thing: the price of a bet. Decimal odds are the cleanest to work with — multiply your stake by the decimal to get your total return. American odds are the US standard, where a negative number is the amount you risk to win 100 and a positive number is the amount you win on a 100 stake. Fractional odds, common in the UK and on horse racing, show net profit per unit staked.

Implied probability strips the format away entirely and tells you the break-even win rate the price demands. It always includes the sportsbook’s margin, which is why the two sides of a market add up to more than 100%. To compare a true edge across books — or against a prediction-market price — you need to remove that margin, which our vig & hold calculator does for you.

Frequently asked questions

How do I convert American odds to decimal odds?: For positive American odds, divide by 100 and add 1 (e.g. +150 → 150/100 + 1 = 2.50). For negative odds, divide 100 by the absolute value and add 1 (e.g. -110 → 100/110 + 1 = 1.91). This converter does it instantly in both directions.
What is implied probability?: Implied probability is the chance of an outcome baked into the odds, expressed as a percentage. American -110 implies about 52.4%. It includes the sportsbook’s margin (the vig), so the implied probabilities of both sides of a market add up to more than 100%.
How do I read fractional odds like 10/11?: Fractional odds show net profit per unit staked. 10/11 means you win 10 for every 11 risked; 3/2 means you win 3 for every 2 risked. Add 1 to the fraction to get the decimal payout per unit (3/2 → 2.50).
What does -110 mean in betting?: -110 is the standard price on a point spread or two-way market. You stake 110 to win 100, which equals 1.91 in decimal odds, 10/11 fractional, and an implied probability of about 52.4%.

For informational purposes only. Not betting or financial advice. Please gamble responsibly. 21+ where applicable.