🎲 Odds Converter

Convert between decimal, fractional, American moneyline, and implied probability. Enter any format — all others update instantly.

Enter Any Odds Format

Decimal Odds

e.g. 2.50 = even money + stake

Fractional Odds

e.g. 3/2, 5/4, 11/10

American / Moneyline

e.g. +150 (underdog) or -200 (favorite)

Implied Probability

e.g. 40% = 2.50 decimal

Invalid odds — please check your input.

Bookmaker Margin Calculator

Enter odds for both sides of a market to calculate the overround (vig/juice).

Side A — Decimal Odds

Side B — Decimal Odds

Side C — Decimal Odds (optional, for 3-way)

Common Odds Reference Table

Decimal	Fractional	American	Implied %

Odds Formats Explained

Decimal Odds

Used in: Europe, Australia, Canada

e.g. 2.50

Total return per unit staked, including stake. Profit = (odds − 1) × stake.

Fractional Odds

Used in: UK, Ireland, horse racing

e.g. 3/2

Profit/stake ratio. 3/2 means £3 profit per £2 staked. Stake returned separately.

American / Moneyline

Used in: United States

e.g. +150 or -200

+150: profit $150 on $100. −200: stake $200 to win $100. Stake returned on wins.

Implied Probability

Universal — shows true likelihood

e.g. 40%

The win probability the odds imply. Includes bookmaker margin so it exceeds 100% summed.

What Is Vig / Juice / Overround?

Bookmakers set odds so that implied probabilities across all outcomes sum to more than 100%. This excess — called vig, juice, or overround — is their built-in profit margin. A typical two-way market at −110 / −110 (American) carries ~4.5% vig. The lower the vig, the better value for bettors.

Each-Way Betting (Horse Racing) Each-way (E/W) betting is a common UK/Irish horse racing bet that is two bets in one: a Win bet and a Place bet of equal stake. If the horse wins, both bets pay out. If it places (finishes 2nd–4th depending on field size), only the Place bet pays, usually at 1/4 or 1/5 of the win odds. Total E/W stake = 2× your unit stake. This makes E/W betting useful in larger fields where a winner is hard to call but a place is likely.

Fair Value vs Bookmaker Odds

If you believe an outcome has a 50% true probability, the fair decimal odds are 2.00. A bookmaker offering 1.90 is pricing in ~5.3% vig. To have a positive expected value, your estimated probability must exceed the implied probability in the odds — this gap is called your edge.