Odds Calculator & Converter

Understanding Different Odds Formats

Betting odds are expressed in several formats around the world, with decimal, fractional, and American (moneyline) odds being the most common. Each format presents the same information but in a different way, catering to regional preferences and traditions in gambling.

Understanding how to convert between these formats is essential for comparing odds across different bookmakers and betting markets, especially for international events or when using betting platforms from different regions.

Decimal Odds

Decimal odds (also known as European odds) represent the total return on a bet, including the initial stake. They're widely used in Europe, Australia, Canada, and New Zealand.

Example: With decimal odds of 2.50 and a $10 bet, your potential return would be $10 × 2.50 = $25, which includes your original $10 stake plus $15 profit.

Key characteristics:

• Always greater than 1.00 (where 1.00 represents getting your stake back with no profit)
• The lower the number, the more likely the outcome is predicted to be
• Easy to calculate potential returns by simple multiplication

Fractional Odds

Fractional odds (also known as British odds or UK odds) are traditionally used in the United Kingdom and Ireland, especially in horse racing and sports betting. They represent the profit relative to the stake.

Example: With fractional odds of 6/4 and a $10 bet, your profit would be $10 × (6/4) = $15, with a total return of $25 (including your stake).

Key characteristics:

• Expressed as a ratio of profit to stake (e.g., 6/4, 9/2, 11/8)
• "Odds-on" opportunities (where you stake more than your potential profit) are shown with the denominator larger than the numerator (e.g., 4/7)
• Even odds are expressed as 1/1 (often called "evens")

American Odds

American odds (also called moneyline odds) are primarily used in the United States. They can be either positive or negative numbers, indicating underdogs and favorites respectively.

Examples:

• With +150 odds and a $100 bet, your profit would be $100 × (150/100) = $150, with a total return of $250.
• With -200 odds and a $100 bet, your profit would be $100 × (100/200) = $50, with a total return of $150.

Key characteristics:

• Positive odds (e.g., +150) show how much profit you'd win on a $100 stake
• Negative odds (e.g., -200) show how much you need to stake to win $100 profit
• Even odds are expressed as +100

Converting Between Odds Formats

Decimal to Fractional

1. Subtract 1 from the decimal odds: (Decimal - 1)
2. Express the result as a fraction in its simplest form

Example: To convert decimal odds of 3.50 to fractional: 3.50 - 1 = 2.50 = 5/2 (or 5/2)

Fractional to Decimal

1. Divide the numerator by the denominator
2. Add 1 to the result

Example: To convert fractional odds of 5/2 to decimal: (5 ÷ 2) + 1 = 2.5 + 1 = 3.50

Decimal to American

1. For decimal odds greater than 2.00:
   • Subtract 1 from the decimal odds
   • Multiply by 100
   • Add a + sign to the result
2. For decimal odds less than 2.00:
   • Subtract 1 from the decimal odds
   • Divide 100 by the result
   • Add a - sign to the result

Examples:

• Decimal odds of 3.50 to American: (3.50 - 1) × 100 = +250
• Decimal odds of 1.50 to American: -100 ÷ (1.50 - 1) = -100 ÷ 0.50 = -200

Implied Probability

Implied probability is the conversion of odds into a percentage, representing the likelihood of an event happening according to the odds. It's useful for comparing odds between bookmakers and identifying value bets.

Example: Decimal odds of 3.00 have an implied probability of (1 / 3.00) × 100% = 33.33%

Understanding implied probability helps bettors identify when the bookmaker's assessment of an event's likelihood differs from their own, potentially leading to profitable betting opportunities.