What is an Odds Converter?

The Odds Converter is a free sports betting tool that instantly converts between American, Decimal, Fractional, and Probability odds formats. It’s especially useful for U.S. bettors comparing lines across sportsbooks like FanDuel, DraftKings, BetMGM, or BetOnline, since different sites and tools display odds in different formats. This calculator makes it easy to translate them all into the same terms so you can identify value faster.

How do you convert between odds formats?

The Odds Converter uses standardized formulas to translate one format into another accurately. American to Other Formats: Positive American to Probability: Probability = 100 / (Odds + 100). Negative American to Probability: Probability = |Odds| / (|Odds| + 100). Positive American to Decimal: Decimal = (Odds + 100) / 100. Negative American to Decimal: Decimal = (|Odds| + 100) / |Odds|. Positive American to Fractional: Fractional = Odds / 100. Negative American to Fractional: Fractional = 100 / |Odds|. Decimal to Other Formats: Decimal to Probability: Probability = 1 / Decimal. Decimal to Positive American (if Decimal ≥ 2): American = (Decimal − 1) × 100. Decimal to Negative American (if Decimal 0.5): American = (Probability / (Probability − 1)) × 100. Probability to Positive American (if Probability ≤ 0.5): American = ((1 − Probability) / Probability) × 100. Probability to Fractional: Fractional = (1 − Probability) / Probability. Fractional to Other Formats: Fractional to Decimal: Decimal = Fractional + 1. Fractional to Probability: Probability = 1 / (Fractional + 1). Fractional to Positive American (if Fractional ≥ 1): American = Fractional × 100. Fractional to Negative American (if Fractional < 1): American = −100 / Fractional.

How does this calculator help me?

The Odds Converter Calculator helps you compare odds formats across multiple sportsbooks and betting markets. It’s perfect for evaluating line movement, breakeven probabilities, or arbitrage opportunities across sites that use different odds systems. Whether you’re a beginner learning to read moneyline odds or a sharp bettor analyzing value bets, this tool ensures you’re comparing apples to apples in your betting strategy.

Bettor Ed Odds Converter

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Frequently Asked Questions

Find answers to commonly asked questions about the Odds Converter

What is an Odds Converter?
- The Odds Converter is a free sports betting tool that instantly converts between American, Decimal, Fractional, and Probability odds formats.
- It’s especially useful for U.S. bettors comparing lines across sportsbooks like FanDuel, DraftKings, BetMGM, or BetOnline, since different sites and tools display odds in different formats. This calculator makes it easy to translate them all into the same terms so you can identify value faster.

How do you convert between odds formats?
- The Odds Converter uses standardized formulas to translate one format into another accurately:
- American to Other Formats
  - Positive American to Probability: Probability = 100 / (Odds + 100)
  - Negative American to Probability: Probability = |Odds| / (|Odds| + 100)
  - Positive American to Decimal: Decimal = (Odds + 100) / 100
  - Negative American to Decimal: Decimal = (|Odds| + 100) / |Odds|
  - Positive American to Fractional: Fractional = Odds / 100
  - Negative American to Fractional: Fractional = 100 / |Odds|
- Decimal to Other Formats
  - Decimal to Probability: Probability = 1 / Decimal
  - Decimal to Positive American (if Decimal ≥ 2): American = (Decimal − 1) × 100
  - Decimal to Negative American (if Decimal < 2): American = −100 / (Decimal − 1)
  - Decimal to Fractional: Fractional = Decimal − 1
- Probability to Other Formats
  - Probability to Decimal: Decimal = 1 / Probability
  - Probability to Negative American (if Probability > 0.5): American = (Probability / (Probability − 1)) × 100
  - Probability to Positive American (if Probability ≤ 0.5): American = ((1 − Probability) / Probability) × 100
  - Probability to Fractional: Fractional = (1 − Probability) / Probability
- Fractional to Other Formats
  - Fractional to Decimal: Decimal = Fractional + 1
  - Fractional to Probability: Probability = 1 / (Fractional + 1)
  - Fractional to Positive American (if Fractional ≥ 1): American = Fractional × 100
  - Fractional to Negative American (if Fractional < 1): American = −100 / Fractional

How does this calculator help me?
- The Odds Converter Calculator helps you compare odds formats across multiple sportsbooks and betting markets.
- It’s perfect for evaluating line movement, breakeven probabilities, or arbitrage opportunities across sites that use different odds systems.
- Whether you’re a beginner learning to read moneyline odds or a sharp bettor analyzing value bets, this tool ensures you’re comparing apples to apples in your betting strategy.