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Betting Odds Converter

Convert decimal odds into implied probability, fractional, and American formats.

How it is calculated

Starting from decimal odds (the total return per 1 staked, stake included), the tool gives three equivalents. Implied probability: p = 1 ÷ decimal × 100. Fractional odds: the profit per unit, (decimal − 1), written as a fraction over 100 and reduced by the greatest common divisor. American (moneyline) odds: for decimal odds of 2.00 or more, +((decimal − 1) × 100), meaning profit on a 100 stake; below 2.00, −(100 ÷ (decimal − 1)), meaning the stake needed to win 100. The decimal value must be above 1. The implied probability includes the bookmaker's margin, so the probabilities of all outcomes add up to more than 100%.

Worked example

Decimal odds 2.5. Implied probability: 1 ÷ 2.5 = 0.4, so 40.00%. Fractional: 2.5 − 1 = 1.5, which is 150/100 and reduces to 3/2. American: 2.5 is at least 2.00, so (2.5 − 1) × 100 = +150. A stake of 10 returns 25 in total (10 stake plus 15 profit).

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Common mistakes

  • Taking the implied probability as the true chance of winning. It also contains the bookmaker's margin.
  • Confusing fractional 3/2 (profit of 3 per 2 staked) with decimal 3.5 or 1.5. The decimal equivalent is 2.5, because the stake is included.
  • Entering odds of 1 or below, which are rejected, or entering fractional or American odds into the decimal field.
  • Reading +150 and −150 as mirror images. +150 is 2.5 decimal, while −150 is about 1.67.

About this calculator

This tool converts decimal odds into implied probability, fractional odds, and American (moneyline) odds. Implied probability is calculated as 1/decimal odds, while fractional and American formats are simply different regional conventions for expressing the same payout.

Sports bettors use it to compare odds listed in different formats across sportsbooks based in different countries, and it helps spot which of two prices actually offers better value once both are converted to the same format.

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Comments (1)

  • Editorial team

    The implied probability includes the bookmaker's margin. In a two-way market where both sides are 1.90, each shows 52.63%, and the pair adds up to 105.26%, so the extra 5.26 points is the margin, not a real chance. Compare that total across bookmakers rather than reading one figure as the true probability. This explains the number only and is not betting advice. Which odds format do you usually start from?

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