How Do We Convert One Odds Format To Another

To Convert One Odds Format To Another, we first need to convert any odds format to their implied probability. Once we have done this, the calculations are fairly straight forward.
  • Converting Implied Probability Into Decimal Odds.
Implied probability: 75%
Decimal odds = 100 / 75 = 1.33
  • Converting Implied Probability Into Fractional Odds
Implied probability: 25%
Fractional odds = ((100 / 25) – 1) = 4 - 1 = 3

Fractional odds is expressed as 3 to 1.
  • Converting Implied Probability Into American Odds: This depends on whether the implied probability is above 50% or below.
If the implied probability is above 50%, we make the following calculation.

Implied probability: 75%.
American odds = - (probability)/(100 – probability) * 100 = - (75 / (100 – 75)) * 100 = - (75 / 25) * 100 = - 3 * 100

American odds = - 300.

If the implied probability is below 50%, we make the following calculation.

Implied probability: 25%.
American odds = ((100 - probability)/(probability) * 100) = ((75) / (25) * 100) = 3 * 100

American odds = + 300

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