Odds conversion is something you will hardly ever need. For most it would be sufficient to use a conversion tables.

But if you actually need to convert odds as part of a script here is how to do so:

There are three types of odds format:

**Fractional: 9/5** for every 5 dollars you invest you get 9 if you win and the original 5 stake.
**Decimal: 2.8** for every dollar you invest you get 2.8 dollars, that include the original stake.
**American: **American odds are divided to two parts positives and negatives.

Positive: **180** for every $100 you invest you win $180 and get your $100 stake back.

Negative**: -180** to win $100 you need to invest $180, so if you invest $180 and win you get $100 and the $180 stake back.

Conversion between odds is rather simple.

Given the fractional odds `numerator/denominator`

( for short: `num/den`

)

The decimal odds are computed as `decOdds = ((num+den)/den)`

The American odds are computed as follow

`if (num/den > 1 )`

usOdds = ((num/den)*100)

else

usOdds = ((den/num)*(-100))