Odds Conversion

How to convert American, European and British Style odds?

We have all experienced it, we are browsing the internet looking for a favorite bookie, such as Stake.com, offering the match and market to our liking when the odds displayed are not the ones preferable. For most Europeans for example, who are used to the European decimal odds, the British fractional can cause some thankfully short lived headaches.

How to Convert American odds to European odds and vice versa

Basically, American odds are centered around winning $100. When converting American odds to European you have to divide the underdog’s price (meaning the positive odds) by 100 and add 1 or divide the favourite’s price (meaning the negative odds) into 100 (after you drop the minus sign) and add 1. To convert decimal odds of less than 2.0 to American you have to subtract 1 and divide into -100. For odds greater than 2.0, subtract 1 and multiply by 100.

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The above mentioned in practice for a match between Portugal – Spain would be like this:

  • The American odds offered for Portugal to win the match are -250 (in this case Portugal is favourite so American odds are negative). Now drop the minus sign which gives us (100 / 250) + 1 = 1.40.
  • The odds for Spain to win the match as an underdog are +400. (400 / 100) + = 5.00.

To reverse this and convert the European odds to American:

Portugal win is offered at 1.40 which is under 2.00. It would be 100 / (1.40 – 1) = 250. The odds over 2.00 for Spain to win convert as (5.00 – 1) x 100 = 400

How to Convert British odds to European odds and vice versa

British to European conversion is a bit simpler. You will just have to divide the two sides of British odds to get a fraction and add 1. Portugals victory in British odds is 2/5 which is 0.4 + 1 = 1.40. As simple as that but when reversing this conversion some minor round off errors might happen as some odds cannot be translated exactly into the British fractions.

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How to Convert British odds to American and vice versa

The American odds with a + sign simply show how much money you would make for every $100 you bet, excluding your original stake of $100. To convert into the fractional odds you simply have to divide the expected profit by 100. For example (150/100 = 1.5/1) and then multiple both sides with 10 which gives you 15/10. To see the decimal odds just add the two fractional odds together (1.5 + 1 = 2.5).