Sports Betting - Odds Tutorial


Odds Format

Odds for different outcomes are presented either in European format (decimal odds), UK format (fractional odds), or American format (moneyline odds).

  • European format (decimal odds) are favored in continental Europe, Canada, and Australia. They are the ratio of the full payout to the stake, in a decimal format. Decimal odds of 2.00 are an even bet.

  • UK format (fractional odds) are favored by British bookmakers. They are the ratio of the amount won to the stake. Fractional odds of 1/1 are an even bet.

  • US format odds are favored in the United States. They are 'the amount won on a 100 stake' when positive and 'the stake needed to win 100' when negative. US odds of 100 are an even bet.

Odds Formats

Decimal Fraction US
1.50 1/2 -200
2.00 1/1 +100
2.50 3/2 +150
3.00 2/1 +200

Odds Conversion

From To Formula
Decimal Fractional x-1 , then convert to fraction
Decimal US 100*(x-1) if x>=2; -100/(x-1) if x<2
Fractional Decimal divide fraction, then x+1
Fractional US divide fraction, then 100*x if x>=1; -100/x if x<1
US Decimal (x/100)+1 if x>0; (-100/x)+1 if x<0
US Fractional x/100, then convert to fraction if x>0; -100/x, then convert to fraction if x<0

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EricBurkholz01 on March 1, 2019

Sports Betting - Odds Tutorial

HPG ADMIN on March 1, 2013