Decimal or European format odds are pretty easy to comprehend. They are simply expressed as a decimal figure like 2.50. That number will be the ratio of your payout to your original stake. Fractional, or UK format odds are expressed as a fraction, for instance, 1/4. That will represent the ratio of your profit, not your total payout from a winning bet of your stake. US, or Moneyline format odds are somewhat more challenging to work out. US Odds are expressed with a number preceded by a plus or minus sign like -200 or +100. A minus signifies how much you need to stake to make €100. A positive means how much you win with a €100 bet.