american odds is pretty easy. +130 means you win 130 for 100 wager, and -140 means you win 100 for 140 wager.

the formula to convert it to decimal odds is for all plus money odds, you just add 100 and divide it by 100. for example, +130 will be 2.30 in decimal odds.

for minus money, the math gets a bit harder. divid it by 100, take the inverse and add 1. for example, -140 will be 1.71 in decimal pricing.

as you can see it is pretty easy to go back and forth for plus money odds, but the real question is how do you convert minus money odds in your head? (don't really want to keep my spreadsheet open everytime i want to make a bet)

does anyone know the rational behind the decimal system? i am still puzzled why 2 is the even money bet? why don't they make 1 the even money bet, so you don't have to add one when you go from american to decimal.