Fractional = 2/1 (IE a winning bet of 1$ returns 2$, for a profit of 1$)
Decimal = 1.85 (IE a winning bet of 1$ returns 1.85$ for a profit of 85 cents)
American = stupid.. -150 means you’d have to bet 250$ to win 100$, I believe.. it’s always been confusing to me and my players all use decimal.
PS: It’s retarded that many sportsbooks / websites / tools don’t even provide decimals, which all europeans use.