Type in any of the three formats — American, decimal, or fractional — and the other two update instantly, along with the implied probability. Last updated: May 2026.
American (or "moneyline") odds use + and − numbers around 100. +150 means a $100 bet wins $150 profit. −150 means you risk $150 to win $100 profit. The favorite is always the negative number.
Decimal odds (used in Europe and most online sportsbooks) show your total return per $1 staked. Decimal 2.50 means a $1 bet returns $2.50 total ($1.50 profit + $1 stake).
Fractional odds (popular in the UK) show profit-to-stake. 5/2 means a $2 bet wins $5 profit. To convert to decimal, divide and add 1: 5/2 = 2.5 + 1 = 3.50.
Implied probability is simply 1 ÷ decimal odds, expressed as a percent. Decimal 2.00 → 50%. Decimal 1.50 → 66.67%. This is the win rate you'd need to break even at those odds.
That's the sportsbook's vig (juice). The "extra" probability above 100% is the margin the house keeps. Sharper books have tighter margins (2-4%), softer books 5-8% or more.