Calculators / Odds Converter

Sports Betting Odds Converter

Use this converter to move between American, decimal, and fractional prices and see the implied win probability baked into a sportsbook number. It does not predict winners.

Formula

Plus American: decimal = 1 + american/100. Minus American: decimal = 1 + 100/|american|. Implied probability = 1 / decimal.

Worked examples

-110 American. Decimal ≈ 1.909, implied ≈ 52.38%.

+150 American. Decimal = 2.50, implied = 40%.

FAQ

What does -110 mean?

You risk $110 to win $100. The implied probability is about 52.4% before removing juice.

Is implied probability a true chance?

No. It is the book’s price including hold. Use the no-vig calculator to estimate a fair split.

Related: bet-payout no-vig vig-hold

Research tool only. Never risk money you cannot afford to lose. Help: ncpgambling.org.