What does −110 mean?

You risk $110 to win $100. Its implied probability is 52.38%, which is the break-even win rate at that price.

Why do −100 and +100 mean the same thing?

Both are even money: decimal 2.00, fractional 1/1, implied probability 50%.

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Convert American, decimal and fractional odds and see the implied probability of any price. Plus-money and minus-money odds are both supported.

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Odds (american)

Use a minus sign for favourites (−110) and plus or nothing for underdogs (+150).

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How this works

American → decimal: +A → 1 + A/100 · −A → 1 + 100/A. Decimal → American: D ≥ 2 → +(D − 1) × 100 · D < 2 → −100 / (D − 1).

Implied probability = 1 / decimal odds. Example: −110 → 1.9091 decimal → 52.38%. +150 → 2.50 → 40.00%.

Fractional odds are profit ÷ stake (decimal − 1), reduced to lowest terms (−110 → 10/11). When the exact fraction would be awkward, the nearest familiar fraction within 0.5% is shown and marked ≈.

Implied probability from a single price still contains the sportsbook's margin. Use the No-Vig tool to remove it.

Questions

What does −110 mean?: You risk $110 to win $100. Its implied probability is 52.38%, which is the break-even win rate at that price.
Why do −100 and +100 mean the same thing?: Both are even money: decimal 2.00, fractional 1/1, implied probability 50%.

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