Odds converter: every format, one price

Type odds in American (−110, +200) or decimal (1.91) and get all four representations — including the implied probability the price is quietly asserting.

American

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Decimal

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Fractional

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Implied probability

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Type any odds format above.

Cheat sheet

American: +150 = win $150 on $100; −150 = risk $150 to win $100.
Decimal: total return per $1 staked, stake included — 2.50 pays $250 on $100.
Fractional: profit over stake — 3/2 = +150 = 2.50.
Implied probability: 1 ÷ decimal. Both sides of a real market sum past 100% — the gap is the vig, and the no-vig calculator removes it.

Frequently asked questions

How do American odds convert to decimal?

Positive odds: decimal = 1 + american/100 (+150 → 2.50). Negative: decimal = 1 + 100/|american| (-110 → 1.909). Decimal odds are the total return per $1 staked, including the stake.

What is implied probability?

1 divided by the decimal odds — the win rate the price assumes. It includes the book's margin, so both sides of a market sum past 100%; use the no-vig calculator to see the fair number.

Standard formulas on numbers you provide — not betting advice. 21+ where applicable. Gambling problem? Call 1‑800‑GAMBLER.