Odds Converter

Any price.
Every format.

Type an odds price in American, decimal, or fractional form. Every other format, the implied probability, your payout, and the break-even win rate update as you type.

Enter a price — any format

American (-110), decimal (1.91), or fractional (10/11)

American

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Decimal

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Fractional

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Implied Probability

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Payout from a stake

Enter a stake to see your return.

Break-even win rate

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Win more often than this and the price is profitable long term. It's the implied probability, read as a threshold.

Comparing two books? Strip the margin first with the No-Vig Calculator to see the fair price behind the line.

01How the formats relate

All three formats describe the same thing: how much a winning bet returns. Decimal is the cleanest — it's your total return per $1 staked, so 1.91 means $1.91 back on a $1 bet. American centers on $100: a positive number is profit on a $100 stake, a negative number is what you'd risk to win $100. Fractional is profit-to-stake as a ratio, so 10/11 means win $10 for every $11 risked.

02Implied probability & break-even

Flip decimal odds and you get implied probability: 1 ÷ 1.91 ≈ 52.4%. That's the chance the price is pricing in — and it's also your break-even win rate. Hit that side more than 52.4% of the time at -110 and you profit; less, and the vig grinds you down. Every price has a number you have to beat, and this is it.

03One caveat on implied probability

The implied probability of a single posted price includes the book's margin — it's not the true probability. Add up both sides of a market and they'll exceed 100%. To get the fair, vig-free number, run the full market through a de-vig calculator. This page converts a single price; de-vigging needs both sides.

Odds converter FAQ

A +150 price is American odds for an underdog. The number tells you the profit on a $100 stake: bet $100 at +150 and you win $150, returning $250 total. Any plus number works the same way — the figure is your profit per $100 risked.

In decimal terms, +150 equals 2.50, and its implied probability is 40%.

A -110 price is American odds for a slight favorite — the standard price on a balanced two-way market. The minus number is what you must risk to win $100: at -110 you stake $110 to win $100.

That converts to 1.91 in decimal odds and an implied probability of about 52.4%, which is also the break-even win rate at that price.

For positive American odds, divide by 100 and add 1: +150 becomes (150/100) + 1 = 2.50. For negative odds, divide 100 by the absolute value and add 1: -110 becomes (100/110) + 1 = 1.91.

This converter does it instantly in both directions, plus fractional and implied probability.

Implied probability is the win rate a price is pricing in. Take 1 divided by the decimal odds: 1 / 2.50 = 40%. It's also your break-even rate — win more often than the implied probability and the bet profits over time.

One caveat: a single posted price includes the book's vig, so its implied probability is slightly inflated. To get the true number, run the market through the no-vig calculator.

Decimal odds show your total return per $1 staked, so 2.50 means $2.50 back including your dollar. Fractional odds show profit-to-stake as a ratio, so 6/4 means win $6 for every $4 risked. They describe the same price in different formats — common in different regions and sports.