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Odds converter and margin calculator

Type odds in any one box, decimal, fractional, American or the chance in percent, and the other three follow. Below it, the margin a bookmaker keeps on a market.

Convert odds

Decimal Fractional American Chance in %

The bookmaker's margin

Type the odds of every outcome in one market. The margin is how far the prices add up above 100%.

Outcome 1 odds Outcome 2 odds Outcome 3 odds, if any

The four ways to write odds

• Decimal, 2.50: what comes back for each dollar staked, the stake included. Most crypto sportsbooks show this.
• Fractional, 3/2: the profit for each unit staked, without the stake. 3/2 is the same price as 2.50.
• American, +150: a plus sign gives the profit on a $100 stake, a minus sign the stake you need to win $100. +150 is 2.50, and -200 is 1.50.
• The chance, 40%: one divided by the decimal odds. It includes the margin, so the true chance is a little lower.

The sportsbook at WePlay and how combos work are on the sportsbook corner.

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