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Decimal to American Odds Converter

The moneyline price, +150 or -200 style, for a set of decimal odds.

How it is calculated

Decimal odds D are the total return per 1 unit staked, stake included, so they must be greater than 1. The tool splits at 2.00. For D ≥ 2 the American price is positive: A = (D − 1) × 100, the profit on a 100 stake. For D < 2 it is negative: A = −100 / (D − 1), the stake needed to win 100. Exactly 2.00 gives +100. The American figure is rounded to a whole number and a plus sign is added to positive values. The implied probability is 1 / D × 100, shown as a percentage. It is not adjusted for the bookmaker's margin, so the implied probabilities of all outcomes in a market add up to more than 100%.

Worked example

Take decimal odds of 1.91, a price often seen on two-way markets. Since 1.91 is below 2, use the negative formula: −100 / (1.91 − 1) = −100 / 0.91 = −109.89, which the tool rounds to -110. That means you must stake 110 to win 100 in profit. The implied probability is 1 / 1.91 = 0.5236, shown as 52.36%. For comparison, decimal 2.50 is above 2, so it gives (2.50 − 1) × 100 = +150, and the implied probability is 40.00%.

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Common mistakes

  • Treating decimal odds as profit. Decimal 2.50 includes the stake, so a 10 bet returns 25 and wins 15; the +150 American price is the profit on 100, which is consistent.
  • Entering odds of 1 or less. A decimal price of 1.00 would pay back only the stake, and the tool returns no result for anything not greater than 1.
  • Reading the implied probability as the true chance of winning. It is just 1 / odds and still contains the bookmaker's margin, so it overstates the real probability.
  • Thinking −110 means you win 110. A negative American price is the amount you must stake to win 100, so -110 wins about 90.91 on a 100 stake.
  • Expecting an exact round trip. American odds are rounded to whole numbers, so 1.91 becomes -110, which converts back to 1.9091, not 1.91.

About this calculator

Decimal odds (also called European odds) show the total payout per unit staked, including the original stake — a decimal of 2.50 means a $10 bet returns $25. American odds (moneyline) instead show either how much profit a $100 bet would make (a positive number like +150) or how much must be staked to profit $100 (a negative number like -200). The conversion splits on whether the decimal odds are above or below 2.00: for decimal odds of 2.00 or higher, American = (decimal − 1) × 100; for decimal odds below 2.00, American = −100 ÷ (decimal − 1).

Sports bettors, bookmakers, and odds-comparison sites use this conversion because different regions and platforms default to different formats — European and Asian markets typically quote decimal odds, while sportsbooks in the United States quote American odds almost exclusively. Being able to move between the two lets someone compare prices across sites or read odds from a source that only publishes one format.

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Comments (1)

  • Editorial team

    The percentage shown is the raw 1 divided by the decimal price, so it still includes the bookmaker's margin. To see that margin, convert every outcome of one market and add the implied percentages: a total above 100% is the built-in edge. American odds never fall between -100 and +100, so a price near evens jumps from about -101 to +100. Which markets do you convert most often?

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