Odds Converter

Odds Converter Calculator

Betting odds converter translates a betting price between American odds, fractional odds, decimal odds, and implied probability. It uses decimal odds as the common conversion format because decimal odds represent the total return multiplier for a winning bet.

The calculator also connects the odds to a bet amount. With a stake entered, it calculates potential profit on a winning bet and the total payout returned by the sportsbook. Profit excludes the original stake; payout includes the original stake.

• American odds

  American odds use a plus or minus price. Positive odds show profit on a $100 stake, such as +150 returning $150 profit. Negative odds show how much must be risked to win $100, such as -120 requiring a $120 stake to profit $100.

• Fractional odds

  Fractional odds show profit relative to stake. Odds of 3/2 mean the profit is 3 units for every 2 units staked, so a $100 winning bet profits $150 and returns $250 total.

• Decimal odds

  Decimal odds show total payout per $1 staked, including the returned stake. Decimal odds of 2.50 mean a $100 winning bet returns $250 total, with $150 profit.

• Implied probability

  Implied probability is the break-even win rate represented by the odds. It is calculated from the price and should not be treated as a true win probability or prediction.

• Bet amount

  Bet amount is the stake risked on the wager. The default is $100 so common American odds can be read quickly, but any stake can be entered.

• Profit and payout

  Profit is the net win if the bet cashes. Payout is stake plus profit. A $100 bet at decimal odds of 1.91 profits $91 and pays out $191 total.

How Odds Conversion Works

The calculator first converts the entered value into decimal odds, then uses that decimal price to fill the other fields. For positive American odds, decimal odds equal 1 + (American / 100). For negative American odds, decimal odds equal 1 + (100 / absolute American). For fractional odds, decimal odds equal 1 + (numerator / denominator).

Implied probability is calculated as 100 / decimal odds. Profit is calculated as stake * (decimal odds - 1), and payout is calculated as stake * decimal odds. These calculations show the break-even math of the listed price before considering sportsbook margin, account limits, pushes, voids, taxes, or other settlement rules.

For example, +150 American odds convert to 3/2 fractional odds, 2.50 decimal odds, and 40% implied probability. A $100 winning bet at +150 profits $150 and returns a $250 total payout.