Every odd. Every format.
One powerful tool.

Convert betting odds instantly, calculate potential returns and explore a complete conversion chart — all in one place.

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Odds converter

Enter a value in any field. The other formats update instantly.

1.5Decimal ±American ¾Fractional %Implied probability

iAbout the converter

Enter odds in any format to see their equivalents. The percentage is implied probability, not a prediction.

Surebet Calculator: Two-Way & Three-Way Arbitrage

Free surebet calculator for two-way and three-way arbitrage. Split stakes and estimate theoretical profit.

Returns & parlay calculator

Stake (any currency)

Combined decimal odds—

Potential total payout—

Potential net profit—

Implied probability—

All selections must win for a parlay payout. Estimates exclude taxes, fees, voids and operator-specific rules.

Multiply or divide odds

Operation

Result: —

Inputs are converted to decimal odds before calculation. A division result ≤ 1 is not a valid betting odd.

Manual conversion chart

Search decimal, American, fraction or percentage

Decimal	American	Fractional	Implied probability

Tap any row to load it into the converter. Fractional and American values may be rounded.

Free odds converter and betting odds calculator

Odds Universal converts decimal, American (moneyline), fractional odds and implied probability. Enter a value in any format to see the equivalent values. You can also estimate total returns, net profit and combined parlay odds. The tools are free and work in your browser.

How do you convert decimal odds to implied probability?

Divide 100 by the decimal odds. For example, decimal odds of 2.50 correspond to 40% implied probability (100 ÷ 2.50 = 40%). Implied probability is a mathematical conversion, not a forecast.

How do you calculate a potential payout?

Multiply the stake by the decimal odds to estimate the total payout, including the original stake. Net profit is the total payout minus the stake. For example, a 100-unit stake at 2.50 odds gives a 250-unit total payout and a 150-unit net profit, before fees or taxes.

How do parlay odds work?

Multiply the decimal odds of each selection. For example, 2.00 × 1.50 × 3.00 = 9.00. All selections generally need to win for the estimated combined payout, subject to the operator's rules.

Frequently asked questions

What does American +150 mean?

American +150 is equivalent to decimal 2.50, fractional 3/2 and 40% implied probability.

What does American -200 mean?

American -200 is equivalent to decimal 1.50, fractional 1/2 and approximately 66.67% implied probability.

Does Odds Universal offer betting services?

No. Odds Universal provides educational calculation tools only. It does not accept bets or provide gambling accounts.

How to convert betting odds

Decimal odds show total return per unit staked. American positive odds show profit on a 100-unit stake, while negative odds show the stake needed for a 100-unit profit. Fractional odds express net profit relative to stake. Implied probability is 100 divided by decimal odds.

Example: decimal odds of 2.50 equal American +150, fractional 3/2 and 40% implied probability.

Every odd. Every format.One powerful tool.