Converter for Multi-Format Odds

Instantly convert odds between Decimal, American, Fractional, and Implied Probability formats with two-way reactive calculation.

Odd Decimal (US / Brazil)

Odd Americana (US)

Fractional Odds (UK)

Implied Probability (%)

Analytical Equivalence:

Understanding the Odds Formats

Statistical odds are presented under different regional conventions, but all strictly represent the same implied probability of the event.

• Decimal (US): Expresses the total cumulative gross return per unit risked (Stake + Profit).
• American (US): Displays the profit amount relative to a 100-unit base (Moneyline).
• Fractional (UK): It indicates the ratio of additional profit to capital employed.

Standard Equivalence Matrix

Decimal 2.00

American +100

Fractional 1/1

Implied Probability 50.00%

Frequently Asked Questions (FAQ)

The Decimal format is the most intuitive universal betting standard, as it directly expresses the gross multiplier of the stake. The American format is widely used in the U.S. market, and the Fractional format is predominant in the U.K. market.

For positive American odds (e.g., +150), the calculation is (150 ÷ 100) + 1 = 2.50. For negative American odds (e.g., -200), use (100 ÷ |-200|) + 1 = 1.50.

The implied probability is the mathematical inverse of the decimal odds: (1 ÷ Decimal Odds) × 100. A decimal odds of 2.00 is equivalent to a 50.00% probability as estimated by the market.

To convert a fraction such as 4/5 to a decimal, divide the numerator by the denominator and add 1: (4 ÷ 5) + 1 = 1.80.

Yes. The odds are statistically equivalent. Odds of 2.00 (Decimal), +100 (American), or 1/1 (Fractional) result in exactly the same payout and implied probability (50%).