Odds Converter

Type in any field — the others update instantly. Supports decimal, fractional, American (moneyline) odds and implied probability.

Type any value to convert.

Quick reference

  • Decimal → probability: 1 / decimal × 100
  • Decimal → fractional: decimal − 1 as a reduced fraction
  • Decimal → American: if decimal ≥ 2 → (decimal − 1) × 100; else −100 / (decimal − 1)

Frequently asked questions

How do I convert decimal odds to fractional?

Subtract 1 from the decimal odds and write the result as a fraction: 2.50 becomes 1.50, which is 3/2.

How do American (moneyline) odds work?

Positive odds such as +150 show the profit on a 100 stake; negative odds such as -200 show the stake needed to win 100. In decimal, +150 is 2.50 and -200 is 1.50.

What is implied probability?

Implied probability is 1 divided by the decimal odds, so 2.50 implies 40%. It still includes the bookmaker margin; use the No-Vig calculator to estimate fair probabilities.

Can the Arbworld tables show fractional or American odds?

Yes. The odds format selector above every Moneyway, Dropping Odds and Combined Score table switches between decimal, fractional and American odds.