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Convert any odds — and see the true probability behind the line

American, Decimal or Fractional in, every format out — plus the implied probability the book is really quoting. Read a price in one tap before you back it.

How to convert odds in 3 steps

01

Enter the odds

Type any price — for example -110, 1.91 or 10/11.

02

Pick the format

Tell us whether you entered American, Decimal or Fractional odds.

03

Read the result

Get the equivalent in every format plus the true implied probability.

Worked example

A classic -110 line equals 1.91 decimal and 10/11 fractional. Drop it into 1 ÷ 1.91 and you get an implied probability of 52.4% — you'd stake $110 to win $100. Across both sides of a market those percentages add up to more than 100%; that excess is the book's margin.

Odds conversion — quick answers

What does -110 mean in decimal odds?

American -110 equals 1.91 in decimal odds, an implied probability of 52.4%. You'd stake $110 to win $100.

How do I work out implied probability?

Implied probability = 1 ÷ decimal odds. For 1.91 that's 1 ÷ 1.91 = 52.4%. Across both sides of a market these add up to more than 100% — the excess is the bookmaker's margin.

How do I convert fractional to decimal?

Decimal = (numerator ÷ denominator) + 1. So 10/11 = (10 ÷ 11) + 1 = 1.91.

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